/* style.css —— 极简风格：单一主色 + 中性灰 */
:root {
  --primary: #2563eb;
  --primary-light: #eff4ff;
  --text: #1f2329;
  --text-sub: #6b7280;
  --border: #e5e7eb;
  --bg: #f6f7f9;
  --card: #ffffff;
  --green: #16a34a;
  --red: #dc2626;
  --radius: 10px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  transition: background .25s, color .25s;
  touch-action: manipulation;
}
/* 触控友好：去除点按高亮与误选中 */
.btn, .opt, .nav-grid .cell, .ch-item, .subject-card, .back-link, .topbar nav a {
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none; user-select: none;
}
input, textarea { font-size: 16px; }  /* 防止 iOS 聚焦自动放大 */

/* ---------- 深色模式 ---------- */
html[data-theme="dark"] {
  --primary: #4d8dff;
  --primary-light: #1e2c4d;
  --text: #e5e7eb;
  --text-sub: #98a2b3;
  --border: #2b3140;
  --bg: #0f1218;
  --card: #161b24;
  --green: #4ade80;
  --red: #f87171;
}
html[data-theme="dark"] .topbar { background: #141926; border-color: var(--border); }
html[data-theme="dark"] .tag { background: var(--primary-light); color: var(--primary); }
html[data-theme="dark"] .tag.gray { background: #222834; color: var(--text-sub); }
html[data-theme="dark"] .tag.green { background: #0f2b1e; color: var(--green); }
html[data-theme="dark"] .tag.red { background: #33191c; color: var(--red); }
html[data-theme="dark"] .analysis, html[data-theme="dark"] .analysis-box,
html[data-theme="dark"] .review-item .analysis { background: #10141c; }
html[data-theme="dark"] .q-answer-input textarea { background: var(--card); color: var(--text); }
html[data-theme="dark"] .toast { background: #2a3142; color: #e5e7eb; }
html[data-theme="dark"] .ch-item:hover { background: #10141c; }
html[data-theme="dark"] .opt:hover { border-color: var(--primary); }

/* ---------- 顶栏 ---------- */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar .logo { font-size: 17px; font-weight: 700; cursor: pointer; }
.topbar .logo span { color: var(--primary); }
.topbar nav a {
  color: var(--text-sub);
  text-decoration: none;
  margin-left: 20px;
  font-size: 14px;
  cursor: pointer;
}
.topbar nav a:hover, .topbar nav a.active { color: var(--primary); }

.container { max-width: 1080px; margin: 0 auto; padding: 28px 20px 60px; }

/* ---------- 首页 ---------- */
.hero { text-align: center; padding: 36px 0 30px; }
.hero h1 { font-size: 26px; font-weight: 700; }
.hero p { color: var(--text-sub); margin-top: 8px; font-size: 14px; }

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 10px;
}
.subject-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: box-shadow .2s, border-color .2s;
}
.subject-card:hover { border-color: var(--primary); box-shadow: 0 4px 16px rgba(37,99,235,.10); }
.subject-card h3 { font-size: 17px; display: flex; align-items: center; gap: 10px; }
.subject-card .badge {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--primary-light); color: var(--primary);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700;
}
.subject-card p { color: var(--text-sub); font-size: 13px; margin: 10px 0 14px; min-height: 40px; }
.subject-card .meta { font-size: 12px; color: var(--text-sub); display: flex; gap: 14px; }
.subject-card .meta b { color: var(--text); font-weight: 600; }

.section-title { font-size: 16px; font-weight: 700; margin: 34px 0 14px; display: flex; align-items: center; gap: 8px; }
.section-title::before { content: ''; width: 4px; height: 16px; background: var(--primary); border-radius: 2px; }

/* ---------- 卡片 / 列表 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 14px;
}
.list-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 4px; border-bottom: 1px solid var(--border);
}
.list-row:last-child { border-bottom: none; }
.list-row .info { font-size: 14px; }
.list-row .info .sub { color: var(--text-sub); font-size: 12px; margin-top: 2px; }

.tag {
  display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 4px;
  background: var(--primary-light); color: var(--primary); margin-right: 6px;
}
.tag.gray { background: #f3f4f6; color: var(--text-sub); }
.tag.green { background: #ecfdf5; color: var(--green); }
.tag.red { background: #fef2f2; color: var(--red); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; border: 1px solid var(--border); background: var(--card);
  color: var(--text); font-size: 14px; padding: 8px 20px; border-radius: 8px;
  cursor: pointer; text-decoration: none; transition: all .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { opacity: .9; color: #fff; }
.btn.sm { padding: 4px 12px; font-size: 13px; }
.btn.danger:hover { border-color: var(--red); color: var(--red); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- 答题页 ---------- */
.exam-layout { display: grid; grid-template-columns: 1fr 260px; gap: 18px; align-items: start; }
@media (max-width: 860px) { .exam-layout { grid-template-columns: 1fr; } }
.exam-main { min-width: 0; }

/* 试题下方操作栏：上一题 / 解析 / 下一题（与题目分隔，随题目内容排布） */
.exam-bar {
  margin-top: 14px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 16px;
}
.exam-bar-inner {
  display: flex; justify-content: space-between; gap: 12px;
}
.exam-bar-inner .btn { flex: 1; max-width: 220px; text-align: center; padding: 10px 20px; }

/* 整卷答题页：按题型分组 */
.qgroup { margin-bottom: 8px; }
.qgroup-head {
  display: flex; align-items: center; gap: 10px;
  font-size: 16px; font-weight: 700; margin: 26px 0 12px;
}
.qgroup-head::before { content: ''; width: 4px; height: 18px; background: var(--primary); border-radius: 2px; }
.qgroup-count {
  font-size: 12px; font-weight: 500; color: var(--text-sub);
  background: var(--bg); border: 1px solid var(--border);
  padding: 1px 10px; border-radius: 20px;
}
.q-card.full { margin-bottom: 12px; }
.q-card.full .q-head { flex-wrap: wrap; }
.qnum-badge {
  width: 30px; height: 30px; border-radius: 8px; flex-shrink: 0;
  background: var(--primary-light); color: var(--primary);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800;
}
.qhead-tags { margin-left: 2px; }
.q-card.full .q-head .btn { margin-left: auto; }

/* 进度条 */
.prog-bar { height: 8px; background: var(--border); border-radius: 4px; margin-top: 10px; overflow: hidden; }
.prog-bar div { height: 100%; background: var(--primary); border-radius: 4px; transition: width .3s; }

/* 分类进度（按题型） */
.prog-type { margin-top: 10px; }
.prog-type-head { display: flex; justify-content: space-between; align-items: center; font-size: 12.5px; color: var(--text-sub); }
.prog-type-head b { color: var(--text); font-variant-numeric: tabular-nums; }
.mini-bar { height: 5px; background: var(--border); border-radius: 3px; margin-top: 4px; overflow: hidden; }
.mini-bar div { height: 100%; background: var(--primary); border-radius: 3px; transition: width .3s; }

/* ---------- 答题卡弹窗 ---------- */
.answer-card-mask {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .55);
  display: flex; align-items: center; justify-content: center;
  z-index: 110; padding: 20px;
}
.answer-card-modal {
  background: var(--card); border-radius: 12px;
  width: 100%; max-width: 560px; max-height: 86vh; overflow: auto;
  padding: 22px 24px; box-shadow: 0 10px 40px rgba(0, 0, 0, .18);
}
.answer-card-head {
  display: flex; align-items: center; gap: 14px;
  padding-bottom: 14px; border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.answer-card-title { font-size: 18px; font-weight: 700; }
.answer-card-legend { margin-left: auto; font-size: 12.5px; color: var(--text-sub); display: flex; gap: 14px; }
.answer-card-legend i {
  display: inline-block; width: 12px; height: 12px; border-radius: 3px;
  vertical-align: middle; margin-right: 5px;
  border: 1px solid var(--border);
}
.answer-card-legend i.legend-done { background: var(--primary); border-color: var(--primary); }
.answer-card-close {
  font-size: 24px; cursor: pointer; color: var(--text-sub);
  width: 30px; height: 30px; line-height: 30px; text-align: center;
  border-radius: 50%;
}
.answer-card-close:hover { background: var(--bg); color: var(--text); }
.answer-card-body { display: flex; flex-direction: column; gap: 16px; }
.card-block-head { font-size: 14px; font-weight: 700; margin-bottom: 8px; }
.answer-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 8px; }
.answer-cell {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--card); cursor: pointer; font-size: 14px;
  transition: all .12s; user-select: none;
}
.answer-cell.done { background: var(--primary); color: #fff; border-color: var(--primary); }
.answer-cell.current { outline: 2px solid var(--primary); outline-offset: 1px; font-weight: 700; }
.answer-cell:hover { border-color: var(--primary); }
.answer-cell.done:hover { opacity: .85; }
html[data-theme="dark"] .answer-cell.current { color: var(--text); }

@media (max-width: 480px) {
  .answer-card-modal { padding: 18px; }
  .answer-grid { grid-template-columns: repeat(6, 1fr); gap: 6px; }
}

/* ---------- 复习资料 ---------- */
.review-docs {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px;
  margin-bottom: 10px;
}
.review-doc-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; cursor: pointer; transition: border-color .15s, box-shadow .15s;
}
.review-doc-card:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(37, 99, 235, .12); }
.review-doc-title { font-size: 15px; font-weight: 700; line-height: 1.5; }
.review-doc-meta { color: var(--text-sub); font-size: 12.5px; margin-top: 8px; }

.review-point {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 10px; overflow: hidden;
}
.review-point-head {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 16px; cursor: pointer; user-select: none;
}
.review-point-head:hover { background: var(--bg); }
.review-point-no {
  width: 26px; height: 26px; border-radius: 7px; flex-shrink: 0;
  background: var(--primary-light); color: var(--primary);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800;
}
.review-point-title { font-size: 14.5px; font-weight: 600; flex: 1; }
.review-point-toggle { color: var(--text-sub); font-size: 13px; transition: transform .2s; }
.review-point.closed .review-point-toggle { transform: rotate(-90deg); }
.review-point-body {
  padding: 6px 18px 16px; border-top: 1px solid var(--border);
}
.review-point-body .md-p { margin: 8px 0; font-size: 14px; line-height: 1.8; }
.review-point-body .md-h { margin: 12px 0 6px; }
.review-point-body .md-h4 { font-size: 14.5px; }
.review-point-body .md-h5 { font-size: 14px; color: var(--text-sub); }
.review-point-body .md-ul, .review-point-body .md-ol { margin: 8px 0; padding-left: 22px; font-size: 14px; line-height: 1.8; }
.md-table {
  width: 100%; border-collapse: collapse; margin: 10px 0;
  font-size: 13px; line-height: 1.6;
}
.md-table th, .md-table td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
.md-table th { background: var(--bg); font-weight: 600; }

.q-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 28px; }
.q-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.q-head .qno { font-size: 15px; font-weight: 700; }
.q-stem { font-size: 15px; margin-bottom: 18px; white-space: pre-wrap; }

.q-options .opt {
  display: flex; gap: 10px; align-items: flex-start;
  border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 14px; margin-bottom: 10px; cursor: pointer; transition: all .12s;
}
.q-options .opt:hover { border-color: var(--primary); }
.q-options .opt.selected { border-color: var(--primary); background: var(--primary-light); }
.q-options .opt .letter { font-weight: 700; color: var(--primary); flex-shrink: 0; }
.q-options .opt input { margin-top: 4px; }

.q-answer-input textarea {
  width: 100%; min-height: 140px; border: 1px solid var(--border); border-radius: 8px;
  padding: 12px; font-size: 14px; font-family: inherit; resize: vertical;
}
.q-answer-input textarea:focus { outline: none; border-color: var(--primary); }
.analysis-box {
  margin-top: 18px; background: var(--bg); border: 1px dashed var(--border);
  border-radius: 8px; padding: 14px 18px; font-size: 13px;
}
.analysis-box .ans-line { margin-top: 6px; }
.analysis-box .ans-line b { font-weight: 600; }
.analysis-box .analysis-text {
  margin-top: 10px; color: var(--text-sub); white-space: pre-wrap;
  border-top: 1px dashed var(--border); padding-top: 10px;
}

/* 右侧栏 */
.side-panel { position: sticky; top: 76px; }
.side-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 14px; }
.timer { font-size: 26px; font-weight: 700; text-align: center; letter-spacing: 2px; font-variant-numeric: tabular-nums; }
.timer.warn { color: var(--red); }
.timer-label { text-align: center; color: var(--text-sub); font-size: 12px; margin-top: 2px; }

.nav-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-top: 12px; }
.nav-group { margin-bottom: 12px; }
.nav-group:last-child { margin-bottom: 0; }
.nav-group-label { font-size: 12px; color: var(--text-sub); font-weight: 600; margin-bottom: 6px; }
.nav-group .nav-grid { margin-top: 0; }
.nav-grid .cell {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: 6px; font-size: 13px; cursor: pointer;
  background: var(--card);
}
.nav-grid .cell.done { background: var(--primary); color: #fff; border-color: var(--primary); }
.nav-grid .cell.current { outline: 2px solid var(--primary); outline-offset: 1px; }

.side-legend { display: flex; gap: 14px; font-size: 12px; color: var(--text-sub); margin-top: 10px; }
.side-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; }

/* 暂停遮罩 */
.pause-mask {
  position: fixed; inset: 0; background: rgba(17,24,39,.55);
  display: flex; align-items: center; justify-content: center; z-index: 100;
}
.pause-box { background: var(--card); border-radius: 14px; padding: 40px 56px; text-align: center; }
.pause-box h3 { font-size: 20px; margin-bottom: 8px; }
.pause-box p { color: var(--text-sub); font-size: 13px; margin-bottom: 22px; }

/* ---------- 成绩报告 ---------- */
.report-hero { display: flex; gap: 32px; align-items: center; flex-wrap: wrap; }
.score-circle {
  width: 130px; height: 130px; border-radius: 50%; flex-shrink: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 8px solid var(--primary);
}
.score-circle .num { font-size: 34px; font-weight: 800; line-height: 1.1; }
.score-circle .lbl { font-size: 12px; color: var(--text-sub); }
.score-circle.pass { border-color: var(--green); }
.score-circle.fail { border-color: var(--red); }

.report-meta { flex: 1; min-width: 240px; }
.report-meta h2 { font-size: 20px; margin-bottom: 8px; }
.report-meta .row { color: var(--text-sub); font-size: 13px; margin-top: 4px; }
.report-meta .row b { color: var(--text); }

.stat-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.stat-table th, .stat-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.stat-table th { color: var(--text-sub); font-weight: 500; font-size: 13px; }
.stat-table td.num { font-variant-numeric: tabular-nums; }

.review-item { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 22px; margin-bottom: 12px; background: var(--card); }
.review-item .head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; flex-wrap: wrap; gap: 6px; }
.review-item .stem { font-size: 14px; white-space: pre-wrap; margin-bottom: 10px; }
.review-item .ans-line { font-size: 13px; margin-top: 6px; }
.review-item .ans-line b { font-weight: 600; }
.review-item .ok { color: var(--green); }
.review-item .bad { color: var(--red); }
.review-item .analysis {
  margin-top: 10px; background: var(--bg); border-radius: 8px;
  padding: 10px 14px; font-size: 13px; color: var(--text-sub);
}
.review-item .options-recap { font-size: 13px; color: var(--text-sub); margin: 6px 0; }
.review-item .options-recap div { margin-top: 2px; }

.empty { text-align: center; color: var(--text-sub); padding: 60px 0; font-size: 14px; }

/* 返回链接 */
.back-link { color: var(--text-sub); font-size: 13px; cursor: pointer; display: inline-block; margin-bottom: 16px; }
.back-link:hover { color: var(--primary); }

/* ---------- 章节测试 ---------- */
.ch-item {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 4px; border-bottom: 1px solid var(--border);
  cursor: pointer; font-size: 14px;
}
.ch-item:last-child { border-bottom: none; }
.ch-item:hover { background: var(--bg); }
.ch-item input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }
.ch-counts { color: var(--text-sub); font-size: 12px; margin-left: auto; }

/* 题型模块卡片 */
.module-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px;
}
.module-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 16px; text-align: center; cursor: pointer;
  transition: border-color .15s, box-shadow .15s;
}
.module-card:hover { border-color: var(--primary); box-shadow: 0 3px 12px rgba(37, 99, 235, .12); }
.module-card.empty { opacity: .45; cursor: not-allowed; }
.module-card.empty:hover { border-color: var(--border); box-shadow: none; }
.module-name { font-size: 15px; font-weight: 700; }
.module-count { color: var(--text-sub); font-size: 13px; margin-top: 6px; }

/* 练习模式：对错反馈 */
.ok-banner {
  margin-top: 16px; background: #ecfdf5; border: 1px solid var(--green);
  color: var(--green); border-radius: 8px; padding: 12px 16px;
  font-size: 14px; text-align: center; font-weight: 600;
}
html[data-theme="dark"] .ok-banner { background: #0f2b1e; }
.q-options .opt.correct { border-color: var(--green); background: #ecfdf5; color: var(--green); }
.q-options .opt.wrong { border-color: var(--red); background: #fef2f2; color: var(--red); }
.q-options .opt.dim { opacity: .55; }
.q-options .opt.correct, .q-options .opt.wrong { pointer-events: none; }
html[data-theme="dark"] .q-options .opt.correct { background: #0f2b1e; color: var(--green); }
html[data-theme="dark"] .q-options .opt.wrong { background: #33191c; color: var(--red); }
.q-answer-input textarea:disabled { opacity: .7; }

/* 自动交卷提示 */
.toast {
  position: fixed; top: 70px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: #fff; padding: 10px 22px; border-radius: 8px;
  font-size: 14px; z-index: 200; opacity: 0; transition: opacity .3s; pointer-events: none;
}
.toast.show { opacity: .95; }
.toast.warn { background: #dc2626; color: #fff; }
html[data-theme="dark"] .toast.warn { background: #b91c1c; }

/* ---------- 手机端顶部常驻条（计时/进度/暂停） ---------- */
.m-topbar {
  display: none; align-items: center; justify-content: space-between; gap: 8px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 8px 12px; margin-bottom: 12px;
  font-size: 12.5px; color: var(--text-sub);
  position: sticky; top: 56px; z-index: 40;
  flex-wrap: wrap; row-gap: 6px;
}
.m-topbar b { color: var(--text); font-variant-numeric: tabular-nums; }
.m-topbar b.warn { color: var(--red); }
.m-topbar .btn { min-height: 30px; padding: 3px 12px; font-size: 12.5px; }

/* ---------- 手机端适配 ---------- */
@media (max-width: 860px) {
  .container { padding: 14px 12px 48px; }
  .topbar { height: 50px; padding: 0 10px; }
  .topbar .logo { font-size: 15px; }
  .topbar .logo span { display: none; }          /* 窄屏隐藏副标题 */
  .topbar nav a { margin-left: 12px; padding: 10px 2px; }

  .hero { padding: 22px 0 16px; }
  .hero h1 { font-size: 21px; }
  .subject-grid { grid-template-columns: 1fr; }

  .exam-layout { grid-template-columns: 1fr; gap: 12px; }
  .m-topbar { display: flex; }
  .q-card { padding: 18px 14px; }
  .q-head { flex-wrap: wrap; gap: 6px; }
  .q-stem { font-size: 15.5px; }
  .q-options .opt { padding: 13px 14px; min-height: 44px; font-size: 15px; }
  .q-answer-input textarea { min-height: 160px; }

  .exam-bar { margin-top: 12px; padding: 10px 12px; }
  .exam-bar-inner .btn { flex: 1; max-width: none; min-height: 44px; padding: 10px 0; font-size: 15px; }
  .btn { min-height: 40px; }
  .btn.sm { min-height: 34px; padding: 4px 12px; }

  .side-panel { position: static; }
  .side-card { padding: 14px; }
  .timer { font-size: 21px; }
  .nav-grid { grid-template-columns: repeat(6, 1fr); gap: 6px; }
  .nav-grid .cell { font-size: 12.5px; }

  .report-hero { gap: 18px; justify-content: center; text-align: center; }
  .report-meta { min-width: 0; }
  .stat-table th, .stat-table td { padding: 8px 6px; font-size: 13px; }
  .review-item { padding: 14px; }
  .analysis-box { padding: 12px 14px; }

  .pause-box { padding: 32px 26px; max-width: 88vw; }
  .toast { max-width: 90vw; text-align: center; white-space: normal; }
  .ch-item { padding: 13px 4px; }
}