:root {
  --ink: #0F172A;
  --ink-2: #334155;
  --ink-3: #64748B;
  --ink-4: #94A3B8;
  --line: #E2E8F0;
  --line-2: #F1F5F9;
  --blue-900: #1E3A8A;
  --blue-600: #2563EB;
  --blue-50: #E8EDF7;
  --blue-25: #F5F8FD;
  --orange: #EA580C;
  --orange-50: #FFF7ED;
  --orange-900: #9A3412;
  --red: #B91C1C;
  --red-50: #FEF2F2;
  --green: #15803D;
  --green-50: #F0FDF4;
  --bg: #FFFFFF;
  --side: #FAFBFD;
  --radius: 10px;
  --maxw: 780px;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
  background: var(--bg);
  display: flex;
  min-height: 100vh;
}

/* ---------- 顶部进度条 ---------- */
.progress-top {
  position: fixed; top: 0; left: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue-600), var(--blue-900));
  z-index: 100; transition: width .25s ease;
}

/* ---------- 侧栏 ---------- */
.side {
  width: 300px; flex: 0 0 300px;
  background: var(--side);
  border-right: 1px solid var(--line);
  height: 100vh; position: sticky; top: 0;
  display: flex; flex-direction: column;
}

.side-head { padding: 26px 24px 18px; border-bottom: 1px solid var(--line); }
.side-head .brand { display: flex; align-items: center; gap: 10px; }
.side-head .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--orange); }
.side-head .name { font-size: 15px; font-weight: 600; color: var(--ink); letter-spacing: .5px; }
.side-head .sub { font-size: 12.5px; color: var(--ink-4); margin-top: 6px; }

.search { padding: 14px 18px 10px; }
.search input {
  width: 100%; padding: 9px 12px; font-size: 13.5px;
  border: 1px solid var(--line); border-radius: 8px;
  background: #fff; color: var(--ink); outline: none;
  font-family: inherit;
}
.search input:focus { border-color: var(--blue-600); }

.side-body { flex: 1; overflow-y: auto; padding: 6px 12px 24px; }
.side-body::-webkit-scrollbar { width: 6px; }
.side-body::-webkit-scrollbar-thumb { background: #DDE3EC; border-radius: 3px; }

.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 12px; border-radius: 7px;
  font-size: 13.5px; color: var(--ink-2); cursor: pointer;
  text-decoration: none; line-height: 1.5;
}
.nav-item:hover { background: #F0F4FA; }
.nav-item.active { background: var(--blue-50); color: var(--blue-900); font-weight: 600; }
.nav-item .no {
  flex: 0 0 26px; font-size: 12px; color: var(--ink-4);
  font-variant-numeric: tabular-nums;
}
.nav-item.active .no { color: var(--blue-600); }
.nav-item .t { flex: 1; }
.nav-item .ok { color: var(--green); font-size: 12px; }

.mod { margin-top: 14px; }
.mod-title {
  font-size: 12px; color: var(--ink-4); letter-spacing: 1px;
  padding: 8px 12px 4px; font-weight: 600;
}
.mod--link {
  display: block; padding: 8px 12px; font-size: 13px;
  color: var(--ink-2); text-decoration: none; border-radius: 7px;
}
.mod--link:hover { background: #F0F4FA; }

.side-foot {
  padding: 12px 18px; border-top: 1px solid var(--line);
  font-size: 12px; color: var(--ink-4);
  display: flex; justify-content: space-between; align-items: center;
}
.side-foot .pct { color: var(--blue-600); font-weight: 600; }

/* ---------- 主区 ---------- */
.main { flex: 1; min-width: 0; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 56px 40px 120px; }

.crumb { font-size: 12.5px; color: var(--ink-4); margin-bottom: 14px; letter-spacing: .5px; }

h1.page-title {
  font-size: 30px; line-height: 1.4; color: var(--ink);
  font-weight: 700; letter-spacing: -.2px;
}
.meta {
  display: flex; gap: 14px; align-items: center;
  margin-top: 14px; font-size: 12.5px; color: var(--ink-4);
}
.meta span { display: flex; align-items: center; gap: 5px; }

.rule { height: 1px; background: var(--line); margin: 26px 0 30px; }

/* 一句话结论 */
.conclusion {
  background: var(--blue-25);
  border-left: 3px solid var(--blue-600);
  border-radius: 0 8px 8px 0;
  padding: 18px 22px; margin-bottom: 34px;
}
.conclusion .lbl {
  font-size: 11.5px; color: var(--blue-600); letter-spacing: 1.5px;
  font-weight: 600; margin-bottom: 6px;
}
.conclusion p { font-size: 17px; color: var(--blue-900); line-height: 1.75; font-weight: 500; }

/* 正文 */
.body p { margin: 0 0 18px; font-size: 16px; line-height: 1.9; }
.body strong { color: var(--ink); font-weight: 600; }
.body h2 {
  font-size: 20px; color: var(--ink); font-weight: 700;
  margin: 42px 0 16px; padding-left: 12px;
  border-left: 3px solid var(--blue-900); line-height: 1.5;
}
.body h3 { font-size: 16.5px; color: var(--ink); font-weight: 600; margin: 28px 0 10px; }
.body ul, .body ol { margin: 0 0 20px; padding-left: 4px; list-style: none; }
.body ul li, .body ol li {
  position: relative; padding-left: 22px; margin-bottom: 11px;
  font-size: 16px; line-height: 1.85;
}
.body ul li::before {
  content: ""; position: absolute; left: 4px; top: 12px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--blue-600);
}
.body ol { counter-reset: n; }
.body ol li { counter-increment: n; padding-left: 30px; }
.body ol li::before {
  content: counter(n); position: absolute; left: 0; top: 2px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--blue-50); color: var(--blue-900);
  font-size: 11.5px; font-weight: 700; text-align: center; line-height: 20px;
}

blockquote {
  margin: 0 0 22px; padding: 16px 20px;
  background: var(--line-2); border-radius: var(--radius);
  font-size: 16px; color: var(--ink); line-height: 1.8;
}
blockquote::before {
  content: "「"; color: var(--ink-4);
}

/* 案例 */
.case {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; margin: 0 0 24px; background: #fff;
}
.case .tag {
  display: inline-block; font-size: 11.5px; color: var(--blue-900);
  background: var(--blue-50); padding: 2px 9px; border-radius: 4px;
  margin-bottom: 10px; letter-spacing: .5px;
}
.case p { margin-bottom: 10px; font-size: 15.5px; }
.case p:last-child { margin-bottom: 0; }

/* 警示 */
.warn {
  border-left: 3px solid var(--orange); background: var(--orange-50);
  border-radius: 0 8px 8px 0; padding: 16px 20px; margin: 0 0 24px;
}
.warn .tag {
  font-size: 11.5px; color: var(--orange-900); letter-spacing: 1px;
  font-weight: 600; margin-bottom: 6px;
}
.warn p { font-size: 15.5px; color: var(--orange-900); margin-bottom: 8px; }
.warn p:last-child { margin-bottom: 0; }

/* 表格 */
.tbl-wrap { margin: 0 0 26px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
th {
  background: var(--blue-900); color: #fff; font-weight: 600;
  padding: 11px 14px; text-align: left; font-size: 14px;
}
td { padding: 11px 14px; border-top: 1px solid var(--line); vertical-align: top; line-height: 1.7; }
tbody tr:nth-child(even) { background: #FBFCFE; }
td:first-child { color: var(--ink); font-weight: 500; }

/* 对照卡 */
.cards { display: flex; gap: 14px; margin: 0 0 26px; flex-wrap: wrap; }
.card {
  flex: 1 1 200px; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; background: #fff;
}
.card .ct { font-size: 14.5px; font-weight: 600; color: var(--blue-900); margin-bottom: 8px; }
.card .cd { font-size: 14.5px; color: var(--ink-3); line-height: 1.75; }

.compare { display: flex; gap: 0; margin: 0 0 26px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; flex-wrap: wrap; }
.compare > div { flex: 1 1 240px; padding: 18px 20px; }
.compare > div + div { border-left: 1px solid var(--line); }
.compare .ch { font-size: 13px; color: var(--ink-4); letter-spacing: 1px; margin-bottom: 6px; }
.compare .cb { font-size: 16px; font-weight: 600; color: var(--ink); margin-bottom: 12px; }
.compare ul { margin: 0; }
.compare li { font-size: 14.5px; padding-left: 16px; margin-bottom: 8px; position: relative; line-height: 1.7; }
.compare li::before { content: "·"; position: absolute; left: 4px; color: var(--ink-4); font-weight: 700; }
.compare .dark { background: var(--blue-900); }
.compare .dark .ch { color: #93B4E8; }
.compare .dark .cb { color: #fff; }
.compare .dark li { color: #D6E2F5; }
.compare .dark li::before { color: #93B4E8; }

/* 流程 */
.flow { display: flex; align-items: stretch; gap: 10px; margin: 0 0 26px; flex-wrap: wrap; }
.flow .fi {
  flex: 1 1 140px; background: var(--blue-50); border-radius: 8px;
  padding: 14px 16px; font-size: 14.5px; color: var(--blue-900);
  display: flex; flex-direction: column; gap: 4px;
}
.flow .fi b { font-size: 12px; color: var(--blue-600); }
.flow .fa { align-self: center; color: var(--ink-4); font-size: 16px; }

/* 自检 */
.check {
  background: var(--green-50); border: 1px solid #D7F0DF;
  border-radius: var(--radius); padding: 20px 22px; margin: 0 0 26px;
}
.check .tag { font-size: 12px; color: var(--green); font-weight: 600; letter-spacing: 1px; margin-bottom: 12px; }
.check li {
  list-style: none; position: relative; padding-left: 26px;
  font-size: 15px; line-height: 1.8; margin-bottom: 9px; color: #14532D;
}
.check li::before {
  content: ""; position: absolute; left: 0; top: 8px;
  width: 15px; height: 15px; border: 1.5px solid #86C79A; border-radius: 4px;
}

/* 视频 / 资源 */
.res { margin: 0 0 18px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.res-head { display: flex; gap: 14px; padding: 16px 18px; align-items: flex-start; }
.res-play {
  flex: 0 0 44px; height: 44px; border-radius: 50%;
  background: var(--blue-900); color: #fff; border: none; cursor: pointer;
  font-size: 15px; display: flex; align-items: center; justify-content: center;
  transition: background .15s;
}
.res-play:hover { background: var(--blue-600); }
.res-info { flex: 1; min-width: 0; }
.res-title { font-size: 15px; font-weight: 600; color: var(--ink); line-height: 1.5; }
.res-sub { font-size: 13px; color: var(--ink-4); margin-top: 5px; line-height: 1.6; }
.res-frame { border-top: 1px solid var(--line); background: #000; }
.res-frame iframe { display: block; width: 100%; height: 420px; border: 0; }
.res-link { display: block; padding: 16px 18px; text-decoration: none; }
.res-link:hover { background: var(--blue-25); }
.res-link .res-title { color: var(--blue-900); }

/* 底部导航 */
.pager {
  display: flex; gap: 14px; justify-content: space-between;
  margin-top: 56px; padding-top: 26px; border-top: 1px solid var(--line);
}
.pager a {
  flex: 1; text-decoration: none; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px 18px; transition: border-color .15s;
}
.pager a:hover { border-color: var(--blue-600); }
.pager .pl { font-size: 12px; color: var(--ink-4); }
.pager .pt { font-size: 14.5px; color: var(--ink); margin-top: 4px; line-height: 1.5; }
.pager .next { text-align: right; }

.done-bar { display: flex; justify-content: center; margin-top: 40px; }
.done-btn {
  padding: 11px 28px; border-radius: 999px; border: 1px solid var(--blue-600);
  background: #fff; color: var(--blue-900); font-size: 14.5px; cursor: pointer;
  font-family: inherit; transition: all .15s;
}
.done-btn:hover { background: var(--blue-50); }
.done-btn.is-done { background: var(--green); border-color: var(--green); color: #fff; }

/* 首页 */
.hero { padding: 8px 0 30px; }
.hero h1 { font-size: 38px; line-height: 1.35; color: var(--ink); font-weight: 700; letter-spacing: -.5px; }
.hero .lead { font-size: 17px; color: var(--ink-3); margin-top: 18px; line-height: 1.85; }
.hero .stats { display: flex; gap: 34px; margin-top: 28px; flex-wrap: wrap; }
.hero .stats div { font-size: 13px; color: var(--ink-4); }
.hero .stats b { display: block; font-size: 26px; color: var(--blue-900); font-weight: 700; line-height: 1.3; }

.mod-card {
  display: block; text-decoration: none;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; margin-bottom: 14px; transition: all .15s;
  background: #fff;
}
.mod-card:hover { border-color: var(--blue-600); transform: translateY(-1px); }
.mod-card .mh { display: flex; align-items: baseline; gap: 12px; }
.mod-card .mn { font-size: 13px; color: var(--blue-600); font-weight: 700; letter-spacing: 1px; }
.mod-card .mt { font-size: 18px; font-weight: 600; color: var(--ink); }
.mod-card .md { font-size: 14.5px; color: var(--ink-3); margin-top: 8px; line-height: 1.7; }
.mod-card .mm { font-size: 12.5px; color: var(--ink-4); margin-top: 10px; }

.note-box {
  border: 1px dashed #CBD5E1; border-radius: var(--radius);
  padding: 18px 22px; margin: 26px 0; background: #FCFDFE;
}
.note-box .tag { font-size: 12px; color: var(--ink-4); letter-spacing: 1px; margin-bottom: 8px; }
.note-box p { font-size: 15px; line-height: 1.8; margin-bottom: 8px; }
.note-box p:last-child { margin-bottom: 0; }

/* ---------- 测验 ---------- */
.quiz {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; padding: 4px 24px 22px; margin: 30px 0;
}
.quiz-bar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 0 14px; border-bottom: 1px solid var(--line-2);
  margin-bottom: 6px; position: sticky; top: 0; background: #fff; z-index: 2;
}
.quiz-bar span { font-size: 13px; color: var(--ink-4); }
.quiz-bar b { color: var(--blue-600); font-size: 15px; }
.quiz-bar .quiz-score b { color: var(--green); }

.quiz .q { padding: 20px 0; border-bottom: 1px solid var(--line-2); }
.quiz .q:last-of-type { border-bottom: none; }
.quiz .qt {
  font-size: 16px; line-height: 1.75; color: var(--ink); font-weight: 600;
  margin-bottom: 14px;
}
.quiz .qn {
  display: inline-block; font-size: 11.5px; font-weight: 700; letter-spacing: .5px;
  color: var(--blue-600); background: var(--blue-50);
  border-radius: 4px; padding: 2px 8px; margin-right: 10px; vertical-align: 2px;
}
.quiz .opts { display: flex; flex-direction: column; gap: 8px; }
.quiz .opt {
  display: flex; align-items: flex-start; gap: 12px; text-align: left;
  border: 1px solid var(--line); border-radius: 8px; background: #fff;
  padding: 11px 14px; cursor: pointer; font-family: inherit;
  font-size: 15px; line-height: 1.7; color: var(--ink-2);
  transition: all .13s;
}
.quiz .opt:hover:not(:disabled) { border-color: var(--blue-600); background: var(--blue-25); }
.quiz .opt .ol {
  flex: 0 0 auto; width: 22px; height: 22px; margin-top: 3px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); border-radius: 5px;
  font-size: 12px; font-weight: 700; color: var(--ink-3); background: #fff;
}
.quiz .opt.right { border-color: var(--green); background: var(--green-50); color: var(--ink); }
.quiz .opt.right .ol { border-color: var(--green); background: var(--green); color: #fff; }
.quiz .opt.wrong { border-color: var(--red); background: var(--red-50); }
.quiz .opt.wrong .ol { border-color: var(--red); background: var(--red); color: #fff; }
.quiz .opt:disabled { cursor: default; }

.quiz .why {
  margin-top: 12px; padding: 12px 16px; border-radius: 8px;
  background: var(--blue-25); border-left: 3px solid var(--blue-600);
}
.quiz .why .wt { font-size: 13px; font-weight: 700; margin-bottom: 4px; }
.quiz .why .wt.ok { color: var(--green); }
.quiz .why .wt.no { color: var(--red); }
.quiz .why p { font-size: 14.5px; line-height: 1.8; color: var(--ink-2); }

.quiz-result {
  margin-top: 18px; padding: 20px 22px; border-radius: var(--radius);
  background: var(--blue-50); text-align: center;
}
.quiz-result .qr-score { font-size: 26px; font-weight: 700; color: var(--blue-900); line-height: 1.3; }
.quiz-result .qr-verdict { font-size: 14.5px; color: var(--ink-2); margin-top: 6px; }

/* 必修 / 选修路线图 */
.route-grid { display: flex; gap: 14px; flex-wrap: wrap; margin: 20px 0 6px; }
.route {
  flex: 1 1 300px; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px; background: #fff;
}
.route.must { border-color: var(--blue-600); background: var(--blue-25); }
.route .rt { font-size: 16px; font-weight: 700; color: var(--ink); }
.route .rt i {
  display: inline-block; font-style: normal; font-size: 11px; letter-spacing: .5px;
  padding: 2px 8px; border-radius: 4px; margin-right: 8px; vertical-align: 2px;
  background: var(--blue-600); color: #fff;
}
.route.opt .rt i { background: var(--ink-4); }
.route .rd { font-size: 14px; color: var(--ink-3); margin-top: 8px; line-height: 1.8; }
.route ul { margin: 10px 0 0 18px; }
.route li { font-size: 14px; color: var(--ink-2); line-height: 1.85; }

/* 页脚 */
.foot {
  margin-top: 46px; padding-top: 18px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-4); line-height: 1.9;
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.foot a { color: var(--blue-600); text-decoration: none; }
.foot a:hover { text-decoration: underline; }

/* 移动端 */
.menu-btn {
  display: none; position: fixed; top: 12px; left: 12px; z-index: 200;
  width: 42px; height: 42px; border-radius: 8px; border: 1px solid var(--line);
  background: #fff; cursor: pointer; font-size: 18px; color: var(--ink);
}
@media (max-width: 900px) {
  .side {
    position: fixed; left: 0; top: 0; z-index: 150;
    transform: translateX(-100%); transition: transform .22s ease;
    box-shadow: 0 0 30px rgba(15,23,42,.12);
  }
  .side.open { transform: translateX(0); }
  .menu-btn { display: block; }
  .wrap { padding: 72px 22px 100px; }
  h1.page-title { font-size: 24px; }
  .hero h1 { font-size: 28px; }
  .res-frame iframe { height: 240px; }
  .compare > div + div { border-left: none; border-top: 1px solid var(--line); }
}

@media print {
  .side, .menu-btn, .done-bar, .pager, .progress-top { display: none !important; }
  .wrap { max-width: 100%; padding: 0; }
  body { font-size: 12pt; }
}