:root {
  --bg: #f5f7fb;
  --card: #fff;
  --ink: #1e293b;
  --muted: #64748b;
  --line: #e2e8f0;
  --primary: #2563eb;
  --primary-light: #dbeafe;
  --green: #16a34a;
  --green-light: #dcfce7;
  --red: #dc2626;
  --red-light: #fee2e2;
  --amber: #d97706;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --radius: 12px;
  --side-w: 220px;
  --side-collapsed-w: 64px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}
/* ===== 页面加载淡入过渡：消除跨文档跳转时的突兀感 ===== */
body.app-loading .app {
  opacity: 0;
}
body.app-loading.app-ready .app {
  opacity: 1;
  transition: opacity .22s ease;
}
code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  background: var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  color: var(--primary);
}
.app { display: grid; grid-template-columns: var(--side-w) 1fr; min-height: 100vh; transition: grid-template-columns .25s ease; }
.app.side-collapsed { grid-template-columns: var(--side-collapsed-w) 1fr; }
.side {
  position: sticky; top: 0; height: 100vh;
  background: rgba(255,255,255,.92);
  border-right: 1px solid var(--line);
  padding: 20px;
  display: flex; flex-direction: column;
  backdrop-filter: blur(10px);
  z-index: 100;
  overflow: hidden;
  transition: padding .25s ease;
}
.side-header {
  display: flex; align-items: center;
  min-height: 28px;
  margin-bottom: 28px;
  padding-left: 44px; /* 为左上角固定按钮让位，避免遮挡品牌名 */
}
.brand { font-size: 18px; font-weight: 700; color: var(--primary); text-decoration: none; cursor: pointer; }
.side-toggle {
  /* 视口固定：始终显示、位置不变，点击展开/收起侧边栏（同 trae 三条杠） */
  position: fixed;
  top: 14px; left: 14px;
  z-index: 300;
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow);
  color: var(--muted); cursor: pointer; font-size: 18px; line-height: 1;
  transition: all .15s;
}
.side-toggle:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }
.nav-btn {
  position: relative;
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 10px 14px; margin-bottom: 4px;
  border: none; background: none; text-align: left; cursor: pointer;
  font-size: 14px; color: var(--muted); border-radius: 8px;
  text-decoration: none;
  transition: color .15s, background .15s, padding .25s ease;
}
/* 展开态隐藏图标文字，避免与 .nav-btn-text 重复 */
.nav-btn::before {
  content: attr(data-icon);
  display: none;
  /* 绝对定位：图标脱离 flex 流，文字收缩时不再推动图标（消除果冻） */
  position: absolute;
  top: 0; bottom: 0; left: 0; right: 0;
  margin: auto;
  width: 28px; height: 22px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;    /* 与文字加粗一致，避免深浅不一 */
  line-height: 22px;   /* 固定行高，与文字一致，避免高度跳动 */
}
.nav-btn-text {
  white-space: nowrap;
  overflow: hidden;
  max-width: 200px;
  font-weight: 500;    /* 加黑一点 */
  line-height: 22px;   /* 固定行高，图标/文字切换时高度一致 */
  transition: opacity .25s ease, max-width .25s ease;
}
.nav-btn:hover { background: var(--primary-light); color: var(--primary); text-decoration: none; }
.nav-btn.active,
.nav-btn.active:hover { background: var(--primary); color: #fff; font-weight: 600; text-decoration: none; }

/* ===== 侧边栏推广区域（底部） ===== */
.side-promo {
  margin-top: auto;        /* 推到底部 */
  padding-top: 12px;
  border-top: 1px solid var(--line);
  display: flex; align-items: center; gap: 14px;  /* 标签与两图标统一等距 */
  flex-wrap: wrap;
  position: relative;
  transition: opacity .25s ease;
}
.side-promo-label {
  font-size: 12px; color: var(--muted);
  white-space: nowrap;
}
.side-promo-icon {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  color: var(--muted); cursor: pointer;
  transition: background .15s, color .15s;
}
/* 两个推广图标均匀分布（间距由父级统一 gap 控制，保持等距） */
.side-promo-icon:hover {
  background: var(--primary-light); color: var(--primary);
}
.side-promo-icon .promo-img {
  width: 18px; height: 18px; display: block;
  object-fit: contain;
}
/* 侧边栏推广弹窗：fixed 定位，脱离 aside（避免被 overflow:hidden 裁切） */
.side-promo-popup {
  display: none;
  position: fixed;
  background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 16px;
  box-shadow: 0 10px 25px rgba(0,0,0,.1); min-width: 190px;
  color: var(--ink); text-align: left; z-index: 200;
}
.side-promo-popup.show { display: block; }
.side-promo-title { font-size: 14px; font-weight: 600; margin-bottom: 10px; color: var(--primary); white-space: nowrap; }
.side-promo-row { font-size: 13px; color: var(--muted); margin-bottom: 6px; white-space: nowrap; }
.side-promo-btn {
  margin-top: 8px; background: var(--primary); color: #fff; border: none;
  padding: 5px 14px; border-radius: 6px; font-size: 13px; cursor: pointer;
  width: 100%; transition: background .15s;
}
.side-promo-btn:hover { background: #1d4ed8; }
.side-promo-btn + .side-promo-row { margin-top: 12px; }

/* 折叠态：保留图标（纵向排列），仅隐藏标签文字，加大纵向间距 */
.side.collapsed .side-promo { flex-direction: column; gap: 8px; }
.side.collapsed .side-promo-label { display: none; }

/* 侧边栏折叠状态（桌面端） */
.side.collapsed { width: var(--side-collapsed-w); padding: 16px 8px; }
.side.collapsed .brand { display: none; }
.side.collapsed .nav-btn { padding: 10px 2px; }
.side.collapsed .nav-btn::before { display: block; }
.side.collapsed .nav-btn-text {
  opacity: 0;
  max-width: 0;
  padding: 0;
  margin: 0;
}
.side.collapsed .nav-btn:hover { background: var(--primary-light); color: var(--primary); }
/* 折叠态下被激活的按钮：与展开态点击效果保持一致（防止 :hover 浅蓝覆盖深蓝） */
.side.collapsed .nav-btn.active,
.side.collapsed .nav-btn.active:hover { background: var(--primary); color: #fff; font-weight: 600; }
.main {
  padding: 28px 32px; max-width: 900px; width: 100%;
  margin: 0 auto;
  display: flex; flex-direction: column; gap: 20px;
}
.page { display: none; }
.page.active { display: block; }
h1 { font-size: 22px; margin-bottom: 4px; }
h2 { font-size: 17px; margin-bottom: 12px; }
.card {
  background: var(--card); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 20px; }
.stat-card {
  background: var(--card); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); text-align: center;
}
.stat-card .num { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 13px; color: var(--muted); margin-top: 4px; }
.btn {
  display: inline-block; padding: 8px 18px; border: none; border-radius: 8px;
  font-size: 14px; cursor: pointer; font-weight: 500;
  transition: all .15s; text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { opacity: .9; }
.btn-outline { background: var(--card); color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { opacity: .9; }
.btn-sm { padding: 4px 12px; font-size: 13px; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }
textarea, input, select {
  width: 100%; padding: 10px 14px; border: 1px solid var(--line);
  border-radius: 8px; font-size: 14px; font-family: inherit;
  transition: border-color .15s;
}
textarea:focus, input:focus, select:focus {
  outline: none; border-color: var(--primary);
}
textarea { min-height: 160px; resize: vertical; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; color: var(--muted); }
.bank-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px;
  margin-bottom: 8px; transition: all .15s;
}
.bank-item:hover { border-color: var(--primary); background: var(--primary-light); }
.bank-info .name { font-weight: 600; }
.rename-icon { cursor: pointer; font-size: 12px; opacity: .4; transition: opacity .15s; }
.rename-icon:hover { opacity: 1; }
.bank-info .meta { font-size: 13px; color: var(--muted); }
.question-card {
  border: 1px solid var(--line); border-radius: 10px;
  padding: 20px; margin-bottom: 14px;
}
.question-card .q-header { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.question-card .q-body { font-size: 15px; margin-bottom: 14px; white-space: pre-wrap; }
.question-image { margin-bottom: 14px; text-align: center; }
.question-image img {
  max-width: 100%; max-height: 400px; border-radius: 8px;
  border: 1px solid var(--line); object-fit: contain;
}
.option {
  display: block; padding: 10px 14px; margin-bottom: 6px;
  border: 1px solid var(--line); border-radius: 8px; cursor: pointer;
  transition: all .15s; font-size: 14px;
}
.option:hover { border-color: var(--primary); background: var(--primary-light); }
.option.selected { border-color: var(--primary); background: var(--primary-light); font-weight: 600; }
.option.correct { border-color: var(--green); background: var(--green-light); }
.option.wrong { border-color: var(--red); background: var(--red-light); }
.fill-input {
  width: 100%; padding: 10px 14px; border: 1px solid var(--line);
  border-radius: 8px; font-size: 16px; font-family: inherit;
  transition: border-color .15s;
}
.fill-input:focus { outline: none; border-color: var(--primary); }
.option.show-correct { border-color: var(--green); background: var(--green-light); }
.result-bar {
  display: flex; align-items: center; gap: 16px; padding: 16px;
  border-radius: 10px; margin-bottom: 16px;
}
.result-bar.correct { background: var(--green-light); color: var(--green); }
.result-bar.wrong { background: var(--red-light); color: var(--red); }
.analysis-box {
  background: #f8fafc; border: 1px solid var(--line);
  border-radius: 8px; padding: 14px; margin-top: 12px;
  font-size: 14px; color: var(--muted);
}
.progress-bar {
  height: 6px; background: var(--line); border-radius: 3px; margin-bottom: 16px;
}
.progress-bar .fill { height: 100%; background: var(--primary); border-radius: 3px; transition: width .3s; }
.empty-state { text-align: center; padding: 40px; color: var(--muted); }
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.toast {
  position: fixed; bottom: 24px; right: 24px;
  padding: 12px 20px; border-radius: 10px; font-size: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,.15); z-index: 999;
  animation: slideUp .3s ease;
}
.toast.ok { background: var(--green); color: #fff; }
.toast.warn { background: var(--red); color: #fff; }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.practice-summary { text-align: center; padding: 30px; }
.practice-summary .score { font-size: 48px; font-weight: 700; color: var(--primary); }
.practice-summary .detail { font-size: 14px; color: var(--muted); margin-top: 8px; }
.wrong-badge { background: var(--red); color: #fff; font-size: 12px; padding: 2px 8px; border-radius: 10px; margin-left: 6px; }
/* 题库题目列表展开 */
.question-list-container {
  border: 1px solid var(--line); border-top: none;
  border-radius: 0 0 10px 10px; background: #fafbfc;
  margin-top: -9px; margin-bottom: 8px; overflow: hidden;
}
.question-list-item {
  padding: 12px 16px; border-bottom: 1px solid var(--line);
}
.question-list-item:last-child { border-bottom: none; }
.ql-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 6px;
}
.ql-index { font-size: 13px; color: var(--muted); font-weight: 600; }
.ql-body { font-size: 14px; margin-bottom: 6px; white-space: pre-wrap; }
.ql-image-tag { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.ql-options { display: flex; gap: 6px; flex-wrap: wrap; }
.ql-opt {
  font-size: 12px; padding: 2px 8px; border-radius: 4px;
  background: #f1f5f9; color: var(--muted);
}
.ql-opt-ans { background: var(--green-light); color: var(--green); font-weight: 600; }
.ql-analysis { font-size: 13px; color: var(--muted); margin-top: 6px; }
.ql-actions { display: flex; gap: 6px; }
.ql-edit-form { padding: 4px 0; }
.ql-edit-form .form-group { margin-bottom: 10px; }
.ql-edit-form .form-group label { font-size: 12px; }
.ql-edit-form textarea { min-height: 48px; font-size: 13px; }
.text-center { text-align: center; }
.mt-12 { margin-top: 12px; }
.mb-12 { margin-bottom: 12px; }
.practice-topbar {
  display: flex; align-items: center;
  margin-bottom: 16px;
}
.practice-timer {
  font-size: 15px; font-weight: 600;
  color: var(--muted);
  user-select: none;
}
.practice-timer.warning { color: var(--red); }
.practice-timer.overtime { color: var(--amber); }
.practice-topbar .submit-btn {
  padding: 6px 16px; font-size: 13px;
  margin-left: auto;
}
.nav-prev-next { display: flex; gap: 8px; }
.nav-prev-next .btn { padding: 6px 14px; font-size: 13px; }
/* 答题卡 */
.answer-sheet-btn { white-space: nowrap; }
.answer-sheet-mask {
  display: none;
  position: fixed; inset: 0; z-index: 200;
  background: rgba(15, 23, 42, 0.5);
}
.answer-sheet-mask.show { display: flex; align-items: center; justify-content: center; padding: 16px; }
.answer-sheet {
  width: 100%; max-width: 460px;
  max-height: 82vh; overflow: auto;
  background: var(--card); border-radius: 14px;
  padding: 18px;
  box-shadow: 0 10px 40px rgba(0,0,0,.25);
}
.as-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.as-title { font-size: 17px; font-weight: 700; }
.as-stats { font-size: 13px; color: var(--muted); flex: 1; }
.as-close {
  border: none; background: var(--line); color: var(--ink);
  width: 28px; height: 28px; border-radius: 50%; cursor: pointer;
  font-size: 13px; line-height: 1;
}
.as-close:hover { background: var(--primary-light); }
.as-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}
.as-btn {
  border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg); color: var(--ink);
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  font-size: 13px; cursor: pointer; transition: background .15s;
}
.as-btn:hover { border-color: var(--primary); }
.as-btn.answered { background: var(--primary); border-color: var(--primary); color: #fff; }
.as-btn.blank { background: var(--bg); }
.as-btn.current { box-shadow: 0 0 0 2px var(--primary-dark); }
.as-legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--muted); }
.as-legend span { display: flex; align-items: center; gap: 5px; }
.as-dot { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.as-dot.answered { background: var(--primary); }
.as-dot.blank { background: var(--bg); border: 1px solid var(--line); }
.as-dot.current { box-shadow: 0 0 0 2px var(--primary-dark); }
@media (max-width: 480px) {
  .as-grid { grid-template-columns: repeat(6, 1fr); gap: 6px; }
}
/* 逐题回顾 */
.review-item {
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.review-item:last-child { border-bottom: none; }
.review-header {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 6px;
}
.review-num { font-weight: 600; font-size: 13px; color: var(--muted); }
.review-type-tag {
  font-size: 12px; color: var(--muted);
  background: var(--line); border-radius: 4px;
  padding: 0 6px; line-height: 20px;
}
.review-badge { font-size: 12px; font-weight: 600; margin-left: auto; }
.review-badge.correct { color: var(--green); }
.review-badge.wrong { color: var(--red); }
.review-body { padding-left: 4px; }
.review-question { font-size: 14px; margin-bottom: 4px; }
.review-answer, .review-correct { font-size: 13px; line-height: 1.8; }
.text-green { color: var(--green); }
.text-red { color: var(--red); }
.review-filter { display: flex; gap: 4px; }
.review-filter .btn { font-size: 12px; padding: 2px 10px; }
.review-analysis {
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
  padding: 8px 10px;
  background: var(--bg);
  border-radius: 6px;
}
/* 手机端适配 */
@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
  }
  .side {
    position: fixed; top: 0; left: 0; height: 100vh; height: 100dvh; width: 240px;
    transform: translateX(-100%); transition: transform .25s ease;
    box-shadow: 2px 0 12px rgba(0,0,0,.1);
    z-index: 200;
  }
  .side .side-header { padding-left: 44px; padding-top: max(0px, env(safe-area-inset-top)); }
  .side-toggle { top: max(14px, env(safe-area-inset-top)); }
  .side.open { transform: translateX(0); }
  .side-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.3); z-index: 199;
  }
  .side-overlay.show { display: block; }
  .main { padding: 52px 14px 16px; padding-top: max(52px, env(safe-area-inset-top)); max-width: 100%; }
  .stat-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .stat-card { padding: 12px 8px; }
  .stat-card .num { font-size: 22px; }
  .stat-card .label { font-size: 11px; }
  h1 { font-size: 19px; }
  .card { padding: 14px; }
  .bank-item { flex-direction: column; align-items: flex-start; gap: 8px; }
  .bank-item .btn-group {
    width: 100%;
    display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
  }
  .bank-item .btn-group .btn { justify-content: center; text-align: center; }
  .question-card { padding: 14px; }

  .practice-topbar {
    display: flex; align-items: center;
    flex-wrap: wrap; gap: 8px;
  }
  .practice-topbar .submit-btn { margin-left: auto; }
  .practice-timer { font-size: 14px; }
  .toast { bottom: 80px; right: 12px; left: 12px; text-align: center; }
}

/* 图片转 Base64 工具 */
.img-drop-zone {
  border: 2px dashed var(--line); border-radius: var(--radius);
  padding: 32px; text-align: center; cursor: pointer;
  transition: border-color .2s, background .2s;
}
.img-drop-zone:hover, .img-drop-zone.drag-over {
  border-color: var(--primary); background: var(--primary-light);
}
.img-drop-hint { font-size: 14px; color: var(--muted); pointer-events: none; }
.img-preview { margin-top: 12px; text-align: center; }
.img-preview img { max-width: 100%; max-height: 200px; border-radius: 8px; border: 1px solid var(--line); }
.img-info { font-size: 12px; color: var(--muted); margin-top: 6px; }
.img-output { margin-top: 12px; }
.img-output label { font-size: 13px; font-weight: 600; display: block; margin-bottom: 6px; }
.img-code-wrap { display: flex; gap: 8px; align-items: flex-start; }
.img-code-wrap textarea {
  flex: 1; font-size: 12px; font-family: monospace; padding: 8px;
  border: 1px solid var(--line); border-radius: 6px; resize: vertical;
  background: #f8fafc; word-break: break-all;
}
.img-code-wrap .btn { white-space: nowrap; }

/* 使用指南 */
.guide-loading { text-align: center; padding: 40px; color: var(--muted); }
.guide-category { margin-bottom: 24px; }
.guide-category h3 { font-size: 15px; color: var(--muted); margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.guide-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.guide-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; cursor: pointer; text-decoration: none;
  transition: box-shadow .15s, border-color .15s;
}
.guide-card:hover { border-color: var(--primary); box-shadow: var(--shadow); text-decoration: none; }
.guide-card-title { font-size: 15px; font-weight: 600; margin-bottom: 6px; color: var(--primary); }
.guide-card-summary { font-size: 13px; color: var(--muted); line-height: 1.5; }

.guide-article { width: 100%; margin: 0 auto; }
/* app.html 内嵌指南文章：约束宽度，复用正文卡片样式，与独立文章页观感一致 */
.guide-inline { max-width: 780px; margin: 0 auto; }
.guide-inline .guide-article-body,
.guide-inline .mt-wrap { box-sizing: border-box; }
.guide-article-body { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 28px; overflow-wrap: break-word; word-break: break-word; }
.guide-article-body h1 { font-size: 22px; margin: 20px 0 12px; }
.guide-article-body h1:first-child { margin-top: 0; }
.guide-article-body h2 { font-size: 17px; margin: 20px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.guide-article-body h3 { font-size: 15px; margin: 16px 0 8px; }
.guide-article-body p { font-size: 14px; line-height: 1.7; margin: 8px 0; }
.guide-article-body strong { font-weight: 600; }
.guide-article-body code {
  font-size: 13px; background: #f1f5f9; padding: 2px 6px; border-radius: 4px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
}
.guide-article-body pre {
  position: relative; background: #1e293b; color: #e2e8f0; padding: 14px 16px; border-radius: 8px;
  overflow-x: auto; font-size: 13px; line-height: 1.5; white-space: pre-wrap; word-break: break-word; margin: 10px 0;
}
.guide-article-body pre code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* 代码块 - 带复制按钮 */
.code-block { position: relative; margin: 10px 0; }
.code-block pre { margin: 0; }
.code-copy-btn {
  position: absolute; top: 8px; right: 8px;
  background: rgba(255,255,255,0.12); color: #e2e8f0;
  border: 1px solid rgba(255,255,255,0.2); border-radius: 4px;
  padding: 3px 10px; font-size: 12px; cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  font-family: inherit;
}
.code-copy-btn:hover { background: rgba(255,255,255,0.25); }
.code-copy-btn.copied { background: #22c55e; border-color: #22c55e; color: #fff; }

/* 行内代码链接 - 复制按钮 */
.url-copy-wrap { display: inline-flex; align-items: flex-start; gap: 6px; flex-wrap: wrap; vertical-align: middle; }
.url-copy-wrap code { word-break: break-all; }
.url-copy-btn {
  background: var(--primary); color: #fff; border: none; border-radius: 4px;
  padding: 1px 8px; font-size: 12px; cursor: pointer; font-family: inherit;
  flex-shrink: 0; line-height: 1.6;
}
.url-copy-btn:hover { opacity: .85; }
.url-copy-btn.copied { background: var(--green); }
.guide-article-body a {
  color: var(--primary); text-decoration: none;
  display: inline-block; padding: 4px 12px;
  border: 1px solid var(--primary); border-radius: 6px;
  font-size: 13px; transition: background .15s, color .15s;
}
.guide-article-body a:hover { background: var(--primary); color: #fff; }
.guide-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 10px 0; }
.guide-table-wrap table {
  width: 100%; border-collapse: collapse; font-size: 13px;
}
.guide-table-wrap th, .guide-table-wrap td {
  border: 1px solid var(--line); padding: 8px 12px; text-align: left;
}
.guide-table-wrap th { background: #f8fafc; font-weight: 600; }
.guide-article-body br { display: block; content: ''; margin-top: 4px; }

/* 练习设置 - 题型筛选（多选 checkbox） */
.type-filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: center;
}
.type-filter-group label {
  white-space: nowrap;
  cursor: pointer;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.type-filter-group input[type="checkbox"] {
  margin: 0;
  cursor: pointer;
}

@media (max-width: 768px) {
  .guide-grid { grid-template-columns: 1fr; }
  .guide-article { max-width: 100%; }
  .guide-article-body { padding: 14px; border-radius: 8px; }
  .guide-article-body pre { font-size: 12px; padding: 10px 12px; }
  .guide-article-body h1 { font-size: 19px; }
  .guide-article-body h2 { font-size: 16px; }
  .guide-table-wrap table { font-size: 12px; }
  .guide-table-wrap th, .guide-table-wrap td { padding: 6px 8px; }
}

@media (min-width: 769px) {
  .side-overlay { display: none; }
}

/* ===== 界面精修（品牌统一 & 控制台美化）===== */

/* 控制台标题区增加一点层次感 */
.page > h1 {
  font-weight: 700; letter-spacing: -0.01em;
}

/* 统计卡片：数字渐变 + 顶部细色条，更精致 */
.stat-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
}
.stat-card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), #7c3aed);
}
.stat-card .num {
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-card .label { margin-top: 6px; }

/* ===== 可折叠卡片（题库管理页）===== */
.collapse-card { overflow: hidden; }
.collapse-head {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; user-select: none;
  padding: 2px 0;
}
.collapse-head h2 { margin-bottom: 0; }
.collapse-arrow {
  display: inline-block;
  width: 8px; height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform .2s ease;
}
.collapse-card[data-state="open"] .collapse-arrow { transform: rotate(-135deg); }
.collapse-body {
  padding-top: 14px;
}
.collapse-card[data-state="close"] .collapse-body { display: none; }

/* 导入题库按钮等宽 */
.import-btn { flex: 1; min-width: 0; justify-content: center; text-align: center; }
@media (max-width: 768px) {
  .import-btn { flex: 1 1 100%; }
}

/* 数据备份按钮等宽：桌面端一行，手机端分两行（每行2个） */
#backup-actions .backup-btn { flex: 1; min-width: 0; justify-content: center; text-align: center; }
@media (max-width: 768px) {
  #backup-actions .backup-btn { flex: 1 1 calc(50% - 4px); }
}

/* 错题本工具栏：下拉拉长，按钮等宽；手机端下拉一行 + 三按钮一行 */
#wrong-toolbar { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
#wrong-bank-filter {
  width: auto; flex: 1 1 180px; min-width: 0;
  padding: 5px 12px; font-size: 13px; height: auto;
}
#wrong-toolbar .wrong-btn { flex: 1; min-width: 0; justify-content: center; text-align: center; }
@media (max-width: 768px) {
  #wrong-toolbar .wrong-btn { flex: 1 1 0; }
  #wrong-bank-filter { flex: 1 1 100%; }
}