:root {
  --sidebar-bg: #1f5fae;
  --sidebar-bg-deep: #174b8c;
  --sidebar-hover: #2a72cf;
  --sidebar-active: #e8f3ff;
  --sidebar-active-text: #123f70;
  --sidebar-text: #f7fbff;
  --sidebar-muted: #d8eaff;

  --bg-main: #f3f7fc;
  --bg-soft: #edf5ff;
  --surface: #ffffff;
  --surface-soft: #eaf2fb;

  --primary: #2f80ed;
  --primary-strong: #1557a6;
  --primary-dark: #124a91;
  --primary-alpha: rgba(47, 128, 237, 0.16);
  --primary-light: #79b7ff;

  --text: #17324d;
  --text-muted: #587089;
  --text-light: #f7fbff;
  --border: #d5e2ef;

  --proficient: #087f5b;
  --vague: #a86600;
  --wrong: #c63d4a;
  --neutral: #6b8197;
  --focus: #075fc2;

  /* 历史状态变量映射与 5 级掌握度色板兼容 */
  --mastered: var(--proficient);
  --mastered-dark: #065e43;
  --uncertain: var(--vague);
  --uncertain-dark: #7d4c00;
  --unfamiliar: var(--wrong);
  --unfamiliar-dark: #962832;
  --unfamiliar-alpha: rgba(198, 61, 74, 0.14);


  --proficient: #159a72;
  --vague: #d58b00;
  --wrong: #d94b55;
  --neutral: #8aa0b6;

  --shadow-card: 0 8px 24px rgba(41, 100, 170, 0.12);
  --shadow-hover: 0 12px 30px rgba(41, 100, 170, 0.18);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Aliases for workspace components */
  --workspace-bg: var(--bg-main);
  --header-bg: var(--surface);
  --card-bg: var(--surface);
  --border-light: var(--bg-soft);
  --text-subtle: var(--neutral);
  --sidebar-surface: rgba(255, 255, 255, 0.12);
  --sidebar-border: rgba(255, 255, 255, 0.15);
  --sidebar-active-gradient: linear-gradient(135deg, #78b7ff 0%, #2878e8 100%);
  --sidebar-active-shadow: 0 4px 14px rgba(40, 120, 232, 0.35);

  /* 5 级掌握度色板 */
  --lv5: var(--proficient); --lv5-dark: #0f7a5b; --lv5-alpha: rgba(21, 154, 114, 0.18);
  --lv4: #3b82f6; --lv4-dark: var(--primary-strong); --lv4-alpha: rgba(40, 120, 232, 0.18);
  --lv3: var(--vague); --lv3-dark: #b27400; --lv3-alpha: rgba(213, 139, 0, 0.18);
  --lv2: #f97316; --lv2-dark: #ea580c; --lv2-alpha: rgba(249, 115, 22, 0.18);
  --lv1: var(--wrong); --lv1-dark: #b8323c; --lv1-alpha: rgba(217, 75, 85, 0.18);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-pill: 9999px;

  --shadow-sm: 0 1px 3px rgba(41, 100, 170, 0.08);
  --shadow-md: var(--shadow-card);
  --shadow-lg: var(--shadow-hover);
}

:focus-visible {
  outline: 3px solid rgba(40, 120, 232, 0.45);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  min-height: 100vh;
  color: var(--text);
  background: var(--workspace-bg);
  overflow-x: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ===== 核心应用外壳布局 ===== */
#appShell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  width: 100%;
}

.app-layout {
  display: flex;
  min-height: 100vh;
  width: 100%;
  align-items: stretch;
}

/* 侧边栏遮罩 */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 998;
}

/* ===== 左侧明亮蓝调侧边栏 ===== */
.sidebar-left {
  width: 240px;
  flex: 0 0 240px;
  background: linear-gradient(180deg, #3d7bc7, #244e88);
  color: var(--sidebar-text);
  height: 100vh;
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  z-index: 60;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  user-select: none;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 18px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.brand-logo-badge {
  font-size: 20px;
  width: 36px;
  height: 36px;
  background: #ffffff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  color: #2878e8;
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.brand-subtitle {
  font-size: 10px;
  font-weight: 600;
  color: var(--sidebar-muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.sidebar-close-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--sidebar-text);
  font-size: 18px;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
}

.sidebar-scroll-container {
  flex: 1;
  overflow-y: auto;
  padding: 14px 12px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}

.sidebar-scroll-container::-webkit-scrollbar {
  width: 4px;
}

.sidebar-scroll-container::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
}

.nav-group {
  margin-bottom: 16px;
}

.nav-group-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--sidebar-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0 8px 6px;
}

.sidebar-left .sol-default-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--sidebar-text);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.16s ease;
  text-align: left;
  margin-top: 3px;
  position: relative;
}

.sidebar-left .sol-default-btn:hover {
  background: var(--sidebar-hover);
  color: #ffffff;
  transform: none;
}

.sidebar-left .sol-default-btn.active {
  background: var(--sidebar-active);
  color: var(--sidebar-active-text);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  font-weight: 700;
}

.sidebar-left .sol-default-btn .nav-icon {
  font-size: 15px;
  flex-shrink: 0;
}

.sidebar-left .sol-default-btn .nav-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-left .sol-default-btn .sol-key {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.15);
  color: var(--sidebar-muted);
  margin-left: auto;
  font-family: monospace;
}

.sidebar-left .sol-default-btn.active .sol-key {
  background: rgba(23, 50, 77, 0.15);
  color: #17324d;
}

/* 侧边栏状态筛选 */
.filter-toolbar {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 10px;
  margin-top: 6px;
}

.filter-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  padding: 0 4px;
}

.filter-head .filter-label {
  font-size: 11px;
  font-weight: 700;
  color: #ffffff;
}

.filter-head .filter-hint {
  font-size: 10px;
  color: var(--sidebar-muted);
}

.filter-btn-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.filter-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--sidebar-text);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-btn:hover {
  background: var(--sidebar-hover);
  color: #ffffff;
}

.filter-btn.active {
  background: var(--sidebar-active);
  color: var(--sidebar-active-text) !important;
  font-weight: 700;
}

.filter-btn .filter-count {
  margin-left: auto;
  font-size: 11px;
  opacity: 0.95;
  background: rgba(255, 255, 255, 0.2);
  padding: 1px 6px;
  border-radius: 10px;
}

.filter-btn.active .filter-count {
  background: #ffffff;
  color: #17324d;
}

.filter-btn .filter-key {
  font-size: 10px;
  padding: 1px 4px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.15);
  color: var(--sidebar-muted);
  margin-left: 4px;
  font-family: monospace;
}

.filter-btn.active .filter-key {
  background: rgba(23, 50, 77, 0.15);
  color: #17324d;
}

.f-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-all { background: #94a3b8; }
.dot-proficient { background: var(--lv5); }
.dot-vague { background: var(--lv3); }
.dot-wrong { background: var(--lv1); }
.dot-notes { background: #a855f7; }

/* 导出区 */
.export-section {
  background: var(--sidebar-surface);
  border-radius: var(--radius-md);
  padding: 10px;
  margin-top: 4px;
  margin-bottom: 6px;
}

.export-section .export-label {
  font-size: 11px;
  font-weight: 700;
  color: #94a3b8;
  margin-bottom: 8px;
  padding: 0 4px;
}

.export-btn-row {
  display: flex;
  gap: 6px;
}

.export-btn {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--sidebar-text);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}

.export-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #f8fafc;
}

/* ===== 浅灰蓝现代学习工作台 ===== */
.app-workbench {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--workspace-bg);
  min-height: 100vh;
}

.workbench-body {
  flex: 1;
  display: flex;
  gap: 24px;
  padding: 20px 28px 40px;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
  align-items: flex-start;
}

.main-content {
  flex: 1;
  min-width: 0;
}

.sidebar-right {
  width: 268px;
  flex: 0 0 268px;
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(0,0,0,0.15) transparent;
}

.sidebar-right::-webkit-scrollbar {
  width: 4px;
}
.sidebar-right::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar-right::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.15);
  border-radius: 2px;
}
.sidebar-right::-webkit-scrollbar-thumb:hover {
  background: rgba(0,0,0,0.35);
}

.main-area {
  background: var(--card-bg);
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  padding: 24px;
  min-height: 520px;
}

    /* ===== 凝胶胶囊按钮通用 ===== */
    .gel-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 20px;
      border: none;
      border-radius: var(--radius-pill);
      cursor: pointer;
      font-size: 14px;
      font-weight: 500;
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
      box-shadow: var(--shadow-md),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
      transition: all 0.2s ease;
      color: var(--text);
    }

    .gel-btn:hover {
      background: linear-gradient(180deg, var(--gel-hov-top) 0%, var(--gel-hov-bot) 100%);
      box-shadow: var(--shadow-lg),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
      transform: translateY(-1px);
    }

    .gel-btn:active {
      transform: translateY(0);
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08),
        inset 0 1px 2px rgba(0, 0, 0, 0.1);
    }

    .gel-btn:disabled {
      background: linear-gradient(180deg, #f5f5f5 0%, #e8e8e8 100%);
      color: #ccc;
      cursor: not-allowed;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    }

    .gel-btn:disabled:hover {
      transform: none;
    }

    .gel-btn .func-name {
      color: var(--primary);
      font-weight: 600;
    }

    .gel-btn .key {
      color: #9CA3AF;
      font-size: 12px;
    }

    /* 解析按钮 */
    .gel-btn.btn-toggle .func-name {
      color: var(--primary-light);
    }

    .gel-btn.btn-toggle .key {
      color: #c9a3d1;
    }

    .gel-btn.btn-toggle:hover {
      background: linear-gradient(180deg, var(--primary-light) 0%, var(--primary) 100%);
    }

    .gel-btn.btn-toggle:hover .func-name {
      color: #fff;
    }

    .gel-btn.btn-toggle:hover .key {
      color: rgba(255, 255, 255, 0.7);
    }

    .gel-btn.btn-toggle.hide {
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
    }

    .gel-btn.btn-toggle.hide .func-name {
      color: #999;
    }

    .gel-btn.btn-toggle.hide .key {
      color: #ccc;
    }

    .gel-btn.btn-toggle.hide:hover {
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
    }

    /* 掌握度按钮（5 级） */
    .gel-btn.btn-status { min-width: 56px; }

    .gel-btn.btn-status[data-status="proficient"] .func-name { color: var(--lv5); }
    .gel-btn.btn-status[data-status="familiar"]   .func-name { color: var(--lv4); }
    .gel-btn.btn-status[data-status="vague"]      .func-name { color: var(--lv3); }
    .gel-btn.btn-status[data-status="rusty"]      .func-name { color: var(--lv2); }
    .gel-btn.btn-status[data-status="wrong"]      .func-name { color: var(--lv1); }

    .gel-btn.btn-status .key { color: #b0b0b0; }

    .gel-btn.btn-status.proficient,
    .gel-btn.btn-status.familiar,
    .gel-btn.btn-status.vague,
    .gel-btn.btn-status.rusty,
    .gel-btn.btn-status.wrong { color: #fff; }
    .gel-btn.btn-status.proficient .func-name,
    .gel-btn.btn-status.familiar .func-name,
    .gel-btn.btn-status.vague .func-name,
    .gel-btn.btn-status.rusty .func-name,
    .gel-btn.btn-status.wrong .func-name { color: #fff; }
    .gel-btn.btn-status.proficient .key,
    .gel-btn.btn-status.familiar .key,
    .gel-btn.btn-status.vague .key,
    .gel-btn.btn-status.rusty .key,
    .gel-btn.btn-status.wrong .key { color: rgba(255,255,255,0.7); }

    .gel-btn.btn-status.proficient { background: linear-gradient(180deg, var(--lv5) 0%, var(--lv5-dark) 100%); box-shadow: 0 2px 8px var(--lv5-alpha), inset 0 1px 0 rgba(255,255,255,0.35); }
    .gel-btn.btn-status.familiar   { background: linear-gradient(180deg, var(--lv4) 0%, var(--lv4-dark) 100%); box-shadow: 0 2px 8px var(--lv4-alpha), inset 0 1px 0 rgba(255,255,255,0.35); }
    .gel-btn.btn-status.vague      { background: linear-gradient(180deg, var(--lv3) 0%, var(--lv3-dark) 100%); box-shadow: 0 2px 8px var(--lv3-alpha), inset 0 1px 0 rgba(255,255,255,0.35); }
    .gel-btn.btn-status.rusty      { background: linear-gradient(180deg, var(--lv2) 0%, var(--lv2-dark) 100%); box-shadow: 0 2px 8px var(--lv2-alpha), inset 0 1px 0 rgba(255,255,255,0.35); }
    .gel-btn.btn-status.wrong      { background: linear-gradient(180deg, var(--lv1) 0%, var(--lv1-dark) 100%); box-shadow: 0 2px 8px var(--lv1-alpha), inset 0 1px 0 rgba(255,255,255,0.35); }

    .gel-btn.btn-status.active {
      box-shadow: 0 0 0 2px var(--primary-alpha), 0 2px 8px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.35);
    }



    /* ===== 进度统计 ===== */
    #statsBlock {
      position: relative;
      margin-bottom: 12px;
      background: rgba(255, 255, 255, 0.55);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: 12px;
      padding: 12px;
      border: 1px solid rgba(255, 255, 255, 0.45);
    }

    #statsBlock .chapter-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 4px;
      font-weight: bold;
    }

    /* ===== 解析默认开关（左侧栏） ===== */
    .sol-default-btn {
      width: 100%;
      padding: 8px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-pill);
      cursor: pointer;
      font-size: 14px;
      font-weight: 500;
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.7);
      transition: all 0.2s ease;
      color: #555;
      text-align: center;
      margin-top: 6px;
      white-space: nowrap;
    }

    .sol-default-btn:hover {
      transform: translateY(-1px);
      box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    }

    .sol-default-btn .sol-key {
      display: block;
      font-size: 11px;
      color: #aaa;
      margin-top: 2px;
    }

    /* ===== 筛选工具栏（左侧栏） ===== */
    .filter-toolbar {
      display: flex;
      flex-direction: column;
      gap: 6px;
      background: rgba(255, 255, 255, 0.6);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: 12px;
      padding: 12px;
      border: 1px solid rgba(255, 255, 255, 0.5);
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
    }

    .filter-toolbar .filter-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 4px;
      font-weight: bold;
    }

    .filter-btn {
      padding: 8px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-pill);
      cursor: pointer;
      font-size: 14px;
      font-weight: 500;
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.7);
      transition: all 0.2s ease;
      color: #555;
      text-align: center;
      white-space: nowrap;
    }

    .filter-btn .filter-key {
      display: block;
      font-size: 11px;
      color: #aaa;
      margin-top: 2px;
    }

    .filter-btn:hover {
      transform: translateY(-1px);
      box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    }

    .filter-btn.active {
      background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #fff;
      border-color: var(--primary);
      box-shadow: 0 2px 8px rgba(47, 128, 237, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
      font-weight: bold;
    }

    .filter-btn.active .filter-key {
      color: rgba(255, 255, 255, 0.7);
    }

    /* 各筛选按钮独立颜色（5 级掌握度 + 带笔记灰） */
    .filter-btn[data-filter="proficient"].active {
      background: linear-gradient(180deg, var(--lv5) 0%, var(--lv5-dark) 100%);
      border-color: var(--lv5);
      box-shadow: 0 2px 8px var(--lv5-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .filter-btn[data-filter="familiar"].active {
      background: linear-gradient(180deg, var(--lv4) 0%, var(--lv4-dark) 100%);
      border-color: var(--lv4);
      box-shadow: 0 2px 8px var(--lv4-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .filter-btn[data-filter="vague"].active {
      background: linear-gradient(180deg, var(--lv3) 0%, var(--lv3-dark) 100%);
      border-color: var(--lv3);
      box-shadow: 0 2px 8px var(--lv3-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .filter-btn[data-filter="rusty"].active {
      background: linear-gradient(180deg, var(--lv2) 0%, var(--lv2-dark) 100%);
      border-color: var(--lv2);
      box-shadow: 0 2px 8px var(--lv2-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .filter-btn[data-filter="wrong"].active {
      background: linear-gradient(180deg, var(--lv1) 0%, var(--lv1-dark) 100%);
      border-color: var(--lv1);
      box-shadow: 0 2px 8px var(--lv1-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }

    .filter-btn[data-filter="unmarked"].active {
      background: linear-gradient(180deg, #888 0%, #666 100%);
      border-color: #777;
      box-shadow: 0 2px 8px rgba(136, 136, 136, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
    }

    .filter-btn .filter-count {
      font-size: 12px;
      margin-left: 3px;
      opacity: 0.65;
    }

    .filter-btn.active .filter-count {
      opacity: 1;
    }

    /* ===== 导出按钮 ===== */
    .export-section {
      display: flex;
      flex-direction: column;
      gap: 6px;
      margin-top: 12px;
      background: rgba(255, 255, 255, 0.5);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: 12px;
      padding: 12px;
      border: 1px solid rgba(255, 255, 255, 0.45);
    }

    .export-section .export-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 4px;
      font-weight: bold;
    }

    .export-btn {
      padding: 8px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-pill);
      cursor: pointer;
      font-size: 14px;
      font-weight: 500;
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.7);
      transition: all 0.2s ease;
      color: #555;
    }

    .export-btn:hover {
      transform: translateY(-1px);
      box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    }

    .export-btn.btn-export-vague {
      color: var(--uncertain-dark);
    }

    .export-btn.btn-export-vague:hover {
      background: linear-gradient(180deg, var(--uncertain) 0%, var(--uncertain-dark) 100%);
      color: #fff;
    }

    .export-btn.btn-export-wrong {
      color: var(--unfamiliar);
    }

    .export-btn.btn-export-wrong:hover {
      background: linear-gradient(180deg, var(--unfamiliar-dark) 0%, var(--unfamiliar) 100%);
      color: #fff;
    }

    /* ===== 章节标题 ===== */
    .chapter-title {
      font-size: 22px;
      font-weight: bold;
      color: var(--text);
      text-align: center;
      flex: 1;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    /* ===== 章节标题栏（三级面板式下拉） ===== */
    .chapter-title-bar {
      position: relative;
      margin: 2px 0 16px;
      color: #303342;
      font-weight: bold;
      font-size: clamp(19px, 2vw, 24px);
      line-height: 1.4;
      letter-spacing: 0.02em;
      text-align: center;
      display: flex;
      align-items: baseline;
      justify-content: center;
      flex-wrap: wrap;
      gap: 0;
    }

    .title-dropdown {
      position: relative;
      display: inline-flex;
      flex: 0 0 auto;
    }

    .title-trigger {
      font-family: inherit;
      font-size: inherit;
      font-weight: inherit;
      line-height: inherit;
      color: inherit;
      letter-spacing: inherit;
      border: none;
      border-radius: 0;
      background: transparent;
      cursor: pointer;
      padding: 0;
      margin: 0;
      text-align: left;
      transition: color 0.18s ease, border-color 0.18s ease;
      border-bottom: 1.5px solid transparent;
      white-space: nowrap;
      display: inline-flex;
      align-items: baseline;
      gap: 2px;
    }

    .title-trigger:hover {
      color: var(--primary);
      border-bottom-color: rgba(47, 128, 237, 0.3);
    }

    .title-trigger .title-arrow {
      font-size: 0.45em;
      transition: transform 0.2s ease;
      line-height: 1;
    }

    .title-trigger.open .title-arrow {
      transform: rotate(180deg);
    }

    .title-panel {
      display: none;
      position: absolute;
      top: calc(100% + 6px);
      left: 0;
      min-width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.45);
      box-shadow: 0 14px 34px rgba(61, 67, 99, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.78);
      padding: 6px;
      z-index: 110;
      opacity: 0;
      transform: translateY(-4px);
      pointer-events: none;
      transition: opacity 0.2s ease, transform 0.2s ease;
      max-height: 320px;
      overflow-y: auto;
    }

    .title-panel.open {
      display: block;
      opacity: 1;
      transform: translateY(0);
      pointer-events: auto;
    }

    .title-panel .title-option {
      display: block;
      width: 100%;
      padding: 8px 14px;
      font-size: 13px;
      font-family: "Microsoft YaHei", sans-serif;
      font-weight: 500;
      text-align: left;
      cursor: pointer;
      border: none;
      border-radius: var(--radius-pill);
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.8);
      color: var(--text);
      transition: all 0.2s ease;
      margin-bottom: 2px;
      white-space: nowrap;
    }

    .title-panel .title-option:last-child {
      margin-bottom: 0;
    }

    .title-panel .title-option:hover {
      background: linear-gradient(180deg, var(--gel-hov-top) 0%, var(--gel-hov-bot) 100%);
      box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.9);
      transform: translateY(-1px);
    }

    .title-panel .title-option.active {
      background: linear-gradient(145deg, var(--primary-light), var(--primary-dark));
      color: #fff;
      box-shadow: 0 7px 16px rgba(21, 87, 166, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.28);
    }

    /* ===== 全局仪表盘（环形热力图） ===== */
    .dashboard-panel {
      display: flex;
      flex-direction: column;
      gap: 12px;
      overflow-y: auto;
      flex: 1;
      padding: 4px;
      min-width: 0;
      max-width: 100%;
      width: 100%;
      box-sizing: border-box;
    }
    .db-overview {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
      min-width: 0;
      max-width: 100%;
      width: 100%;
      box-sizing: border-box;
    }
    .db-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      width: 100%;
    }
    .db-donut-card {
      background: rgba(255, 255, 255, 0.65);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: 14px;
      padding: 12px;
      border: 1px solid rgba(255, 255, 255, 0.6);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
      display: flex;
      flex-direction: column;
      align-items: center;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .db-donut-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(47, 128, 237, 0.15);
    }
    .db-donut-card canvas {
      display: block;
      width: 100%;
      max-width: 280px;
      height: auto;
    }
    .db-detail {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .db-back-btn {
      align-self: flex-start;
      background: rgba(255, 255, 255, 0.65);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.6);
      border-radius: var(--radius-pill);
      padding: 3px 10px;
      font-size: 0.8em;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      transition: background 0.2s;
    }
    .db-back-btn:hover {
      background: rgba(47, 128, 237, 0.08);
    }
    .wb-back-btn {
      position: absolute;
      left: 0; /* JS 动态对齐下方图片区左缘 */
      top: 50%;
      transform: translateY(-50%);
      padding: 3px 10px;
      font-size: 0.8em;
      border-radius: var(--radius-pill);
      z-index: 5;
    }
    .db-detail-title {
      font-weight: 700;
      font-size: 1.1em;
      color: var(--primary);
    }
    .db-subject-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
      align-items: start;
    }
    .db-subject-col {
      display: flex;
      flex-direction: column;
      gap: 10px;
      min-width: 0;
      max-height: calc(100vh - 250px);
      overflow-y: auto;
      padding: 2px 6px 6px 2px;
    }
    .db-subject-header {
      position: sticky;
      top: 0;
      z-index: 1;
      flex: 0 0 auto;
      font-weight: 700;
      font-size: 1.02em;
      color: var(--primary);
      padding: 6px 8px;
      border-bottom: 2px solid rgba(47, 128, 237, 0.16);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(6px);
      -webkit-backdrop-filter: blur(6px);
      border-radius: 6px 6px 0 0;
    }
    .db-subject-count {
      font-weight: 400;
      font-size: 0.82em;
      color: #8b8f9d;
    }
    .db-subject-subheader {
      flex: 0 0 auto;
      font-size: 0.84em;
      font-weight: 600;
      color: #8b8f9d;
      margin: 2px 0 -2px;
      padding: 3px 4px;
    }
    @media (max-width: 900px) {
      .db-subject-grid {
        grid-template-columns: 1fr;
      }
    }
    .db-chapter-card {
      background: rgba(255, 255, 255, 0.65);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: 10px;
      padding: 12px 16px;
      border: 1px solid rgba(255, 255, 255, 0.6);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      cursor: pointer;
      transition: background 0.2s;
    }
    .db-chapter-card:hover {
      background: rgba(47, 128, 237, 0.05);
    }
    .db-chapter-name {
      font-weight: 600;
      font-size: 0.92em;
      margin-bottom: 8px;
      color: var(--text);
    }
    .db-chapter-bar {
      height: 6px;
      background: #e8e9f0;
      border-radius: 3px;
      margin-bottom: 6px;
      overflow: hidden;
    }
    .db-chapter-fill {
      height: 100%;
      background: var(--primary);
      border-radius: 3px;
      transition: width 0.3s;
    }
    .db-chapter-stats {
      display: flex;
      gap: 12px;
      font-size: 0.78em;
    }
    .db-stat {
      display: flex;
      align-items: center;
      gap: 3px;
    }
    .db-stat-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
    }
    /* ===== 错题本 ===== */
    .wrongbook-panel {
      display: flex;
      flex-direction: column;
      gap: 12px;
      overflow-y: auto;
      flex: 1;
    }
    .wrongbook-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      overflow-y: auto;
    }
    .wrongbook-chapter-card {
      background: rgba(255, 255, 255, 0.65);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: 10px;
      padding: 14px 12px;
      border: 1px solid rgba(255, 255, 255, 0.6);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    }
    .wrongbook-chapter-name {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      font-weight: 600;
      font-size: 0.95em;
      margin-bottom: 10px;
      color: var(--text);
    }
    .wrongbook-status-count { display: inline-flex; gap: 6px; flex: 0 0 auto; }
    .wrongbook-status-count .ws {
      font-size: 0.72em;
      font-weight: 600;
      color: #fff;
      border-radius: var(--radius-pill);
      padding: 2px 8px;
      border: 1px solid transparent;
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .ws.w-wrong {
      background: linear-gradient(180deg, var(--unfamiliar) 0%, var(--unfamiliar-dark) 100%);
      border-color: var(--unfamiliar-dark);
    }
    .ws.w-vague {
      background: linear-gradient(180deg, var(--uncertain) 0%, var(--uncertain-dark) 100%);
      border-color: var(--uncertain-dark);
    }
    .ws.w-rusty {
      background: linear-gradient(180deg, var(--lv2) 0%, var(--lv2-dark) 100%);
      border-color: var(--lv2-dark);
    }
    .ws.w-familiar {
      background: linear-gradient(180deg, var(--lv4) 0%, var(--lv4-dark) 100%);
      border-color: var(--lv4-dark);
    }
    .wrongbook-q-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr)); /* 每行 5 个 */
      gap: 4px;
    }
    .wrongbook-q-item {
      display: flex;
      align-items: center;
      justify-content: center;
      min-width: 0;
      min-height: 28px;
      padding: 2px 4px;
      border: 1px solid var(--unfamiliar-dark);
      border-radius: var(--radius-pill);
      background: linear-gradient(180deg, var(--unfamiliar) 0%, var(--unfamiliar-dark) 100%);
      color: #fff;
      font-size: 11px;
      font-weight: 600;
      box-shadow: 0 1px 4px rgba(255, 59, 48, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.3);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      cursor: pointer;
      transition: all 0.15s;
    }
    .wrongbook-q-item:hover {
      transform: translateY(-1px);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .wrongbook-q-item.vague {
      background: linear-gradient(180deg, var(--uncertain) 0%, var(--uncertain-dark) 100%);
      border-color: var(--uncertain-dark);
      box-shadow: 0 1px 4px rgba(255, 149, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    /* 错题本里 1000题 题目的角标 */
    .wrongbook-q-item .q1000-tag {
      font-size: 0.72em;
      font-weight: 600;
      color: #fff;
      background: rgba(0, 0, 0, 0.28);
      border-radius: var(--radius-pill);
      padding: 0 3px;
      margin-left: 3px;
    }
    .wrongbook-empty {
      text-align: center;
      color: var(--text-light);
      font-size: 0.95em;
      padding: 40px 0;
    }

    /* ===== 进度统计（右侧栏） ===== */
    .stats-panel {
      width: 100%;
    }

    .stats-bar-wrap {
      height: 10px;
      background: #e8e9f0;
      border-radius: 5px;
      overflow: hidden;
      margin-bottom: 6px;
    }

    .stats-bar-fill {
      height: 100%;
      border-radius: 5px;
      background: linear-gradient(90deg, var(--lv1) 0%, var(--lv2) 20%, var(--lv3) 50%, var(--lv4) 75%, var(--lv5) 100%);
      transition: width 0.4s ease;
    }

    .stats-counts {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3px 10px;
      font-size: 11px;
      color: #777;
    }

    .stats-counts span {
      display: flex;
      align-items: center;
      gap: 3px;
    }

    .stats-counts .sc-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      display: inline-block;
    }

    /* 合并章节（1000题并入）的按书分段统计块 */
    .stats-seg {
      padding: 6px 0;
    }
    .stats-seg + .stats-seg {
      border-top: 1px dashed #e2e3ea;
      margin-top: 6px;
    }
    .stats-seg-label {
      font-size: 11px;
      color: var(--text-muted);
      margin-bottom: 3px;
      font-weight: 600;
    }

    /* ===== 题号网格（右侧栏） ===== */
    .qnav-label {
      font-size: 13px;
      color: var(--text-muted);
      margin: 8px 0 4px;
      font-weight: bold;
    }

    .qnav {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 4px;
      max-width: 260px;
      margin: 8px auto 4px auto;
    }

    .qnav button {
      min-height: 28px;
      padding: 2px 1px;
      border: 1px solid var(--border);
      border-radius: var(--radius-pill);
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
      cursor: pointer;
      font-size: 12px;
      color: #555;
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.7);
      transition: all 0.15s;
      display: flex;
      align-items: center;
      justify-content: center;
      min-width: 22px;
      position: relative;
    }

    .qnav button:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-1px);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    }

    .qnav button.filtered-out {
      pointer-events: none;
    }

    .qnav button.proficient {
      background: linear-gradient(180deg, var(--lv5) 0%, var(--lv5-dark) 100%);
      color: #fff; border-color: var(--lv5-dark);
      box-shadow: 0 1px 4px var(--lv5-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .qnav button.familiar {
      background: linear-gradient(180deg, var(--lv4) 0%, var(--lv4-dark) 100%);
      color: #fff; border-color: var(--lv4-dark);
      box-shadow: 0 1px 4px var(--lv4-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .qnav button.vague {
      background: linear-gradient(180deg, var(--lv3) 0%, var(--lv3-dark) 100%);
      color: #fff; border-color: var(--lv3-dark);
      box-shadow: 0 1px 4px var(--lv3-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .qnav button.rusty {
      background: linear-gradient(180deg, var(--lv2) 0%, var(--lv2-dark) 100%);
      color: #fff; border-color: var(--lv2-dark);
      box-shadow: 0 1px 4px var(--lv2-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }
    .qnav button.wrong {
      background: linear-gradient(180deg, var(--lv1) 0%, var(--lv1-dark) 100%);
      color: #fff; border-color: var(--lv1-dark);
      box-shadow: 0 1px 4px var(--lv1-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }

    .qnav button.active {
      background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%) !important;
      color: #fff !important;
      border-color: var(--primary);
      font-weight: bold;
      box-shadow: 0 2px 8px rgba(47, 128, 237, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25);
    }

    /* 带掌握度颜色的题号按钮 hover 时保持状态色 */
    .qnav button.proficient:hover { background: linear-gradient(180deg, var(--lv5) 0%, var(--lv5-dark) 100%) !important; color: #fff !important; border-color: var(--lv5-dark); }
    .qnav button.familiar:hover   { background: linear-gradient(180deg, var(--lv4) 0%, var(--lv4-dark) 100%) !important; color: #fff !important; border-color: var(--lv4-dark); }
    .qnav button.vague:hover      { background: linear-gradient(180deg, var(--lv3) 0%, var(--lv3-dark) 100%) !important; color: #fff !important; border-color: var(--lv3-dark); }
    .qnav button.rusty:hover      { background: linear-gradient(180deg, var(--lv2) 0%, var(--lv2-dark) 100%) !important; color: #fff !important; border-color: var(--lv2-dark); }
    .qnav button.wrong:hover      { background: linear-gradient(180deg, var(--lv1) 0%, var(--lv1-dark) 100%) !important; color: #fff !important; border-color: var(--lv1-dark); }

    /* 分块按钮（有子题的题组） */
    .qnav button.has-subs {
      position: relative;
      overflow: hidden;
    }

    .qnav button .sub-bar {
      position: absolute;
      top: 0;
      height: 100%;
      z-index: 1;
    }

    .qnav button .sub-bar.proficient { background: linear-gradient(180deg, var(--lv5) 0%, var(--lv5-dark) 100%); }
    .qnav button .sub-bar.familiar   { background: linear-gradient(180deg, var(--lv4) 0%, var(--lv4-dark) 100%); }
    .qnav button .sub-bar.vague      { background: linear-gradient(180deg, var(--lv3) 0%, var(--lv3-dark) 100%); }
    .qnav button .sub-bar.rusty      { background: linear-gradient(180deg, var(--lv2) 0%, var(--lv2-dark) 100%); }
    .qnav button .sub-bar.wrong      { background: linear-gradient(180deg, var(--lv1) 0%, var(--lv1-dark) 100%); }

    .qnav button.has-subs .btn-text {
      position: relative;
      z-index: 2;
    }

    .qnav button.has-subs.has-color .btn-text {
      color: #fff;
    }

    .qnav button.has-subs.active .sub-bar {
      display: none;
    }

    .qnav button .sub-bar.active-sub {
      background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%) !important;
      z-index: 3;
      box-shadow: 0 0 0 1px var(--primary-dark);
    }

    /* 不达标角标 */
    .qnav button .img-badges {
      position: absolute;
      top: 1px;
      right: 2px;
      display: flex;
      gap: 1px;
      font-size: 10px;
      line-height: 1;
    }

    .qbad-dot {
      color: var(--unfamiliar);
      font-weight: bold;
    }

    .sbad-dot {
      color: var(--uncertain-dark);
      font-weight: bold;
    }

    .note-dot {
      /* 亮黄，区别于主色紫（避免与当前题激活紫撞）、标注青、熟练绿/模糊橙/不会红 */
      color: #fff200;
      font-weight: bold;
      font-size: 13px;
    }

    .annot-dot {
      /* 用亮蓝（标注色板 #1e90ff）区分于模糊橙/笔记黄/熟练绿/不会红 */
      color: #1e90ff;
      font-weight: bold;
      font-size: 13px;
    }

    /* ===== 分区标题与空占位 ===== */
    .section-header {
      grid-column: 1 / -1;
      font-size: 13px;
      color: var(--primary);
      font-weight: bold;
      margin-top: 8px;
      margin-bottom: 2px;
      padding: 2px 4px;
    }
    .section-empty {
      grid-column: 1 / -1;
      font-size: 12px;
      color: #bbb;
      padding: 2px 4px 6px;
    }

    /* ===== SM-2 信息行（mastery-bar 下方） ===== */
    .sm2-info-bar {
      font-size: 12px; color: var(--text-muted); text-align: center;
      padding: 4px 0 2px; letter-spacing: 0.5px;
    }
    .sm2-info-bar span { margin: 0 8px; }
    .sm2-info-bar .sm2-due-tag { color: #007AFF; font-weight: 600; }
    .sm2-info-bar .sm2-overdue-tag { color: #D32F2F; font-weight: 600; }

    /* ===== SM-2 复习面板 ===== */
    .sm2-panel { padding: 16px; }
    .sm2-stats-row { display: flex; gap: 10px; margin-bottom: 14px; }
    .sm2-stat-card {
      flex: 1; background: var(--glass-bg); border: 1px solid var(--glass-border);
      border-radius: var(--radius-md); padding: 12px 8px; text-align: center;
      cursor: default; transition: transform 0.15s;
    }
    .sm2-stat-card:hover { transform: translateY(-2px); }
    .sm2-stat-num { font-size: 28px; font-weight: 700; color: var(--primary); }
    .sm2-stat-label { font-size: 11px; color: var(--text-muted); margin-top: 2px; }
    .sm2-mode-row {
      display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
      padding: 10px; background: var(--glass-bg); border-radius: var(--radius-sm);
      border: 1px solid var(--glass-border);
    }
    .sm2-mode-label { font-size: 13px; color: var(--text-muted); margin-right: 4px; }
    .sm2-radio { font-size: 13px; cursor: pointer; display: flex; align-items: center; gap: 3px; }
    .sm2-radio input { accent-color: var(--primary); }
    .sm2-overview .gel-btn { width: 100%; margin-bottom: 14px; font-size: 14px; padding: 8px 0; }
    .sm2-chapters { display: flex; flex-direction: column; gap: 6px; }
    .sm2-ch-row {
      background: var(--glass-bg); border: 1px solid var(--glass-border);
      border-radius: var(--radius-sm); padding: 10px 12px;
      display: flex; align-items: center; justify-content: space-between;
      cursor: default; font-size: 13px;
    }
    .sm2-ch-info { display: flex; align-items: center; gap: 10px; }
    .sm2-ch-name { font-weight: 600; color: var(--text); }
    .sm2-ch-stats { font-size: 11px; color: var(--text-muted); }
    .sm2-ch-due { color: #007AFF; font-weight: 600; }
    .sm2-ch-overdue { color: #D32F2F; font-weight: 600; }
    .sm2-ch-btn {
      padding: 4px 14px; border-radius: 8px; border: none; cursor: pointer;
      font-size: 12px; font-weight: 600; transition: all 0.15s;
      background: var(--primary); color: #fff;
    }
    .sm2-ch-btn:hover { filter: brightness(1.1); }
    .sm2-resume-btn {
      display: block; width: 100%; margin: 4px 0 10px; padding: 10px 0;
      border-radius: 10px; border: 2px solid var(--primary); cursor: pointer;
      font-size: 14px; font-weight: 700; color: var(--primary);
      background: transparent; transition: all 0.15s;
    }
    .sm2-resume-btn:hover { background: var(--primary); color: #fff; }
    .sm2-toast {
      margin: 4px 0 10px; padding: 8px 12px; border-radius: 8px;
      font-size: 13px; color: var(--text-muted); background: rgba(0,0,0,0.04);
      text-align: center;
    }
    .sm2-module-header {
      display: flex; align-items: center; gap: 10px; padding: 8px 4px;
      font-weight: 700; color: var(--primary); font-size: 15px; margin-top: 10px;
    }
    .sm2-module-header:first-child { margin-top: 0; }
    .sm2-module-name { flex: 0 0 auto; }
    .sm2-mod-stats { flex: 1 1 auto; font-size: 12px; font-weight: 400; }
    .sm2-mod-btn {
      padding: 4px 12px; border-radius: 8px; border: none; cursor: pointer;
      font-size: 12px; font-weight: 600; transition: all 0.15s;
      background: var(--primary); color: #fff;
    }
    .sm2-mod-btn:hover { filter: brightness(1.1); }

    /* ===== 复习态侧栏队列 ===== */
    #reviewQueuePanel {
      background: rgba(255,255,255,0.55); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      border-radius: 12px; padding: 12px; border: 1px solid rgba(255,255,255,0.45); margin-top: 12px;
    }
    .review-queue-header {
      font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 8px;
    }
    .review-queue {
      display: grid; grid-template-columns: repeat(auto-fill, minmax(30px, 1fr)); gap: 6px;
    }
    .review-q {
      height: 30px; border-radius: 7px; border: 1px solid var(--glass-border);
      background: #fff; color: var(--text); font-size: 12px; cursor: pointer;
      transition: all 0.12s;
    }
    .review-q:hover { border-color: var(--primary); }
    .review-q.current { background: var(--primary); color: #fff; border-color: var(--primary); font-weight: 700; }
    .review-q.graded { background: #e8f5e9; color: #2e7d32; border-color: #a5d6a7; }
    .review-q.graded.current { background: var(--primary); color: #fff; border-color: var(--primary); }
    .review-q.skipped { background: #fff; color: #bbb; border-style: dashed; }

    /* ===== 复习态控件（上一题/跳过/下一题） ===== */
    #reviewControls {
      display: flex; gap: 8px; justify-content: center; padding: 6px 0 4px;
    }
    #reviewControls button {
      padding: 5px 16px; border-radius: 8px; border: 1px solid var(--glass-border);
      background: var(--glass-bg); color: var(--text); font-size: 13px; cursor: pointer;
      transition: all 0.15s;
    }
    #reviewControls button:hover { border-color: var(--primary); color: var(--primary); }
    #reviewControls #btnReviewSkip { color: var(--text-muted); }

    /* ===== 错题本 5 级颜色 ===== */
    .wrongbook-q-item.wrong { background: linear-gradient(180deg, var(--lv1) 0%, var(--lv1-dark) 100%); }
    .wrongbook-q-item.rusty { background: linear-gradient(180deg, var(--lv2) 0%, var(--lv2-dark) 100%); }
    .wrongbook-q-item.vague { background: linear-gradient(180deg, var(--lv3) 0%, var(--lv3-dark) 100%); }
    .wrongbook-q-item.familiar { background: linear-gradient(180deg, var(--lv4) 0%, var(--lv4-dark) 100%); }

    /* ===== 题目图/解析图不达标提示 ===== */
    .img-bad-warning {
      display: none;
      font-size: 12px;
      color: var(--unfamiliar);
      font-weight: bold;
      text-align: center;
      margin-bottom: 6px;
      padding: 4px 12px;
      background: #fde8e8;
      border: 1px solid #f5c6cb;
      border-radius: 4px;
    }

    .img-bad-warning.show {
      display: block;
    }

    .img-bad-warning.solution-warn {
      color: var(--uncertain-dark);
      background: #fef3e2;
      border-color: #fad7a0;
      margin-bottom: 8px;
      margin-top: 0;
    }

    .question-img.qbad-border {
      border: 2px solid var(--unfamiliar);
      border-radius: 4px;
    }

    .solution-img.sbad-border {
      border: 2px solid var(--uncertain-dark);
      border-radius: 4px;
    }

    /* ===== 主区域（Liquid Glass 效果） ===== */
    .main-area {
      width: 100%;
      max-width: 900px;
      margin: 0 auto;
      background: rgba(255, 255, 255, 0.82);
      backdrop-filter: blur(16px) saturate(1.2);
      -webkit-backdrop-filter: blur(16px) saturate(1.2);
      border-radius: 16px;
      border: 1px solid rgba(255, 255, 255, 0.55);
      box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06),
        0 1px 3px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.7);
      padding: 24px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .question-img {
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
      align-self: center;
      cursor: zoom-in;
    }

    /* ===== 图片标注（marker.js 3）叠加容器 ===== */
    .annot-wrapper {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      max-width: 100%;
    }
    .annot-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none; /* 不拦截图片点击，仅显示标注 */
    }
    .annot-overlay markerjs-viewer,
    .annot-overlay .markerjs-viewer,
    .annot-overlay mjs-marker-view {
      width: 100% !important;
      height: 100% !important;
      pointer-events: none; /* 只读标注层不拦截点击，穿透到底图打开灯箱 */
    }
    .annot-overlay markerjs-viewer svg,
    .annot-overlay .markerjs-viewer svg,
    .annot-overlay mjs-marker-view svg {
      width: 100%;
      height: 100%;
      overflow: visible;
      pointer-events: none;
    }

    /* ===== 灯箱（全屏模态） ===== */
    .lightbox-overlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0, 0, 0, 0.93);
      z-index: 9999;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.25s ease, visibility 0.25s;
      cursor: zoom-out;
      backdrop-filter: blur(2px);
      -webkit-backdrop-filter: blur(2px);
    }

    .lightbox-overlay.show {
      opacity: 1;
      visibility: visible;
    }

    .lightbox-img {
      max-width: 95vw;
      max-height: 95vh;
      object-fit: contain;
      cursor: grab;
      transition: transform 0.15s ease;
      user-select: none;
      -webkit-user-drag: none;
    }

    .lightbox-img.grabbing {
      cursor: grabbing;
    }

    .lightbox-close {
      position: absolute;
      top: 20px;
      right: 28px;
      width: 44px;
      height: 44px;
      border: none;
      background: rgba(255, 255, 255, 0.12);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 50%;
      color: #fff;
      font-size: 26px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s;
      z-index: 10000;
      line-height: 1;
    }

    .lightbox-annot-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      pointer-events: none;
      z-index: 9999;
    }
    .lightbox-annot-overlay markerjs-viewer,
    .lightbox-annot-overlay .markerjs-viewer,
    .lightbox-annot-overlay mjs-marker-view {
      width: 100%;
      height: 100%;
      pointer-events: none; /* 只读查看标注层不拦截点击，背景/缩放点击穿透 */
    }

    .lightbox-annotate {
      position: absolute;
      top: 20px;
      right: 84px;
      height: 44px;
      padding: 0 20px;
      border: none;
      background: rgba(255, 255, 255, 0.14);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 22px;
      color: #fff;
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s;
      z-index: 10000;
      line-height: 1;
    }
    .lightbox-annotate:hover {
      background: rgba(21, 87, 166, 0.85);
    }
    .lightbox-annotate.has-annot {
      background: rgba(255, 149, 0, 0.35);
    }
    .lightbox-annotate.has-annot:hover {
      background: rgba(255, 149, 0, 0.6);
    }

    .lightbox-close:hover {
      background: rgba(255, 255, 255, 0.28);
    }

    .lightbox-hint {
      position: absolute;
      bottom: 22px;
      left: 50%;
      transform: translateX(-50%);
      color: rgba(255, 255, 255, 0.45);
      font-size: 13px;
      pointer-events: none;
      letter-spacing: 0.5px;
    }

    /* marker.js 宿主需固定 flex：否则其内联 display 被清除后回退 block 会导致布局塌缩 */
    mjs-marker-area { display: flex; }

    /* ===== 标注工具栏（Snipaste 风格 — 单排底部居中） ===== */
    .annot-toolbar {
      position: absolute;
      bottom: 18px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      align-items: center;
      gap: 1px;
      padding: 4px 6px;
      background: rgba(32, 34, 44, 0.94);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.10);
      border-radius: 10px;
      box-shadow: 0 4px 24px rgba(0, 0, 0, 0.55), 0 0 0 0.5px rgba(255,255,255,0.06);
      z-index: 10002;
      max-width: 98vw;
      flex-wrap: nowrap;          /* 核心：绝不换行，保持单排 */
      white-space: nowrap;
      justify-content: center;
      user-select: none;
    }
    .at-btn {
      min-width: 28px;
      height: 30px;
      padding: 0 4px;
      flex: 0 0 auto;             /* 图标按钮禁止收缩 */
      border: none;
      border-radius: 6px;
      background: transparent;
      color: #c8cdd8;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.12s ease;
      line-height: 1;
      white-space: nowrap;
      position: relative;
    }
    .at-btn svg { display: block; width: 17px; height: 17px; }
    .at-btn:hover {
      background: rgba(255, 255, 255, 0.10);
      color: #e8ecf2;
    }
    .at-btn:active { background: rgba(255, 255, 255, 0.06); }
    .at-btn.active {
      background: rgba(21, 87, 166, 0.85);
      color: #fff;
      box-shadow: 0 0 0 2px rgba(255,255,255,0.15);
    }
    .at-btn.active:hover { background: rgba(126, 10, 144, 0.85); }
    .at-sep {
      width: 1px;
      height: 18px;
      background: rgba(255, 255, 255, 0.14);
      margin: 0 3px;
      flex-shrink: 0;
    }
    /* 颜色按钮（色点 + 下拉箭头） */
    .at-color-swatch {
      min-width: 30px;
      padding: 0 3px;
      gap: 2px;
    }
    .at-color-dot {
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: #ff0000;
      border: 2px solid rgba(255, 255, 255, 0.3);
      box-sizing: border-box;
      flex-shrink: 0;
    }
    /* 粗细复合控件（- 滑块 + 数值） */
    .at-width-wrap {
      flex: 0 1 78px;             /* 允许整体收缩，单排兜底 */
      min-width: 0;
      display: flex;
      align-items: center;
      gap: 1px;
      margin: 0 1px;
    }
    .at-width-step {
      width: 18px;
      min-width: 18px;
      height: 26px;
      padding: 0;
      border: none;
      border-radius: 4px;
      background: transparent;
      color: #c8cdd8;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .at-width-step:hover { background: rgba(255, 255, 255, 0.10); color: #fff; }
    .at-width {
      flex: 1 1 32px;
      min-width: 0;               /* 允许 range 收缩 */
      accent-color: #a855f7;
      cursor: pointer;
      margin: 0;
    }
    .at-width-val {
      font-size: 10px;
      color: #9aa0ab;
      width: 12px;
      text-align: center;
      flex: 0 0 auto;
    }
    .at-save {
      flex: 0 1 auto;
      background: rgba(21, 87, 166, 0.85);
      color: #fff;
      font-weight: 600;
      font-size: 12px;
      padding: 0 8px;
    }
    .at-save:hover { background: rgba(126, 10, 144, 0.88); }
    .at-cancel {
      flex: 0 1 auto;
      background: rgba(255, 255, 255, 0.08);
      color: #bcc2cc;
      font-size: 12px;
      padding: 0 6px;
    }
    .at-cancel:hover { background: rgba(255, 255, 255, 0.15); color: #e8ecf2; }

    /* ===== 预设色板弹层（工具栏上方居中） ===== */
    .annot-palette {
      position: absolute;
      bottom: 62px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 10003;
      background: rgba(32, 34, 44, 0.97);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 10px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.55);
      padding: 8px;
      max-width: 265px;
    }
    .annot-palette-swatches {
      display: flex;
      flex-wrap: wrap;
      gap: 5px;
      max-width: 245px;           /* 每排 10 个 20px + 间隙（20 色共两行） */
    }
    .at-swatch {
      width: 20px;
      height: 20px;
      padding: 0;
      border: none;
      border-radius: 50%;
      cursor: pointer;
      box-sizing: border-box;
      border: 2px solid rgba(255, 255, 255, 0.22);
      transition: transform 0.1s, border-color 0.1s;
    }
    .at-swatch:hover { transform: scale(1.15); border-color: rgba(255, 255, 255, 0.6); }
    .at-swatch.active { outline: 2px solid #fff; outline-offset: 1px; border-color: transparent; }
    .annot-palette-custom {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-top: 7px;
      padding-top: 7px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      color: #9aa0ab;
      font-size: 12px;
    }
    .annot-palette-custom input[type="color"] {
      width: 22px;
      height: 22px;
      padding: 0;
      border: 2px solid rgba(255, 255, 255, 0.25);
      border-radius: 50%;
      background: none;
      cursor: pointer;
    }

    /* ===== 当前题号标签（图片上方，偏左） ===== */
    .q-label {
      width: 100%;
      text-align: left;
      font-size: 17px;
      font-weight: bold;
      color: var(--primary);
      margin-bottom: 8px;
      letter-spacing: 0.5px;
    }

    /* ===== 子题选择栏（图片上方） ===== */
    .sub-select-bar {
      width: 100%;
      text-align: left;
      margin-bottom: 10px;
    }

    .sub-select-bar .sub-sel-btn {
      min-height: 26px;
      padding: 3px 10px;
      border: 1px solid var(--border);
      border-radius: var(--radius-pill);
      background: linear-gradient(180deg, var(--gel-top) 0%, var(--gel-bot) 100%);
      cursor: pointer;
      font-size: 13px;
      color: #555;
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.7);
      transition: all 0.15s;
      white-space: nowrap;
      margin-right: 6px;
      margin-bottom: 4px;
    }

    .sub-select-bar .sub-sel-btn:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-1px);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    }

    .sub-select-bar .sub-sel-btn.active {
      background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #fff;
      border-color: var(--primary);
      font-weight: bold;
      box-shadow: 0 2px 8px rgba(47, 128, 237, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25);
    }

    /* ===== 掌握度 / 标注栏 ===== */
    .mastery-bar {
      display: flex;
      gap: 10px;
      margin: 12px 0;
      flex-wrap: wrap;
      justify-content: center;
      align-items: center;
    }

    .mastery-bar .nav-sep {
      color: var(--border);
      font-size: 13px;
      user-select: none;
      margin: 0 2px;
    }

    /* ===== 解析切换栏（居中） ===== */
    .toggle-bar {
      display: flex;
      justify-content: center;
      margin: 16px 0 8px;
    }

    /* ===== 解析区 ===== */
    .solution-area {
      width: 100%;
      border-top: 1px dashed #ddd;
      padding-top: 16px;
      margin-top: 8px;
      display: none;
    }

    .solution-area.show {
      display: block;
    }

    .solution-img {
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
    }

    /* 分片解析图容器（多张解析图垂直堆叠） */
    .solution-imgs {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      width: 100%;
    }

    .solution-imgs .solution-img {
      margin: 0 auto;
    }

    /* 题目图/解析图不达标按钮 */
    .gel-btn.btn-qbad-toggle .func-name {
      color: var(--unfamiliar);
    }

    .gel-btn.btn-qbad-toggle .key {
      color: #f5a3a3;
    }

    .gel-btn.btn-qbad-toggle.marked {
      background: linear-gradient(180deg, var(--unfamiliar) 0%, var(--unfamiliar-dark) 100%);
      color: #fff;
      box-shadow: 0 2px 8px var(--unfamiliar-alpha), inset 0 1px 0 rgba(255, 255, 255, 0.25);
    }

    .gel-btn.btn-qbad-toggle.marked .func-name {
      color: #fff;
    }

    .gel-btn.btn-qbad-toggle.marked .key {
      color: rgba(255, 255, 255, 0.7);
    }

    .gel-btn.btn-sbad-toggle .func-name {
      color: var(--uncertain-dark);
    }

    .gel-btn.btn-sbad-toggle .key {
      color: #f5c199;
    }

    .gel-btn.btn-sbad-toggle.marked {
      background: linear-gradient(180deg, var(--uncertain-dark) 0%, #F57F17 100%);
      color: #fff;
      box-shadow: 0 2px 8px rgba(196, 85, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.25);
    }

    .gel-btn.btn-sbad-toggle.marked .func-name {
      color: #fff;
    }

    .gel-btn.btn-sbad-toggle.marked .key {
      color: rgba(255, 255, 255, 0.7);
    }

    /* ===== Quiet Liquid 样式变量补充 ===== */
    :root {
      --gel-top: rgba(255, 255, 255, 0.95);
      --gel-bot: rgba(246, 247, 251, 0.95);
      --gel-hov-top: #ffffff;
      --gel-hov-bot: #f1f2f8;
      --glass-bg: rgba(255, 255, 255, 0.85);
      --glass-border: rgba(226, 232, 240, 0.8);
    }

    .filter-toolbar,
    .export-section {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      box-shadow: 0 14px 34px rgba(61, 67, 99, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.78);
      backdrop-filter: blur(12px) saturate(1.12);
      -webkit-backdrop-filter: blur(12px) saturate(1.12);
    }

    .filter-toolbar,
    .export-section {
      border-radius: var(--radius-md);
      padding: 14px;
    }

    .filter-toolbar {
      gap: 8px;
    }

    .filter-toolbar .filter-label,
    .export-section .export-label,
    .qnav-label {
      color: #555b6c;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.08em;
    }

    .filter-toolbar .filter-label {
      margin-bottom: 0;
    }

    .filter-hint {
      margin: -3px 0 4px;
      color: #8b8f9d;
      font-size: 11px;
    }

    .gel-btn,
    .filter-btn,
    .export-btn,
    .sol-default-btn,
    .qnav button,
    .sub-select-bar .sub-sel-btn {
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.76);
      box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.86);
      transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease, color 160ms ease;
    }

    .gel-btn:hover,
    .filter-btn:hover,
    .export-btn:hover,
    .sol-default-btn:hover,
    .qnav button:hover,
    .sub-select-bar .sub-sel-btn:hover {
      background: rgba(255, 255, 255, 0.96);
      border-color: rgba(47, 128, 237, 0.34);
      box-shadow: 0 8px 18px rgba(53, 58, 89, 0.1), inset 0 1px 0 #fff;
      transform: translateY(-1px);
    }

    .gel-btn:active,
    .filter-btn:active,
    .export-btn:active,
    .sol-default-btn:active,
    .qnav button:active,
    .sub-select-bar .sub-sel-btn:active {
      transform: translateY(0);
    }

    .gel-btn:focus-visible,
    .filter-btn:focus-visible,
    .export-btn:focus-visible,
    .sol-default-btn:focus-visible,
    .qnav button:focus-visible,
    .sub-select-bar .sub-sel-btn:focus-visible,
    .lightbox-close:focus-visible {
      outline: 3px solid rgba(47, 128, 237, 0.28);
      outline-offset: 2px;
    }

    .filter-btn {
      position: relative;
      min-height: 46px;
      padding: 7px 10px 7px 12px;
      color: #4f5362 !important;
      text-align: left;
    }

    .filter-btn .filter-count {
      position: absolute;
      top: 7px;
      right: 8px;
      min-width: 24px;
      padding: 2px 6px;
      border-radius: 8px;
      background: rgba(71, 76, 101, 0.08);
      color: #686d7c;
      font-variant-numeric: tabular-nums;
      text-align: center;
      opacity: 1;
    }

    .filter-btn .filter-key {
      margin-top: 3px;
      color: #a0a3ae;
    }

    .filter-btn.active {
      font-weight: 650;
      box-shadow: inset 0 0 0 1px currentColor, var(--shadow-sm);
    }

    .filter-btn[data-filter="all"].active {
      color: var(--primary) !important;
      background: rgba(47, 128, 237, 0.11);
      border-color: rgba(47, 128, 237, 0.35);
    }

    .filter-btn[data-filter="proficient"].active {
      color: var(--lv5-dark) !important;
      background: rgba(36, 138, 61, 0.12);
      border-color: rgba(36, 138, 61, 0.42);
    }
    .filter-btn[data-filter="familiar"].active {
      color: var(--lv4-dark) !important;
      background: rgba(0, 137, 123, 0.12);
      border-color: rgba(0, 137, 123, 0.42);
    }
    .filter-btn[data-filter="vague"].active {
      color: var(--lv3-dark) !important;
      background: rgba(255, 149, 0, 0.13);
      border-color: rgba(255, 149, 0, 0.45);
    }
    .filter-btn[data-filter="rusty"].active {
      color: var(--lv2-dark) !important;
      background: rgba(255, 107, 53, 0.13);
      border-color: rgba(255, 107, 53, 0.45);
    }
    .filter-btn[data-filter="wrong"].active {
      color: var(--lv1-dark) !important;
      background: rgba(255, 59, 48, 0.12);
      border-color: rgba(255, 59, 48, 0.42);
    }

    .filter-btn[data-filter="unmarked"].active {
      color: #656a79 !important;
      background: rgba(92, 98, 117, 0.11);
      border-color: rgba(92, 98, 117, 0.34);
    }

    .filter-btn.active .filter-count {
      background: rgba(255, 255, 255, 0.62);
      color: currentColor;
    }

    .filter-btn.active .filter-key {
      color: currentColor;
      opacity: 0.62;
    }

    .sub-select-bar .sub-sel-btn.active,
    .qnav button.active {
      color: #fff !important;
      border-color: var(--primary);
      background: linear-gradient(145deg, var(--primary-light), var(--primary-dark));
      box-shadow: 0 7px 16px rgba(21, 87, 166, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.28);
    }

    .chapter-title {
      margin: 2px 0 16px;
      color: #303342;
      font-size: clamp(19px, 2vw, 24px);
      letter-spacing: 0.02em;
    }

    .main-area {
      max-width: 980px;
      padding: 24px 26px 28px;
      background: rgba(255, 255, 255, 0.55);
      border: 1px solid rgba(255, 255, 255, 0.55);
      border-radius: var(--radius-lg);
      box-shadow: 0 22px 55px rgba(48, 53, 82, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.28);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
    }

    .q-label {
      color: var(--primary);
      font-size: 16px;
    }

    .mastery-bar {
      width: 100%;
      margin: 0 0 18px;
      padding: 10px;
      border: 1px solid rgba(71, 76, 101, 0.1);
      border-radius: var(--radius-md);
      background: #f7f8fb;
    }

    .mastery-label {
      color: #777c8b;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.06em;
    }

    .gel-btn.btn-status {
      min-width: 82px;
      justify-content: center;
    }

    .gel-btn.btn-status.proficient {
      color: var(--mastered-dark);
      border-color: rgba(36, 138, 61, 0.45);
      background: rgba(36, 138, 61, 0.12);
      box-shadow: inset 0 0 0 1px rgba(36, 138, 61, 0.16);
    }

    .gel-btn.btn-status.vague {
      color: var(--uncertain-dark);
      border-color: rgba(255, 149, 0, 0.45);
      background: rgba(255, 149, 0, 0.13);
      box-shadow: inset 0 0 0 1px rgba(255, 149, 0, 0.16);
    }

    .gel-btn.btn-status.wrong {
      color: var(--unfamiliar-dark);
      border-color: rgba(255, 59, 48, 0.44);
      background: rgba(255, 59, 48, 0.12);
      box-shadow: inset 0 0 0 1px rgba(255, 59, 48, 0.16);
    }

    .gel-btn.btn-status.active .func-name {
      color: currentColor;
    }

    .gel-btn.btn-status.active .key {
      color: currentColor;
      opacity: 0.62;
    }

    .gel-btn.btn-status.active {
      box-shadow: inset 0 0 0 1px currentColor, 0 5px 12px rgba(53, 58, 89, 0.08);
    }

    .solution-area {
      border-top-color: rgba(71, 76, 101, 0.14);
    }

    .qnav {
      gap: 6px;
    }

    .qnav button {
      border-radius: 9px;
    }

    .qnav button.filtered-out {
      opacity: 0;
    }

    .export-section {
      margin-top: 12px;
    }

    .sol-default-btn {
      margin-top: 12px;
      min-height: 44px;
      background: var(--glass-bg);
    }

    @supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {

      .filter-toolbar,
      .export-section,
      .chapter-selector,
      .sol-default-btn {
        background: rgba(250, 251, 253, 0.96);
      }
    }

    /* ===== 现代响应式断点与设备适配 ===== */
    @media (max-width: 1280px) {
      .workbench-body {
        gap: 18px;
        padding: 18px 20px 40px;
      }
      .sidebar-left {
        width: 220px;
        flex: 0 0 220px;
      }
      .sidebar-right {
        width: 240px;
        flex: 0 0 240px;
      }
    }

    @media (max-width: 1024px) {
      .sidebar-left {
        width: 200px;
        flex: 0 0 200px;
      }
      .sidebar-right {
        width: 220px;
        flex: 0 0 220px;
      }
      .workbench-body {
        gap: 16px;
        padding: 16px 16px 40px;
      }
    }

    @media (max-width: 768px) {
      /* 左侧导航栏转为滑出抽屉 */
      .sidebar-left {
        position: fixed;
        left: -260px;
        top: 0;
        bottom: 0;
        width: 260px;
        flex: none;
        z-index: 1000;
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.25);
        transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      }

      body.sidebar-open .sidebar-left {
        transform: translateX(260px);
      }

      body.sidebar-open .sidebar-backdrop {
        display: block;
      }

      .sidebar-close-btn {
        display: block;
      }

      .mobile-menu-toggle {
        display: flex;
      }

      .workbench-body {
        flex-direction: column;
        padding: 12px 14px 80px;
        gap: 16px;
      }

      .sidebar-right {
        width: 100%;
        position: static;
        max-height: none;
        order: 3;
      }

      .main-content {
        order: 1;
        width: 100%;
      }

      /* 移动端底部快捷操作栏启用 */
      .mobile-action-bar {
        display: flex;
      }

      .db-stat-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .main-area {
        padding: 18px 14px 20px;
        border-radius: 14px;
      }

      .notes-duo {
        flex-direction: column;
      }
    }

    @media (max-width: 480px) {
      .account-bar {
        padding: 0 14px;
        height: 54px;
      }

      .header-user-info {
        display: none;
      }

      .crumb-root, .crumb-sep {
        display: none;
      }

      .hero-greeting {
        font-size: 18px;
      }

      .hero-subtitle {
        font-size: 12px;
      }

      .hero-decor-badge {
        display: none;
      }

      .db-hero-card {
        padding: 20px 16px;
      }

      .mastery-bar {
        gap: 6px;
      }

      .mastery-bar .gel-btn {
        flex: 1 1 calc(33.333% - 6px);
        min-width: 72px;
        padding: 7px 6px;
        font-size: 12px;
        justify-content: center;
      }

      .mastery-bar .nav-sep {
        display: none;
      }

      .qnav {
        grid-template-columns: repeat(5, 1fr);
      }
    }

    /* 390px 和 320px 极窄屏无横向滚动防御 */
    @media (max-width: 390px) {
      html, body {
        overflow-x: hidden !important;
        width: 100% !important;
      }

      .workbench-body {
        padding: 8px 8px 74px;
      }

      .main-area {
        padding: 14px 10px;
        border-radius: 12px;
      }

      .db-stat-grid {
        grid-template-columns: 1fr;
        gap: 10px;
      }

      .m-action-btn .m-text {
        display: none;
      }

      .m-pill {
        padding: 0 8px;
        font-size: 11px;
      }

      .mastery-bar .gel-btn {
        flex: 1 1 calc(50% - 6px);
      }

      .chapter-title-bar {
        font-size: 17px;
      }
    }

    @media (prefers-reduced-motion: reduce) {

      *,
      *::before,
      *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
      }
    }
    #mainAreaContent {
      min-width: 0;
      max-width: 100%;
    }

    /* ===== 笔记区 ===== */
    .notes-section {
      width: 100%;
      min-width: 0;
      max-width: 100%;
      border-top: 1px dashed rgba(71, 76, 101, 0.14);
      padding-top: 14px;
      margin-top: 10px;
    }

    .notes-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 8px;
    }

    .notes-title {
      font-size: 13px;
      font-weight: 500;
      color: #555b6c;
    }

    .notes-duo {
      display: flex;
      gap: 10px;
      margin-bottom: 8px;
    }

    .notes-textarea {
      flex: 1;
      width: 100%;
      min-width: 0;
      min-height: 80px;
      padding: 10px 12px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-family: "Microsoft YaHei", sans-serif;
      font-size: 15px;
      line-height: 1.7;
      color: var(--text);
      background: #fafbfc;
      resize: vertical;
      transition: border-color 160ms ease;
    }

    .notes-textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(47, 128, 237, 0.08);
    }

    .notes-render {
      width: 100%;
      min-width: 0;
      max-width: 100%;
      box-sizing: border-box;
      padding: 10px 12px;
      border: 1px solid rgba(71, 76, 101, 0.08);
      border-radius: var(--radius-sm);
      background: #fafbfc;
      font-size: 15px;
      line-height: 1.7;
      color: var(--text);
      word-break: break-word;
      min-height: 40px;
      overflow-wrap: break-word;
    }

    .notes-preview {
      flex: 1;
      min-width: 0;
      max-height: 300px;
      overflow-y: auto;
    }

    .notes-render:empty::after {
      content: '暂无笔记';
      color: #bbb;
      font-style: italic;
    }

    /* ===== 笔记 Markdown 排版 ===== */
    .notes-render h1, .notes-render h2, .notes-render h3, .notes-render h4 {
      margin: 0.6em 0 0.35em;
      line-height: 1.35;
      color: var(--primary);
      font-weight: 700;
    }
    .notes-render h1 { font-size: 1.5em; border-bottom: 1px solid rgba(47, 128, 237, 0.15); padding-bottom: 0.2em; }
    .notes-render h2 { font-size: 1.3em; }
    .notes-render h3 { font-size: 1.15em; }
    .notes-render h4 { font-size: 1.05em; }
    .notes-render p {
      margin: 0.35em 0;
      min-width: 0;
      max-width: 100%;
    }
    .notes-render ul, .notes-render ol { margin: 0.35em 0; padding-left: 1.6em; }
    .notes-render li { margin: 0.15em 0; }
    .notes-render blockquote {
      margin: 0.5em 0;
      padding: 0.2em 1em;
      border-left: 3px solid rgba(47, 128, 237, 0.35);
      color: #666;
      background: rgba(47, 128, 237, 0.04);
      border-radius: 0 6px 6px 0;
    }
    .notes-render code {
      font-family: Consolas, "Courier New", monospace;
      font-size: 0.88em;
      background: rgba(47, 128, 237, 0.08);
      border-radius: 4px;
      padding: 1px 5px;
      color: #8a2b9c;
    }
    .notes-render pre {
      margin: 0.5em 0;
      padding: 10px 12px;
      background: #f1f2f6;
      border: 1px solid rgba(71, 76, 101, 0.12);
      border-radius: 8px;
      overflow-x: auto;
    }
    .notes-render pre code {
      background: transparent;
      padding: 0;
      color: inherit;
    }
    .notes-render a { color: var(--primary); text-decoration: none; }
    .notes-render a:hover { text-decoration: underline; }
    .notes-render table {
      border-collapse: collapse;
      margin: 0.5em 0;
      max-width: 100%;
      display: block;
      overflow-x: auto;
    }
    .notes-render th, .notes-render td {
      border: 1px solid rgba(71, 76, 101, 0.18);
      padding: 5px 10px;
    }
    .notes-render th { background: rgba(47, 128, 237, 0.06); font-weight: 700; }
    .notes-render img { max-width: 100%; height: auto; border-radius: 6px; }
    .notes-render hr { border: none; border-top: 1px solid rgba(71, 76, 101, 0.18); margin: 0.8em 0; }

    .notes-render .katex-display {
      display: block;
      width: 100%;
      min-width: 0;
      max-width: 100%;
      box-sizing: border-box;
      overflow-x: auto;
      overflow-y: hidden;
      margin: 0.5em 0;
      padding: 2px 0 4px;
      -webkit-overflow-scrolling: touch;
    }

    .notes-render .katex-display > .katex {
      white-space: nowrap;
    }

    .notes-actions {
      display: flex;
      gap: 8px;
      justify-content: flex-end;
    }

    .notes-actions button {
      padding: 5px 14px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 12px;
      background: #fff;
      color: #555;
      transition: all 160ms ease;
    }

    .notes-actions button:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .notes-actions button.btn-save {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }

    .notes-actions button.btn-save:hover {
      background: var(--primary-dark);
    }

    /* 快捷键帮助模态 */
    .shortcut-overlay {
      position: fixed; top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,0,0,0.45); z-index: 9999;
      display: flex; align-items: center; justify-content: center;
      opacity: 0; pointer-events: none; transition: opacity 0.2s;
      backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
    }
    .shortcut-overlay.show { opacity: 1; pointer-events: auto; }
    .shortcut-modal {
      background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
      border-radius: 16px; padding: 32px 36px; max-width: 680px; width: 90%;
      max-height: 80vh; overflow-y: auto;
      box-shadow: 0 20px 60px rgba(0,0,0,0.18); border: 1px solid rgba(255,255,255,0.6);
    }
    .shortcut-modal h2 {
      margin: 0 0 24px; font-size: 20px; text-align: center; color: #333;
    }
    .shortcut-group {
      margin-bottom: 20px;
    }
    .shortcut-group-title {
      font-size: 13px; font-weight: 700; color: var(--primary);
      margin-bottom: 8px; padding-bottom: 4px; border-bottom: 1px solid rgba(0,0,0,0.08);
    }
    .shortcut-row {
      display: flex; align-items: center; padding: 4px 0; font-size: 13px;
    }
    .shortcut-row .key {
      display: inline-block; min-width: 100px; text-align: right; margin-right: 14px;
    }
    .shortcut-row .key kbd {
      background: #f0f0f0; border: 1px solid #ccc; border-radius: 4px;
      padding: 2px 6px; font-size: 12px; font-family: inherit; color: #555;
      box-shadow: 0 1px 1px rgba(0,0,0,0.08); margin: 0 1px;
    }
    .shortcut-row .desc {
      color: #666;
    }
    .shortcut-close-hint {
      text-align: center; margin-top: 20px; font-size: 12px; color: #999;
    }
    /* 科目选择模态 */
    .subject-list {
      display: flex; flex-direction: column; gap: 12px;
    }
    .subject-option {
      display: flex; align-items: center; justify-content: space-between;
      padding: 14px 18px; border-radius: 12px; border: 1px solid rgba(0,0,0,0.08);
      background: rgba(255,255,255,0.6); cursor: pointer; font-size: 15px; color: #333;
      font-family: inherit; text-align: left;
    }
    .subject-option:hover {
      background: rgba(255,255,255,0.95); border-color: var(--primary);
    }
    .subject-option .subj-desc {
      font-size: 12px; color: #999;
    }

    /* ===== Supabase 登录 Gate & 账号状态条（拟物玻璃拟态） ===== */
    [hidden],
    .auth-gate[hidden],
    #authGate[hidden],
    #appShell[hidden] {
      display: none !important;
    }

    .auth-gate {
      position: fixed;
      inset: 0;
      z-index: 9999;
      display: flex;
      align-items: center;
      justify-content: center;
      background:
        radial-gradient(circle at 20% 20%, rgba(174, 154, 232, 0.4), transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(140, 190, 226, 0.35), transparent 40%),
        rgba(238, 242, 247, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      padding: 20px;
    }

    .auth-card {
      width: 100%;
      max-width: 420px;
      padding: 36px 32px;
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.8);
      box-shadow: 0 12px 36px rgba(47, 128, 237, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .auth-card h1 {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      text-align: center;
      letter-spacing: -0.5px;
    }

    .auth-card p {
      font-size: 13px;
      color: #6b7280;
      text-align: center;
      margin-bottom: 8px;
    }

    .auth-card label {
      font-size: 13px;
      font-weight: 600;
      color: #374151;
      margin-top: 4px;
    }

    .auth-card input {
      width: 100%;
      padding: 10px 14px;
      border-radius: 10px;
      border: 1px solid rgba(0, 0, 0, 0.12);
      background: rgba(255, 255, 255, 0.9);
      font-size: 14px;
      color: #1f2937;
      outline: none;
      transition: all 0.2s ease;
    }

    .auth-card input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--primary-alpha);
    }

    .auth-card button[type="submit"] {
      margin-top: 12px;
      padding: 12px 20px;
      border: none;
      border-radius: var(--radius-pill);
      background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #fff;
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 4px 12px var(--primary-alpha);
      transition: all 0.2s ease;
    }

    .auth-card button[type="submit"]:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px var(--primary-alpha);
    }

    .auth-message {
      font-size: 13px;
      min-height: 18px;
      text-align: center;
      margin-top: 4px;
      color: #10b981;
    }

    .auth-message.is-error {
      color: #ef4444;
    }

    /* ===== 顶部白色 Header（面包屑与用户信息） ===== */
    .account-bar {
      width: 100%;
      height: 58px;
      background: #ffffff;
      border-bottom: 1px solid var(--border);
      padding: 0 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      position: sticky;
      top: 0;
      z-index: 40;
      box-shadow: 0 1px 3px rgba(15, 23, 42, 0.03);
    }

    .header-nav-left {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .mobile-menu-toggle {
      display: none;
      background: #f1f5f9;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      width: 36px;
      height: 36px;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      cursor: pointer;
      color: var(--text);
      transition: all 0.15s ease;
    }

    .mobile-menu-toggle:hover {
      background: #e2e8f0;
    }

    .header-breadcrumbs {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
    }

    .crumb-root {
      color: var(--text-muted);
      font-weight: 500;
    }

    .crumb-sep {
      color: var(--text-subtle);
      font-size: 11px;
    }

    .crumb-current {
      color: var(--text);
      font-weight: 600;
    }

    .header-nav-right {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 13px;
      color: var(--text-muted);
    }

    .header-user-info strong {
      color: var(--text);
      font-weight: 600;
    }

    #syncStatus {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
      background: rgba(16, 185, 129, 0.1);
      color: #059669;
    }

    #syncStatus.is-error {
      background: rgba(239, 68, 68, 0.1);
      color: #dc2626;
    }

    #btnLogout {
      padding: 6px 14px;
      border-radius: var(--radius-pill);
      border: 1px solid var(--border);
      background: #ffffff;
      font-size: 12px;
      font-weight: 500;
      color: var(--text-muted);
      cursor: pointer;
      transition: all 0.15s ease;
    }

    #btnLogout:hover {
      background: #fef2f2;
      color: #ef4444;
      border-color: rgba(239, 68, 68, 0.3);
    }

    /* ===== 全局进度仪表盘现代化组件 ===== */
    .db-hero-card {
      background: linear-gradient(135deg, #67b3ff 0%, #2878e8 100%);
      border-radius: 16px;
      color: #ffffff;
      padding: 26px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 10px 25px -5px rgba(40, 120, 232, 0.35);
      margin-bottom: 22px;
    }

    .hero-greeting {
      font-size: 22px;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 6px;
    }

    .hero-subtitle {
      font-size: 14px;
      color: rgba(255, 255, 255, 0.88);
      margin-bottom: 16px;
    }

    .hero-subtitle strong {
      color: #ffffff;
      font-weight: 700;
    }

    .hero-actions {
      display: flex;
      gap: 12px;
    }

    .hero-action-btn {
      padding: 8px 20px;
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.18s ease;
      border: none;
    }

    .hero-action-btn.primary {
      background: #ffffff;
      color: #1d4ed8;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }

    .hero-action-btn.primary:hover {
      background: #f8fafc;
      transform: translateY(-1px);
    }

    .hero-action-btn.secondary {
      background: rgba(255, 255, 255, 0.16);
      color: #ffffff;
      border: 1px solid rgba(255, 255, 255, 0.35);
      backdrop-filter: blur(4px);
    }

    .hero-action-btn.secondary:hover {
      background: rgba(255, 255, 255, 0.28);
    }

    .hero-decor-badge {
      width: 96px;
      height: 96px;
      border-radius: 50%;
      border: 5px solid rgba(255, 255, 255, 0.28);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(4px);
    }

    .hero-ring-val {
      font-size: 22px;
      font-weight: 800;
      line-height: 1.1;
    }

    .hero-ring-label {
      font-size: 11px;
      color: rgba(255, 255, 255, 0.85);
    }

    /* 4 个真实统计卡 */
    .db-stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-bottom: 24px;
    }

    .db-stat-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 16px 18px;
      display: flex;
      align-items: center;
      gap: 14px;
      box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
      transition: transform 0.18s ease, box-shadow 0.18s ease;
    }

    .db-stat-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(15, 23, 42, 0.06);
    }

    .stat-card-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: grid;
      place-items: center;
      font-size: 20px;
      flex-shrink: 0;
    }

    .card-due .stat-card-icon { background: rgba(245, 158, 11, 0.12); }
    .card-done .stat-card-icon { background: rgba(16, 185, 129, 0.12); }
    .card-wrong .stat-card-icon { background: rgba(239, 68, 68, 0.12); }
    .card-streak .stat-card-icon { background: rgba(59, 130, 246, 0.12); }

    .stat-card-info {
      display: flex;
      flex-direction: column;
    }

    .stat-card-num {
      font-size: 22px;
      font-weight: 700;
      color: var(--text);
      line-height: 1.2;
    }

    .stat-card-title {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 2px;
    }

    .db-block-header {
      margin-bottom: 14px;
    }

    .db-block-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text);
    }

    .db-block-hint {
      font-size: 12px;
      color: var(--text-muted);
    }

    .db-side-widget {
      background: #f8fafc;
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 18px;
      margin-bottom: 16px;
    }

    .widget-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
    }

    .widget-body {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 12px;
      line-height: 1.5;
    }

    .widget-btn {
      width: 100%;
      padding: 8px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      background: #ffffff;
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .widget-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* ===== 移动端快捷操作栏 ===== */
    .mobile-action-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 56px;
      background: #ffffff;
      border-top: 1px solid var(--border);
      padding: 0 12px;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      z-index: 100;
      box-shadow: 0 -4px 16px rgba(15, 23, 42, 0.08);
      box-sizing: border-box;
    }

    .m-action-btn {
      min-width: 44px;
      min-height: 44px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      background: #f8fafc;
      color: var(--text);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      padding: 0 10px;
      touch-action: manipulation;
    }

    .m-action-btn:hover {
      background: #e2e8f0;
    }

    .m-action-btn.m-toggle {
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      border-color: rgba(37, 99, 235, 0.2);
    }

    .m-status-pills {
      display: flex;
      gap: 6px;
      flex: 1;
      justify-content: center;
    }

    .m-pill {
      min-width: 44px;
      min-height: 44px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      background: #ffffff;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      padding: 0 10px;
      display: grid;
      place-items: center;
      touch-action: manipulation;
      transition: all 0.15s ease;
    }

    .m-pill.m-wrong { color: var(--lv1); border-color: rgba(239, 68, 68, 0.35); }
    .m-pill.m-wrong.active { background: var(--lv1); color: #ffffff; }
    .m-pill.m-vague { color: var(--lv3); border-color: rgba(245, 158, 11, 0.35); }
    .m-pill.m-vague.active { background: var(--lv3); color: #ffffff; }
    .m-pill.m-proficient { color: var(--lv5); border-color: rgba(16, 185, 129, 0.35); }
    .m-pill.m-proficient.active { background: var(--lv5); color: #ffffff; }

    /* ===== 英语词汇模块（现代蓝色毛玻璃体系与汉语释义） ===== */
    .app-layout.english-mode .sidebar-right,
    .app-layout.english-mode #chapterTitleBar { display:none; }
    .app-layout.english-mode .main-content { max-width:1140px; margin:0 auto; width:100%; }

    .english-panel { padding: 6px 4px 40px; }
    .english-head { display:flex; gap:16px; align-items:center; justify-content:space-between; margin-bottom:14px; flex-wrap:wrap; }
    .english-title-box h2 { margin:0; color:#0f2d59; font-size:22px; font-weight:750; letter-spacing:-0.02em; }
    .english-summary { display:flex; flex-wrap:wrap; gap:8px; color:#475569; font-size:13px; margin-top:5px; align-items:center; }
    .eng-stat-num.stat-fam { color:#087f5b; font-weight:700; }
    .eng-stat-num.stat-vag { color:#b26b00; font-weight:700; }
    .eng-stat-num.stat-wro { color:#c63d4a; font-weight:700; }

    .english-head-actions { display:flex; align-items:center; gap:8px; flex-wrap:wrap; }
    .english-action {
      border:1px solid rgba(47,128,237,0.22);
      border-radius:999px;
      padding:7px 15px;
      cursor:pointer;
      font:inherit;
      font-size:13px;
      font-weight:600;
      background:rgba(255,255,255,0.9);
      color:#1557a6;
      box-shadow:0 2px 8px rgba(15,45,89,0.05);
      transition:all 0.15s ease;
    }
    .english-action:hover {
      background:#2f80ed;
      color:#fff;
      border-color:#2f80ed;
      box-shadow:0 4px 12px rgba(47,128,237,0.22);
    }
    .english-back-btn {
      background:linear-gradient(180deg, #3d8bfd 0%, #2575dc 100%);
      color:#fff;
      border-color:transparent;
    }
    .english-back-btn:hover {
      background:#1557a6;
      color:#fff;
    }
    .english-toggle-cn.active {
      background:#ffedd5;
      color:#9a3412;
      border-color:#fdba74;
    }

    .english-toolbar { display:flex; gap:14px; align-items:center; justify-content:space-between; flex-wrap:wrap; margin-bottom:12px; }
    .english-tabs { display:flex; flex-wrap:wrap; gap:8px; }
    .english-tab {
      border:1px solid rgba(195,218,242,0.7);
      border-radius:999px;
      padding:7px 15px;
      cursor:pointer;
      font:inherit;
      font-size:13px;
      font-weight:600;
      background:rgba(255,255,255,0.8);
      color:#334155;
      transition:all 0.15s ease;
    }
    .english-tab:hover { background:#e8f3ff; color:#1557a6; }
    .english-tab.active { background:#2f80ed; color:#fff; border-color:#2f80ed; box-shadow:0 3px 10px rgba(47,128,237,0.25); }

    .english-search-wrapper { flex:1; min-width:240px; }
    .english-search-input {
      width:100%;
      padding:8px 16px;
      border:1px solid rgba(195,218,242,0.85);
      border-radius:999px;
      font:inherit;
      font-size:13px;
      background:rgba(255,255,255,0.92);
      box-shadow:inset 0 1px 3px rgba(0,0,0,0.03);
      transition:all 0.15s ease;
    }
    .english-search-input:focus {
      outline:none;
      border-color:#2f80ed;
      box-shadow:0 0 0 3px rgba(47,128,237,0.18);
      background:#fff;
    }

    .english-filter-chips { display:flex; gap:6px; flex-wrap:wrap; margin-bottom:14px; }
    .english-chip {
      border:1px solid rgba(195,218,242,0.65);
      border-radius:6px;
      padding:4px 11px;
      background:rgba(255,255,255,0.75);
      color:#475569;
      font-size:12px;
      font-weight:550;
      cursor:pointer;
      transition:all 0.12s ease;
    }
    .english-chip:hover { background:#eef6ff; color:#1557a6; }
    .english-chip.active { background:#0f2d59; color:#fff; border-color:#0f2d59; font-weight:650; }

    .english-form { display:grid; grid-template-columns:1fr auto; gap:10px; margin:0 0 16px; }
    .english-form input {
      min-width:0;
      padding:9px 14px;
      border:1px solid rgba(195,218,242,0.85);
      border-radius:12px;
      font:inherit;
      font-size:13px;
      background:rgba(255,255,255,0.9);
    }
    .english-form input:focus {
      outline:none;
      border-color:#2f80ed;
      box-shadow:0 0 0 3px rgba(47,128,237,0.15);
    }

    .english-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:14px; }
    .english-card {
      display:flex;
      flex-direction:column;
      justify-content:space-between;
      padding:16px;
      border-radius:16px;
      background:rgba(255,255,255,0.86);
      border:1px solid rgba(195,218,242,0.72);
      box-shadow:0 4px 16px rgba(15,45,89,0.05);
      backdrop-filter:blur(10px);
      -webkit-backdrop-filter:blur(10px);
      transition:transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    }
    .english-card:hover {
      transform:translateY(-2px);
      box-shadow:0 8px 22px rgba(15,45,89,0.09);
      border-color:rgba(47,128,237,0.45);
    }

    .english-card-top { display:flex; align-items:flex-start; justify-content:space-between; gap:8px; margin-bottom:8px; }
    .english-terms { display:flex; flex-wrap:wrap; gap:6px; }
    .english-term {
      padding:4px 9px;
      border-radius:6px;
      background:#e8f3ff;
      color:#1557a6;
      font-size:16px;
      font-weight:700;
      border:1px solid rgba(47,128,237,0.18);
      overflow-wrap:anywhere;
    }
    .english-badge {
      display:inline-flex;
      align-items:center;
      padding:2px 8px;
      border-radius:999px;
      background:#f1f5f9;
      color:#475569;
      font-size:11px;
      font-weight:600;
      white-space:nowrap;
    }

    .english-meaning {
      font-size:14.5px;
      font-weight:500;
      color:#1e293b;
      line-height:1.6;
      margin:6px 0 12px;
      padding:8px 12px;
      background:rgba(244,248,253,0.88);
      border-radius:8px;
      border-left:3.5px solid #2f80ed;
      transition:filter 0.2s ease, opacity 0.2s ease;
    }
    .english-list.hide-meaning .english-meaning {
      filter:blur(5.5px);
      user-select:none;
      cursor:pointer;
      background:rgba(241,245,249,0.92);
      color:#94a3b8;
    }
    .english-list.hide-meaning .english-meaning:hover,
    .english-list.hide-meaning .english-meaning.revealed {
      filter:none;
      user-select:auto;
      color:#1e293b;
      background:rgba(244,248,253,0.95);
    }

    .english-card-footer { display:flex; align-items:center; justify-content:space-between; gap:8px; flex-wrap:wrap; margin-top:auto; padding-top:6px; }
    .english-controls { display:flex; gap:6px; align-items:center; }
    .english-status {
      border:1px solid rgba(195,218,242,0.65);
      border-radius:999px;
      padding:5px 12px;
      font-size:12px;
      font-weight:600;
      cursor:pointer;
      background:#f8fafc;
      color:#64748b;
      transition:all 0.12s ease;
    }
    .english-status.familiar:hover { background:#dcfce7; color:#15803d; border-color:#bbf7d0; }
    .english-status.familiar.active { background:#dcfce7; color:#15803d; border-color:#86efac; font-weight:700; box-shadow:0 1px 4px rgba(22,128,60,0.15); }
    .english-status.vague:hover { background:#ffedd5; color:#c2410c; border-color:#fed7aa; }
    .english-status.vague.active { background:#ffedd5; color:#c2410c; border-color:#fdba74; font-weight:700; box-shadow:0 1px 4px rgba(194,65,12,0.15); }
    .english-status.wrong:hover { background:#fee2e2; color:#b91c1c; border-color:#fecaca; }
    .english-status.wrong.active { background:#fee2e2; color:#b91c1c; border-color:#fca5a5; font-weight:700; box-shadow:0 1px 4px rgba(185,28,28,0.15); }

    .english-actions-minor { display:flex; gap:8px; align-items:center; }
    .english-add-under, .english-edit-meaning, .english-delete {
      border:0;
      background:transparent;
      cursor:pointer;
      font-size:11.5px;
      font-weight:600;
      padding:4px 2px;
      transition:color 0.12s ease;
    }
    .english-add-under { color:#1557a6; }
    .english-add-under:hover { color:#2f80ed; text-decoration:underline; }
    .english-edit-meaning { color:#b26b00; }
    .english-edit-meaning:hover { color:#d97706; text-decoration:underline; }
    .english-delete { color:#94a3b8; }
    .english-delete:hover { color:#c63d4a; text-decoration:underline; }

    @media (max-width:820px) {
      .english-list { grid-template-columns:1fr; }
      .english-head { flex-direction:column; align-items:flex-start; }
      .english-head-actions { width:100%; justify-content:flex-start; }
      .english-toolbar { flex-direction:column; align-items:stretch; }
      .english-search-wrapper { width:100%; }
    }

    /* ===== 图片加载失败占位提示 ===== */
    .image-missing {
      min-height: 180px;
      width: 100%;
      display: grid;
      place-items: center;
      border: 1px dashed #cbd5e1;
      border-radius: 12px;
      background: #f8fafc;
      color: #64748b;
      font-size: 14px;
      padding: 24px;
      box-sizing: border-box;
      text-align: center;
      object-fit: contain;
    }

    /* ===== LaTeX 内容源 ===== */
    #latexQuestion,
    #latexSolution {
      width: 100%;
      color: var(--text);
      line-height: 1.8;
      word-break: break-word;
    }

    .latex-stem {
      font-size: 17px;
      margin-bottom: 18px;
    }

    .latex-options {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin: 12px 0 20px;
    }

    .latex-option {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      padding: 10px 12px;
      border: 1px solid var(--border);
      border-radius: 8px;
      background: var(--card-bg, #ffffff);
    }

    .latex-option-key {
      flex: 0 0 auto;
      color: var(--primary);
      font-weight: 700;
    }

    .latex-option-body,
    .latex-analysis,
    .latex-section-body {
      min-width: 0;
    }

    .latex-answer {
      display: inline-block;
      margin-bottom: 14px;
      padding: 5px 10px;
      color: #389e0d;
      background: #f6ffed;
      border: 1px solid #b7eb8f;
      border-radius: 6px;
      font-weight: 600;
    }

    .latex-solution-section {
      margin-top: 18px;
      padding: 12px 14px;
      border-radius: 8px;
      border: 1px solid var(--border);
      background: var(--bg-main, var(--card-bg, #f8faff));
    }

    .latex-solution-section h4 {
      margin: 0 0 8px;
      font-size: 14px;
      color: var(--text);
    }

    .latex-solution-section ul {
      margin: 0;
      padding-left: 22px;
    }

    .latex-wrong-option + .latex-wrong-option {
      margin-top: 8px;
    }

    /* LaTeX 题目没有图片质量标记，也不显示图片标注工具提示 */
    #mainAreaContent.latex-mode .btn-qbad-toggle,
    #mainAreaContent.latex-mode .btn-sbad-toggle,
    #mainAreaContent.latex-mode #qBadWarning,
    #mainAreaContent.latex-mode #sBadWarning {
      display: none !important;
    }

    #mainAreaContent.latex-mode #qAnnotWrap,
    #mainAreaContent.latex-mode #solutionImgs {
      display: none !important;
    }

    #mainAreaContent.latex-mode #latexQuestion,
    #mainAreaContent.latex-mode #latexSolution {
      display: block;
    }

    @media (max-width: 640px) {
      .latex-stem {
        font-size: 16px;
      }

      .latex-option {
        padding: 8px 10px;
      }
    }

/* ===== 蓝色毛玻璃工作台 ===== */
:root {
  --glass-blue: rgba(255, 255, 255, .66);
  --glass-blue-strong: rgba(255, 255, 255, .82);
  --glass-border: rgba(255, 255, 255, .56);
  --glass-shadow: 0 18px 45px rgba(24, 77, 137, .12);
  --glass-blur: blur(18px) saturate(132%);
}

body {
  background:
    radial-gradient(circle at 84% 0%, rgba(121, 183, 255, .20), transparent 31rem),
    radial-gradient(circle at 16% 84%, rgba(47, 128, 237, .10), transparent 27rem),
    #edf4fb;
}

.app-workbench {
  background: transparent;
}

.workbench-body {
  position: relative;
}

.account-bar {
  background: rgba(255, 255, 255, .70);
  border-bottom-color: rgba(174, 199, 226, .58);
  box-shadow: 0 8px 24px rgba(22, 76, 134, .07);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
}

.main-area {
  background: var(--glass-blue);
  border-color: var(--glass-border);
  box-shadow: var(--glass-shadow);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
}

.sidebar-right > * {
  background: rgba(255, 255, 255, .57);
  border-color: rgba(255, 255, 255, .58);
  box-shadow: 0 12px 30px rgba(24, 77, 137, .09);
  -webkit-backdrop-filter: blur(16px) saturate(130%);
  backdrop-filter: blur(16px) saturate(130%);
}

/* ===== 左侧导航：深海蓝玻璃层 + 环境装饰 ===== */
.sidebar-left {
  position: sticky;
  overflow: hidden;
  isolation: isolate;
  background:
    linear-gradient(165deg, rgba(18, 79, 153, .98) 0%, rgba(12, 46, 97, .99) 72%),
    #0c2e61;
  border-right: 1px solid rgba(255, 255, 255, .16);
  box-shadow: 8px 0 30px rgba(12, 46, 97, .14);
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.sidebar-left::before,
.sidebar-left::after {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
  border-radius: 50%;
}

.sidebar-left::before {
  width: 260px;
  height: 260px;
  top: -120px;
  right: -150px;
  background: radial-gradient(circle, rgba(121, 183, 255, .32), transparent 68%);
}

.sidebar-left::after {
  width: 300px;
  height: 300px;
  bottom: -180px;
  left: -170px;
  background: radial-gradient(circle, rgba(47, 128, 237, .25), transparent 69%);
}

.sidebar-ambient {
  position: absolute;
  z-index: -1;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.sidebar-orb {
  position: absolute;
  display: block;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 50%;
}

.sidebar-orb-one {
  width: 180px;
  height: 180px;
  top: 25%;
  right: -112px;
  box-shadow: 0 0 0 14px rgba(255, 255, 255, .025), 0 0 0 29px rgba(255, 255, 255, .018);
}

.sidebar-orb-two {
  width: 125px;
  height: 125px;
  bottom: 16%;
  left: -78px;
  box-shadow: 0 0 0 12px rgba(121, 183, 255, .06);
}

.sidebar-grid {
  position: absolute;
  top: 0;
  right: 0;
  width: 56%;
  height: 45%;
  opacity: .22;
  background-image:
    linear-gradient(rgba(255, 255, 255, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .12) 1px, transparent 1px);
  background-size: 22px 22px;
  -webkit-mask-image: linear-gradient(135deg, #000, transparent 74%);
  mask-image: linear-gradient(135deg, #000, transparent 74%);
}

.sidebar-brand,
.sidebar-scroll-container {
  position: relative;
  z-index: 1;
}

.sidebar-brand {
  margin: 12px 12px 8px;
  padding: 13px 13px 12px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 17px;
  background: rgba(255, 255, 255, .095);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .13), 0 12px 28px rgba(3, 25, 59, .14);
  -webkit-backdrop-filter: blur(18px) saturate(135%);
  backdrop-filter: blur(18px) saturate(135%);
}

.brand-logo-badge {
  width: 39px;
  height: 39px;
  color: #1557a6;
  background: linear-gradient(145deg, #fff, #dceeff);
  border: 1px solid rgba(255, 255, 255, .75);
  border-radius: 12px;
  box-shadow: 0 7px 16px rgba(3, 33, 78, .22);
}

.brand-logo-badge svg,
.nav-icon svg {
  display: block;
  width: 1em;
  height: 1em;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.brand-logo-badge svg {
  width: 22px;
  height: 22px;
}

.brand-title { letter-spacing: .6px; }
.brand-subtitle { color: rgba(218, 235, 255, .76); }

.sidebar-close-btn {
  color: rgba(255, 255, 255, .78);
}

.sidebar-scroll-container {
  padding: 8px 12px 18px;
  scrollbar-color: rgba(255, 255, 255, .26) transparent;
}

.sidebar-focus-card {
  position: relative;
  overflow: hidden;
  margin: 2px 0 18px;
  padding: 14px 14px 13px;
  border: 1px solid rgba(255, 255, 255, .20);
  border-radius: 15px;
  background: linear-gradient(140deg, rgba(121, 183, 255, .20), rgba(255, 255, 255, .065));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12), 0 11px 24px rgba(3, 25, 59, .13);
  -webkit-backdrop-filter: blur(16px) saturate(135%);
  backdrop-filter: blur(16px) saturate(135%);
}

.sidebar-focus-card::after {
  content: "";
  position: absolute;
  width: 90px;
  height: 90px;
  right: -45px;
  bottom: -46px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 50%;
}

.focus-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 9px;
}

.focus-card-kicker {
  color: rgba(207, 231, 255, .78);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .14em;
}

.focus-card-spark {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #8fc8ff;
  box-shadow: 0 0 0 5px rgba(143, 200, 255, .13), 0 0 16px rgba(143, 200, 255, .70);
}

.sidebar-focus-card strong {
  display: block;
  color: #fff;
  font-size: 14px;
  line-height: 1.45;
}

.sidebar-focus-card p {
  margin: 4px 0 11px;
  color: rgba(225, 239, 255, .77);
  font-size: 11px;
  line-height: 1.5;
}

.focus-card-line {
  height: 4px;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(255, 255, 255, .12);
}

.focus-card-line span {
  display: block;
  width: 42%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #8fc8ff, #d8edff);
}

.sidebar-focus-card small {
  display: block;
  margin-top: 8px;
  color: rgba(207, 231, 255, .64);
  font-size: 10px;
}

.nav-group {
  margin-bottom: 13px;
}

.nav-group-title {
  padding: 2px 9px 7px;
  color: rgba(206, 228, 255, .68);
  font-size: 10px;
  letter-spacing: .13em;
}

.sidebar-left .sol-default-btn {
  min-height: 40px;
  padding: 9px 11px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: rgba(242, 248, 255, .88);
  transition: background .18s ease, border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.sidebar-left .sol-default-btn:hover {
  background: rgba(255, 255, 255, .105);
  border-color: rgba(255, 255, 255, .12);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08);
  transform: translateX(2px);
}

.sidebar-left .sol-default-btn.active {
  position: relative;
  color: #fff;
  background: linear-gradient(105deg, rgba(121, 183, 255, .36), rgba(255, 255, 255, .14));
  border-color: rgba(200, 229, 255, .28);
  box-shadow: 0 8px 18px rgba(3, 29, 71, .19), inset 0 1px 0 rgba(255, 255, 255, .18);
}

.sidebar-left .sol-default-btn.active::before {
  content: "";
  position: absolute;
  top: 9px;
  bottom: 9px;
  left: -1px;
  width: 3px;
  border-radius: 0 4px 4px 0;
  background: #b9e0ff;
  box-shadow: 0 0 12px rgba(185, 224, 255, .9);
}

.sidebar-left .sol-default-btn .nav-icon {
  width: 22px;
  color: #a9d4ff;
  font-size: 19px;
  line-height: 1;
}

.sidebar-left .sol-default-btn.active .nav-icon { color: #fff; }
.sidebar-left .sol-default-btn .sol-key {
  background: rgba(255, 255, 255, .105);
  color: rgba(215, 235, 255, .70);
}
.sidebar-left .sol-default-btn.active .sol-key {
  background: rgba(255, 255, 255, .18);
  color: #fff;
}

.filter-toolbar,
.export-section {
  border-color: rgba(255, 255, 255, .17);
  background: rgba(255, 255, 255, .075);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .07);
  -webkit-backdrop-filter: blur(15px) saturate(130%);
  backdrop-filter: blur(15px) saturate(130%);
}

.filter-btn:hover,
.export-btn:hover {
  background: rgba(255, 255, 255, .12);
}

.filter-btn.active {
  background: rgba(255, 255, 255, .88);
  color: #123f70 !important;
  box-shadow: 0 4px 12px rgba(3, 29, 71, .13);
}

/* 现有全局 Hero 也统一成蓝色玻璃渐变 */
.db-hero-card {
  background: linear-gradient(135deg, rgba(103, 179, 255, .91), rgba(21, 87, 166, .96));
  border: 1px solid rgba(255, 255, 255, .28);
  box-shadow: 0 14px 28px rgba(30, 105, 196, .24), inset 0 1px 0 rgba(255, 255, 255, .22);
  -webkit-backdrop-filter: blur(16px) saturate(130%);
  backdrop-filter: blur(16px) saturate(130%);
}

/* ===== 新增学习分析区，蓝色版本 ===== */
.study-insights {
  --si-primary: #2f80ed;
  --si-primary-strong: #1557a6;
  --si-primary-soft: #e8f3ff;
  --si-mastered: #087f5b;
  --si-vague: #b26b00;
  --si-wrong: #c63d4a;
  --si-unmarked: #dbe8f6;
  width: 100%;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(420px, 1.35fr);
  gap: 16px;
  align-self: stretch;
  margin: 0 0 4px;
}
.study-insights,
.study-insights * { box-sizing: border-box; }
.si-card {
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, .72);
  border-radius: 18px;
  background: rgba(255, 255, 255, .70);
  box-shadow: 0 13px 32px rgba(25, 91, 159, .10), inset 0 1px 0 rgba(255, 255, 255, .85);
  -webkit-backdrop-filter: blur(18px) saturate(130%);
  backdrop-filter: blur(18px) saturate(130%);
}
.si-countdown-card {
  min-height: 174px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 26px;
}
.si-countdown-copy { min-width: 0; }
.si-card h3 { margin: 0; color: #1d3858; font-size: 18px; line-height: 1.35; font-weight: 750; }
.si-quote { max-width: 270px; margin: 9px 0 8px; color: #5f7897; font-size: 15px; line-height: 1.65; }
.si-link {
  appearance: none;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--si-primary-strong);
  font-size: 12px;
  font-weight: 750;
  cursor: pointer;
}
.si-link:hover { color: var(--si-primary); text-decoration: underline; }
.si-countdown-value {
  flex: 0 0 auto;
  min-width: 150px;
  padding: 12px 20px;
  border: 1px solid rgba(157, 190, 224, .62);
  border-radius: 18px;
  color: var(--si-primary-strong);
  text-align: center;
  background: rgba(255, 255, 255, .42);
  box-shadow: 0 4px 14px rgba(25, 91, 159, .07), inset 0 1px 0 rgba(255, 255, 255, .78);
}
.si-countdown-value strong { display: inline-block; font-size: 48px; line-height: 1; letter-spacing: -.04em; }
.si-countdown-value span { margin-left: 8px; color: #5d7390; font-size: 16px; font-weight: 700; }
.si-progress-card { min-height: 174px; display: flex; align-items: center; gap: 22px; padding: 20px 24px; }
.si-donut {
  position: relative;
  flex: 0 0 144px;
  width: 144px;
  height: 144px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--si-unmarked) 0 100%);
}
.si-donut::after { content: ""; position: absolute; inset: 8px; border-radius: 50%; background: rgba(255, 255, 255, .88); }
.si-donut-hole { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #1d3858; }
.si-donut-hole strong { color: var(--si-primary-strong); font-size: 25px; line-height: 1.1; }
.si-donut-hole span { margin-top: 3px; color: #7189a3; font-size: 11px; }
.si-progress-copy { min-width: 0; flex: 1; }
.si-progress-copy h3 { font-size: 18px; }
.si-muted { margin: 4px 0 0; color: #6e86a0; font-size: 12px; line-height: 1.5; }
.si-progress-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px 18px; margin-top: 12px; }
.si-progress-grid > div { min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.si-progress-grid span { color: #6d849e; font-size: 12px; }
.si-progress-grid strong { overflow: hidden; color: #294464; font-size: 15px; text-overflow: ellipsis; white-space: nowrap; }
.si-progress-grid .si-mastered { color: var(--si-mastered); }
.si-progress-grid .si-vague { color: var(--si-vague); }
.si-progress-grid .si-wrong { color: var(--si-wrong); }
.si-legend { display: flex; flex-wrap: wrap; gap: 7px 13px; margin-top: 12px; color: #6e8197; font-size: 11px; }
.si-legend span { display: inline-flex; align-items: center; gap: 4px; }
.si-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; }
.si-dot-mastered { background: var(--si-mastered); }
.si-dot-vague { background: var(--si-vague); }
.si-dot-wrong { background: var(--si-wrong); }
.si-dot-unmarked { background: var(--si-unmarked); }
.si-trend-card { grid-column: 1 / -1; padding: 20px 24px 16px; }
.si-card-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.si-chips { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.si-chips span { padding: 5px 11px; border-radius: 999px; background: var(--si-primary-soft); color: var(--si-primary-strong); font-size: 12px; font-weight: 750; white-space: nowrap; }
.si-chart {
  position: relative;
  height: 220px;
  display: grid;
  grid-template-columns: repeat(14, minmax(0, 1fr));
  align-items: end;
  gap: 8px;
  padding: 23px 8px 8px;
  overflow: visible;
  border-bottom: 1px solid rgba(172, 198, 223, .56);
  background: repeating-linear-gradient(to top, transparent 0, transparent calc(25% - 1px), rgba(177, 201, 224, .30) calc(25% - 1px), rgba(177, 201, 224, .30) 25%);
}
.si-bar-col { position: relative; z-index: 2; height: 100%; display: flex; align-items: flex-end; justify-content: center; min-width: 0; }
.si-bar-track { width: min(42px, 78%); height: 100%; display: flex; align-items: flex-end; justify-content: center; }
.si-bar { position: relative; width: 100%; min-height: 0; border-radius: 6px 6px 2px 2px; background: linear-gradient(180deg, #79b7ff 0%, #2f80ed 100%); transition: height .25s ease; }
.si-bar-value { position: absolute; top: -19px; left: 50%; color: #294464; font-size: 11px; font-weight: 750; transform: translateX(-50%); }
.si-average-line { position: absolute; z-index: 1; right: 8px; left: 8px; border-top: 1px dashed #2f80ed; pointer-events: none; }
.si-average-line span { position: absolute; top: -17px; left: 0; padding-right: 5px; background: rgba(255, 255, 255, .86); color: #246cc8; font-size: 10px; }
.si-chart-axis { display: grid; grid-template-columns: repeat(14, minmax(0, 1fr)); gap: 8px; padding: 8px 8px 0; color: #7087a0; font-size: 11px; text-align: center; }
.si-chart-axis span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.si-chart-empty { margin: 8px 0 0; color: #8194aa; font-size: 12px; text-align: center; }
.si-settings-modal { width: min(92vw, 420px); }
.si-date-label { display: flex; flex-direction: column; gap: 7px; margin-top: 16px; color: #45627f; font-size: 13px; font-weight: 700; }
.si-date-label input { width: 100%; min-height: 40px; padding: 8px 10px; border: 1px solid #b9cee4; border-radius: 9px; background: rgba(255, 255, 255, .75); color: #293f5b; font: inherit; font-weight: 500; }
.si-date-label input:focus { outline: 2px solid rgba(47, 128, 237, .22); border-color: var(--si-primary); }
.si-settings-help { margin: 9px 0 0; color: #7188a0; font-size: 12px; line-height: 1.55; }
.si-settings-actions { display: flex; justify-content: flex-end; gap: 9px; margin-top: 18px; }
.si-settings-actions .hero-action-btn:not(.primary) { background: rgba(232, 243, 255, .85); color: #3d5d7d; }

/* ===== 分科总进度：英语 / 数学 / 专业课 ===== */
.si-subject-progress-grid {
  grid-column: 1 / -1;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  min-width: 0;
}

.si-subject-progress-card {
  min-width: 0;
  min-height: 162px;
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr);
  align-items: center;
  gap: 14px 17px;
  padding: 18px 20px 16px;
}

.si-donut-compact {
  width: 108px;
  height: 108px;
  flex-basis: 108px;
  align-self: center;
  justify-self: center;
}

.si-donut-compact::after {
  inset: 7px;
}

.si-donut-compact .si-donut-hole strong {
  font-size: 22px;
}

.si-donut-compact .si-donut-hole span {
  margin-top: 2px;
  font-size: 10px;
}

.si-subject-progress-copy {
  min-width: 0;
}

.si-subject-progress-copy h3 {
  margin: 0;
  color: #1d3858;
  font-size: 17px;
  line-height: 1.35;
  font-weight: 750;
}

.si-subject-done {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 11px;
}

.si-subject-done strong {
  color: #1557a6;
  font-size: 18px;
  line-height: 1.2;
  font-weight: 800;
}

.si-subject-done span {
  color: #7a8fa6;
  font-size: 11px;
  line-height: 1.35;
}

.si-subject-status-row {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px 12px;
  min-width: 0;
  padding-top: 11px;
  border-top: 1px solid rgba(178, 201, 224, .42);
  color: #6f849b;
  font-size: 11px;
}

.si-subject-status-row > span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
}

.si-subject-status-row strong {
  color: #36516f;
  font-size: 11px;
  font-weight: 800;
}

@media (max-width: 620px) {
  .si-subject-progress-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .si-subject-progress-card {
    grid-template-columns: 92px minmax(0, 1fr);
    min-height: 0;
    padding: 16px 14px 14px;
    gap: 12px 14px;
  }

  .si-donut-compact {
    width: 92px;
    height: 92px;
    flex-basis: 92px;
  }

  .si-donut-compact .si-donut-hole strong {
    font-size: 20px;
  }

  .si-subject-status-row {
    gap: 7px 10px;
  }
}

/* 现有模态框也使用同一套玻璃层次 */
.subject-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(8, 39, 77, .34);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.subject-modal {
  border: 1px solid rgba(255, 255, 255, .68);
  background: rgba(255, 255, 255, .84);
  box-shadow: 0 22px 60px rgba(12, 46, 97, .24), inset 0 1px 0 rgba(255, 255, 255, .86);
  border-radius: 16px;
  padding: 28px 32px;
  max-width: 680px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  -webkit-backdrop-filter: blur(20px) saturate(130%);
  backdrop-filter: blur(20px) saturate(130%);
}

@media (max-width: 1120px) {
  .study-insights { grid-template-columns: 1fr; }
  .si-trend-card { grid-column: auto; }
}
@media (max-width: 620px) {
  .si-countdown-card,
  .si-progress-card { min-height: 0; padding: 16px 14px; }
  .si-countdown-card { align-items: flex-start; flex-direction: column; gap: 10px; }
  .si-countdown-value { align-self: stretch; min-width: 0; padding: 8px 14px; }
  .si-countdown-value strong { font-size: 32px; }
  .si-quote { max-width: 100%; font-size: 13px; line-height: 1.5; margin: 6px 0; }
  .si-progress-card { align-items: flex-start; flex-direction: column; gap: 14px; }
  .si-donut { align-self: center; }
  .si-trend-card { padding: 16px 12px 12px; }
  .si-card-header { flex-direction: column; }
  .si-chips { justify-content: flex-start; }
  .si-chart { gap: 3px; padding-right: 2px; padding-left: 2px; }
  .si-chart-axis { gap: 3px; padding-right: 2px; padding-left: 2px; font-size: 10px; }
  .si-bar-track { width: 80%; }
}

/* 移动端抽屉与汉堡菜单显隐 */
@media (max-width: 900px) {
  .mobile-menu-toggle { display: flex !important; }
}
@media (max-width: 768px) {
  .mobile-menu-toggle { display: flex !important; }
  .sidebar-left {
    position: fixed;
    left: -260px;
    top: 0;
    bottom: 0;
    width: 260px;
    flex: none;
    z-index: 1000;
    box-shadow: 4px 0 24px rgba(0, 0, 0, .25);
    transition: transform .25s cubic-bezier(.4, 0, .2, 1);
  }
  body.sidebar-open .sidebar-left { transform: translateX(260px); }
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .si-card,
  .main-area,
  .account-bar,
  .subject-modal { background: #fff; }
  .sidebar-focus-card,
  .filter-toolbar,
  .export-section { background: rgba(18, 79, 153, .98); }
}

/* ===== 只在题目工作台显示的右侧刷题栏 ===== */
.sidebar-right[hidden] {
  display: none !important;
}

/* ===== Header 每日小目标 ===== */
.daily-goal-widget {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 42px;
  padding: 4px 10px 4px 9px;
  border: 1px solid rgba(47, 128, 237, .18);
  border-radius: 999px;
  appearance: none;
  background: rgba(239, 247, 255, .78);
  color: #35516f;
  box-shadow: 0 2px 8px rgba(30, 100, 180, .06);
  font: inherit;
  font-family: inherit;
  cursor: pointer;
  transition:
    border-color .18s ease,
    background .18s ease,
    box-shadow .18s ease;
}

.daily-goal-widget:hover {
  border-color: rgba(47, 128, 237, .34);
  background: #f4f9ff;
  box-shadow: 0 4px 12px rgba(30, 100, 180, .09);
}

.daily-goal-widget:focus-visible {
  outline: 2px solid rgba(47, 128, 237, .28);
  outline-offset: 2px;
}

.daily-goal-title {
  color: #607a96;
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.daily-goal-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.daily-goal-ring {
  --goal-progress: 0%;
  --goal-color: #2f80ed;

  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background:
    conic-gradient(
      var(--goal-color) 0 var(--goal-progress),
      #dbe8f6 var(--goal-progress) 100%
    );
}

.daily-goal-ring::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: #fff;
}

.daily-goal-ring > span {
  position: relative;
  z-index: 2;
  color: #1557a6;
  font-size: 8px;
  line-height: 1;
  font-weight: 800;
}

.daily-goal-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 45px;
  line-height: 1.05;
  white-space: nowrap;
}

.daily-goal-copy strong {
  color: #36516f;
  font-size: 10px;
  font-weight: 800;
}

.daily-goal-copy span {
  color: #6f849b;
  font-size: 10px;
  font-weight: 650;
}

.daily-goal-item.is-complete .daily-goal-ring {
  --goal-color: #10b981;
}

.daily-goal-item.is-complete .daily-goal-ring > span,
.daily-goal-item.is-complete .daily-goal-copy strong,
.daily-goal-item.is-complete .daily-goal-copy span {
  color: #047857;
}

/* ===== 小庆祝 toast ===== */
.daily-goal-toast {
  position: fixed;
  top: 72px;
  right: 28px;
  z-index: 1400;
  max-width: min(360px, calc(100vw - 28px));
  padding: 10px 14px;
  border: 1px solid rgba(16, 185, 129, .22);
  border-radius: 12px;
  background: rgba(240, 253, 250, .96);
  color: #047857;
  box-shadow: 0 12px 28px rgba(15, 118, 110, .14);
  font-size: 13px;
  font-weight: 700;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition:
    opacity .18s ease,
    transform .18s ease;
}

.daily-goal-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.daily-goal-toast[hidden] {
  display: none !important;
}

/* ===== 设置弹窗中的每日目标 ===== */
.si-goal-fieldset {
  margin: 16px 0 0;
  padding: 14px;
  border: 1px solid rgba(185, 206, 228, .75);
  border-radius: 12px;
}

.si-goal-fieldset legend {
  padding: 0 6px;
  color: #45627f;
  font-size: 13px;
  font-weight: 800;
}

.si-goal-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.si-goal-label {
  display: flex;
  flex-direction: column;
  gap: 7px;
  color: #45627f;
  font-size: 13px;
  font-weight: 700;
}

.si-goal-label input {
  width: 100%;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid #b9cee4;
  border-radius: 9px;
  background: rgba(255, 255, 255, .75);
  color: #293f5b;
  font: inherit;
  font-weight: 600;
}

.si-goal-label input:focus {
  outline: 2px solid rgba(47, 128, 237, .22);
  border-color: var(--si-primary);
}

@media (max-width: 620px) {
  #syncStatus,
  .daily-goal-title {
    display: none;
  }

  .si-goal-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-nav-right {
    gap: 6px;
  }

  .daily-goal-widget {
    padding: 4px 6px;
    gap: 6px;
  }

  .daily-goal-copy {
    display: none;
  }

  .daily-goal-ring {
    width: 31px;
    height: 31px;
    flex-basis: 31px;
  }

  .daily-goal-ring > span {
    display: none;
  }

  .daily-goal-ring::before {
    content: attr(data-short);
    position: relative;
    z-index: 2;
    color: #1557a6;
    font-size: 10px;
    font-weight: 800;
  }

  .daily-goal-item.is-complete .daily-goal-ring::before {
    color: #047857;
  }

  .daily-goal-toast {
    top: 64px;
    right: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .daily-goal-widget,
  .daily-goal-toast {
    transition: none;
  }
}

/* ===== Dashboard layout v2：Hero 满行 + 快捷卡移位 + 书籍三列 ===== */

/* db-overview 当前是 align-items:center，所以 Hero 不写宽度会按内容收缩。
   这里只让 Hero 明确铺满，不改变其它现有分析卡/统计卡的宽度语义。 */
.db-overview > .db-hero-card {
  width: 100%;
  max-width: none;
  min-width: 0;
  align-self: stretch;
  box-sizing: border-box;
}

.db-hero-card .hero-content {
  flex: 1 1 auto;
  min-width: 0;
}

/* “今日复习计划 / 错题集中攻克”放到截图标出的上方位置。
   桌面端采用与书籍卡完全相同的 3 列轨道，只占前两格，
   不创建第三个空白 DOM 卡片。 */
.db-quick-grid {
  width: 100%;
  min-width: 0;
  align-self: stretch;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  align-items: stretch;
  margin: 0 0 24px;
}

.db-quick-grid .db-side-widget {
  min-width: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.db-quick-grid .widget-body {
  flex: 1 1 auto;
}

.db-quick-grid .widget-btn {
  margin-top: auto;
}

/* 书籍区不再被旧的 2fr + 1fr 两列布局挤压，整行铺满。 */
.db-books-section {
  width: 100%;
  min-width: 0;
  align-self: stretch;
}

.db-books-section .db-block-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.db-block-header-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.db-books-legend {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 12px;
  color: #64748b;
  line-height: 1.4;
}

.db-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.db-legend-item i,
.dot-mastered,
.dot-fuzzy,
.dot-wrong,
.dot-unmarked,
.legend-mastered,
.legend-fuzzy,
.legend-wrong,
.legend-unmarked {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-mastered,
.dot-mastered {
  background: #4A90E2 !important;
}

.legend-fuzzy,
.dot-fuzzy {
  background: #8B5CF6 !important;
}

.legend-wrong,
.dot-wrong {
  background: #EF4444 !important;
}

.legend-unmarked,
.dot-unmarked {
  background: #DCE6F4 !important;
}

/* 桌面端一行 3 张进度卡。 */
.db-books-section .db-grid {
  width: 100%;
  min-width: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.db-books-section .db-donut-card,
.book-progress-card,
.subject-progress-card,
.progress-card {
  min-width: 0;
  overflow: hidden;
}

/* drawDonut() / drawBookSegmentedDonut() 会给 canvas 写入 inline width/height:260px。
   在窄屏必须允许 CSS 把显示尺寸压小，否则 320/390px 可能横向溢出。
   intrinsic canvas 像素仍保留，视觉只做等比缩放。 */
.db-books-section .db-donut-card canvas,
.book-progress-card canvas,
.subject-progress-card canvas,
.progress-card canvas {
  display: block;
  width: 260px !important;
  max-width: 100% !important;
  height: auto !important;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

/* 中等桌面/平板：260px donut + 卡片 padding 不适合硬塞三列，改两列。 */
@media (max-width: 1199px) {
  .db-quick-grid,
  .db-books-section .db-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 手机：快捷卡与书籍卡都单列，避免横向滚动。 */
@media (max-width: 620px) {
  .db-quick-grid,
  .db-books-section .db-grid {
    grid-template-columns: 1fr;
  }

  .db-quick-grid {
    gap: 12px;
    margin-bottom: 18px;
  }
}

/* ===== Dashboard：薄弱章节 Top 3 ===== */

.db-weak-section {
  width: 100%;
  min-width: 0;
  margin: 0 0 24px;
}

.db-weak-section .db-block-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.db-weak-section .db-block-header-left {
  min-width: 0;
}

.db-weak-subject-block + .db-weak-subject-block {
  margin-top: 22px;
}

.db-weak-subject-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.db-weak-subject-header h4 {
  margin: 0;
  font-size: 16px;
  color: #183250;
}

.db-weak-subject-header span {
  font-size: 12px;
  color: #7a8ca5;
}

.db-weak-grid {
  display: grid;
  grid-template-columns:
    repeat(3, minmax(0, 1fr));
  gap: 16px;
  width: 100%;
  min-width: 0;
}

.db-weak-card {
  appearance: none;
  width: 100%;
  min-width: 0;
  border: 1px solid rgba(21, 87, 166, 0.14);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  padding: 16px;
  text-align: left;
  color: #17324f;
  font: inherit;
  cursor: pointer;
  box-shadow:
    0 8px 24px rgba(40, 78, 120, 0.07);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}

.db-weak-card:hover {
  transform: translateY(-2px);
  border-color: rgba(21, 87, 166, 0.3);
  box-shadow:
    0 12px 28px rgba(40, 78, 120, 0.11);
}

.db-weak-card:focus-visible {
  outline: 3px solid rgba(74, 144, 226, 0.34);
  outline-offset: 2px;
}

.db-weak-rank {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 26px;
  padding: 0 9px;
  margin-bottom: 12px;
  border-radius: 999px;
  background: rgba(74, 144, 226, 0.12);
  color: #1557a6;
  font-size: 12px;
  font-weight: 800;
}

.db-weak-meta {
  display: block;
  overflow: hidden;
  margin-bottom: 5px;
  color: #71839a;
  font-size: 12px;
  line-height: 1.45;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.db-weak-name {
  display: block;
  min-height: 44px;
  color: #16375b;
  font-size: 16px;
  line-height: 1.4;
}

.db-weak-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 13px;
}

.db-weak-metrics span {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 3px 8px;
  border-radius: 999px;
  background: #f4f7fb;
  color: #526982;
  font-size: 12px;
  line-height: 1.2;
}

.db-weak-empty {
  grid-column: 1 / -1;
  padding: 18px 20px;
  border: 1px dashed rgba(100, 116, 139, 0.28);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.62);
  color: #71839a;
  font-size: 13px;
  line-height: 1.6;
}

@media (max-width: 1199px) {
  .db-weak-grid {
    grid-template-columns:
      repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .db-weak-section {
    margin-bottom: 18px;
  }

  .db-weak-section .db-block-header {
    align-items: flex-start;
  }

  .db-weak-subject-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .db-weak-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .db-weak-card {
    padding: 14px;
  }

  .db-weak-name {
    min-height: 0;
  }
}