/* ============================================================
   识玉学堂 · 样式表
   配色：青玉绿 / 米宣纸 / 描金
   ============================================================ */
:root {
  --jade-950: #12291f;
  --jade-900: #1d4a3a;
  --jade-700: #2e7d63;
  --jade-500: #4da583;
  --jade-300: #9cc8b4;
  --jade-100: #e6f0ea;
  --paper: #faf8f3;
  --paper-2: #f2eee5;
  --ink: #2c2f2c;
  --ink-soft: #5a6058;
  --gold: #b98a2f;
  --gold-soft: #e5d3a8;
  --red: #b04a3f;
  --line: #e3ded2;
  --shadow: 0 10px 30px rgba(29, 74, 58, .10);
  --shadow-lg: 0 18px 50px rgba(29, 74, 58, .16);
  --radius: 16px;
  --serif: 'Noto Serif SC', 'Songti SC', 'STSong', 'SimSun', serif;
  --sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 22px; }
.svg-tag { font-size: 11px; fill: #6b7f74; font-family: var(--sans); }
.svg-tag.strong { font-weight: 700; }
.svg-note { font-size: 11px; fill: #5a6058; }

/* ---------------- 顶部导航 ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250, 248, 243, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1120px; margin: 0 auto; padding: 10px 22px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; cursor: pointer; color: var(--jade-900); }
.brand-jade { width: 34px; height: 34px; color: var(--jade-700); }
.brand-name { font-family: var(--serif); font-size: 22px; font-weight: 700; letter-spacing: 2px; }
.brand-sub { font-size: 11px; color: var(--ink-soft); letter-spacing: 1px; margin-left: -4px; }
.nav { display: flex; gap: 4px; }
.nav button {
  background: none; border: none; padding: 9px 15px; border-radius: 10px;
  font-size: 15px; color: var(--ink-soft); transition: all .18s;
}
.nav button:hover { background: var(--jade-100); color: var(--jade-900); }
.nav button.active { background: var(--jade-900); color: #fff; font-weight: 600; }
.nav button.nav-cta { color: var(--gold); font-weight: 600; }
.nav button.nav-cta.active { background: var(--gold); color: #fff; }
.progress-rail { height: 3px; background: var(--paper-2); }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--jade-700), var(--gold)); transition: width .5s; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; font-size: 20px; padding: 4px 12px; color: var(--jade-900); }

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative; min-height: 560px; display: flex; align-items: center;
  overflow: hidden; border-radius: 0 0 28px 28px; margin-top: 2px;
}
.hero-media { position: absolute; inset: 0; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.04); }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(18, 41, 31, .93) 0%, rgba(29, 74, 58, .82) 42%, rgba(29, 74, 58, .25) 100%);
}
.hero-content {
  position: relative; max-width: 1120px; margin: 0 auto; padding: 72px 22px; width: 100%;
  color: #f3f7f4;
}
.hero-kicker {
  display: inline-block; font-size: 13px; letter-spacing: 3px;
  border: 1px solid rgba(255,255,255,.35); border-radius: 999px; padding: 5px 16px; margin-bottom: 20px;
  color: #d9e8de; background: rgba(255,255,255,.06);
}
.hero h1 { font-family: var(--serif); font-size: clamp(30px, 5vw, 52px); font-weight: 700; line-height: 1.3; margin-bottom: 16px; }
.hero h1 .accent { color: var(--gold-soft); }
.hero-lead { max-width: 640px; font-size: 16.5px; color: #dce8e0; margin-bottom: 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 38px; }
.btn {
  border: none; border-radius: 12px; padding: 12px 30px; font-size: 16px; font-weight: 600;
  transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-primary { background: var(--jade-700); color: #fff; }
.btn-gold { background: linear-gradient(120deg, #c99a3a, #a87d24); color: #fff; }
.btn-ghost { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.45); }
.btn-light { background: #fff; color: var(--jade-900); border: 1px solid var(--jade-300); }
.hero-stats { display: flex; gap: 42px; flex-wrap: wrap; }
.hero-stats div { text-align: left; }
.hero-stats b { display: block; font-family: var(--serif); font-size: 34px; color: var(--gold-soft); line-height: 1.2; }
.hero-stats span { font-size: 13px; color: #c3d5ca; letter-spacing: 1px; }

/* ---------------- 通用区块 ---------------- */
.sec-head { text-align: center; margin: 58px 0 28px; }
.sec-head h2 { font-family: var(--serif); font-size: 30px; color: var(--jade-950); margin-bottom: 6px; }
.sec-head p { color: var(--ink-soft); font-size: 15px; }
.page-hero { text-align: center; padding: 64px 22px 10px; }
.page-hero h1 { font-family: var(--serif); font-size: clamp(30px, 4vw, 42px); color: var(--jade-950); margin-bottom: 10px; }
.page-hero p { color: var(--ink-soft); max-width: 680px; margin: 0 auto; }
.page-hero.small { padding: 52px 22px 6px; }
.hint-line { text-align: center; color: var(--ink-soft); margin: 18px 0 40px; }
.hint-line b { color: var(--jade-700); }

/* 目标卡 */
.goal-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.goal-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; cursor: pointer; transition: transform .18s, box-shadow .18s;
}
.goal-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--jade-300); }
.goal-ico { font-size: 34px; margin-bottom: 12px; }
.goal-card h3 { font-family: var(--serif); font-size: 20px; color: var(--jade-900); margin-bottom: 10px; }
.goal-card p { font-size: 14.5px; color: var(--ink-soft); margin-bottom: 14px; }
.goal-link { color: var(--jade-700); font-weight: 600; font-size: 14px; }

/* 学习路径 */
.path-flow { display: flex; align-items: stretch; gap: 10px; flex-wrap: wrap; justify-content: center; }
.path-step {
  flex: 1; min-width: 170px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 18px; position: relative; text-align: left;
}
.path-step b {
  display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px;
  border-radius: 50%; background: var(--jade-100); color: var(--jade-900); font-size: 15px; margin-bottom: 8px;
}
.path-step h4 { font-family: var(--serif); font-size: 18px; color: var(--jade-950); }
.path-step p { font-size: 13px; color: var(--ink-soft); margin: 6px 0 8px; }
.path-step span { font-size: 12px; color: var(--gold); }
.path-step.hot { border-color: var(--gold); background: #fdf9ef; }
.path-step.hot b { background: var(--gold-soft); color: #7a5a14; }
.path-arrow { align-self: center; color: var(--jade-300); font-size: 20px; }

/* 工具条 */
.tool-strip {
  margin: 56px 0 60px; background: var(--jade-900); border-radius: 20px; padding: 34px 34px 26px; color: #e9f2ec;
}
.tool-strip h3 { font-family: var(--serif); font-size: 22px; margin-bottom: 18px; color: #fff; }
.tools { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.tool { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14); border-radius: 12px; padding: 12px 16px; }
.tool b { display: block; color: var(--gold-soft); font-size: 15px; }
.tool span { font-size: 12.5px; color: #c9dbd0; }

/* ---------------- 图鉴 ---------------- */
.atlas-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; margin-top: 34px; }
.jade-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  cursor: pointer; transition: transform .18s, box-shadow .18s;
}
.jade-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.jade-card .jc-media { height: 210px; overflow: hidden; position: relative; }
.jade-card .jc-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.jade-card:hover .jc-media img { transform: scale(1.06); }
.jc-tag {
  position: absolute; top: 12px; left: 12px; background: rgba(18,41,31,.78); color: #fff;
  border-radius: 999px; padding: 3px 14px; font-size: 12.5px; backdrop-filter: blur(4px);
}
.jc-body { padding: 18px 20px 20px; }
.jc-body h3 { font-family: var(--serif); font-size: 21px; color: var(--jade-950); }
.jc-body .en { font-size: 12px; color: var(--ink-soft); letter-spacing: .5px; }
.jc-stats { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.jc-stats span {
  background: var(--jade-100); color: var(--jade-900); font-size: 12px;
  border-radius: 8px; padding: 3px 10px;
}
.jc-look { font-size: 14px; color: var(--ink-soft); margin-top: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.jc-open { margin-top: 12px; color: var(--jade-700); font-weight: 600; font-size: 14px; }

/* 图鉴弹层 */
.modal-mask {
  position: fixed; inset: 0; background: rgba(18, 30, 24, .6); z-index: 200;
  display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px; overflow-y: auto;
  backdrop-filter: blur(3px);
}
.modal {
  background: var(--paper); border-radius: 20px; max-width: 860px; width: 100%;
  overflow: hidden; box-shadow: var(--shadow-lg); animation: pop .25s ease;
}
@keyframes pop { from { transform: translateY(24px); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 26px; background: var(--jade-900); color: #fff;
}
.modal-head h2 { font-family: var(--serif); font-size: 24px; }
.modal-head .en { font-size: 12px; color: #bcd6c8; }
.modal-close { background: rgba(255,255,255,.12); color: #fff; border: none; border-radius: 50%; width: 36px; height: 36px; font-size: 18px; }
.modal-body { padding: 26px; }
.modal-imgs { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 22px; }
.modal-imgs figure { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.modal-imgs img { height: 190px; width: 100%; object-fit: cover; }
.modal-imgs figcaption { font-size: 12.5px; color: var(--ink-soft); padding: 10px 12px; line-height: 1.6; }
.md-sec { margin-bottom: 20px; }
.md-sec h4 {
  font-family: var(--serif); font-size: 17px; color: var(--jade-900); margin-bottom: 8px;
  display: flex; align-items: center; gap: 8px;
}
.md-sec h4::before { content: ''; width: 4px; height: 16px; background: var(--gold); border-radius: 2px; }
.md-sec ul { padding-left: 20px; }
.md-sec li { font-size: 14.5px; margin-bottom: 5px; color: #3d423d; }
.param-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; font-size: 14px; }
.param-table th, .param-table td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.param-table th { background: var(--jade-100); color: var(--jade-900); width: 110px; font-weight: 600; }
.conf-item { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--red); border-radius: 10px; padding: 10px 14px; margin-bottom: 8px; font-size: 14px; }
.conf-item b { color: var(--red); }
.trap-box { background: #fbf3ea; border: 1px solid #e8cdb2; border-radius: 12px; padding: 14px 16px; font-size: 14px; }
.trap-box b { color: #9a6a1f; }

/* 对比表 */
.table-scroll { overflow-x: auto; margin-bottom: 50px; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; }
.cmp-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 780px; }
.cmp-table th { background: var(--jade-900); color: #fff; padding: 12px 14px; text-align: left; font-weight: 600; white-space: nowrap; }
.cmp-table td { padding: 11px 14px; border-bottom: 1px solid var(--line); }
.cmp-table tr:nth-child(even) td { background: #f7f9f6; }
.cmp-table tr:hover td { background: var(--jade-100); }
.cmp-table td:first-child { font-weight: 700; color: var(--jade-900); white-space: nowrap; }

/* ---------------- 方法页 ---------------- */
.method-flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-top: 34px; }
.method-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; position: relative; }
.method-card .step-badge {
  position: absolute; top: -14px; left: 20px; background: var(--gold); color: #fff;
  font-size: 12px; font-weight: 700; border-radius: 999px; padding: 3px 14px; letter-spacing: 1px;
}
.method-card h3 { font-family: var(--serif); font-size: 20px; color: var(--jade-950); margin: 6px 0 14px; }
.method-card .m-ico { font-size: 26px; }
.point { margin-bottom: 14px; }
.point b { display: block; color: var(--jade-700); font-size: 14.5px; margin-bottom: 3px; }
.point p { font-size: 13.5px; color: var(--ink-soft); }

.struct-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.struct-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.struct-card svg { width: 100%; height: auto; border-radius: 10px; }
.struct-card figcaption { font-size: 13px; color: var(--ink-soft); padding: 10px 6px 4px; text-align: center; }

.torch-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.torch-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.torch-card svg { width: 100%; height: auto; }

.warn-box {
  margin: 44px 0 30px; background: #fdf0ee; border: 1px solid #ecc8c2; border-radius: var(--radius); padding: 20px 24px;
}
.warn-box b { color: var(--red); font-size: 16px; }
.warn-box p { font-size: 14.5px; color: #6d4a44; margin-top: 8px; }

/* ---------------- 评级页 ---------------- */
.grade-block { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; margin-top: 26px; }
.grade-block > h3 { font-family: var(--serif); font-size: 22px; color: var(--jade-950); margin-bottom: 18px; }
.dim-row { display: grid; grid-template-columns: 130px 1fr 1fr 2.4fr; gap: 10px; align-items: center; padding: 12px 10px; border-bottom: 1px dashed var(--line); }
.dim-row:last-of-type { border-bottom: none; }
.dim-row .dim-name { font-weight: 700; color: var(--jade-900); }
.dim-row .dim-best { color: var(--jade-700); font-size: 13.5px; }
.dim-row .dim-worst { color: var(--red); font-size: 13.5px; }
.dim-row .dim-tips { font-size: 13.5px; color: var(--ink-soft); }
.dim-head { font-size: 12px; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 1px; }
.grade-formula {
  margin-top: 16px; background: var(--jade-100); border-radius: 10px; padding: 12px 16px;
  font-size: 14px; color: var(--jade-900);
}
.gen-list { list-style: none; }
.gen-list li { padding: 10px 0 10px 30px; position: relative; border-bottom: 1px dashed var(--line); font-size: 15px; }
.gen-list li:last-child { border-bottom: none; }
.gen-list li::before { content: '✓'; position: absolute; left: 4px; color: var(--jade-700); font-weight: 700; }
.gen-list b { color: var(--jade-900); }

.seed-ladder { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-top: 26px; }
.seed { border-radius: 14px; padding: 18px 14px; text-align: center; color: #fff; position: relative; overflow: hidden; }
.seed b { display: block; font-family: var(--serif); font-size: 19px; }
.seed span { display: block; font-size: 12px; opacity: .92; margin-top: 4px; }
.seed i { position: absolute; top: 10px; right: 10px; font-style: normal; font-size: 11px; background: rgba(255,255,255,.22); border-radius: 999px; padding: 2px 9px; }
.seed.glass { background: linear-gradient(150deg, #2f7d5b, #145c46); }
.seed.ice { background: linear-gradient(150deg, #55997d, #2e7d63); }
.seed.nuobic { background: linear-gradient(150deg, #79b198, #4da583); }
.seed.nuo { background: linear-gradient(150deg, #9cc8b4, #79b198); color: var(--jade-950); }
.seed.bean { background: linear-gradient(150deg, #c8dcd0, #a8c9b8); color: var(--jade-950); }

/* ---------------- 防骗页 ---------------- */
.fraud-section { margin-top: 34px; }
.fraud-section h3 {
  font-family: var(--serif); font-size: 21px; color: var(--jade-950); margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}
.fraud-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 18px; }
.fraud-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.fraud-card h4 { font-size: 16.5px; color: var(--ink); display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.risk-badge { font-size: 11.5px; border-radius: 999px; padding: 2px 11px; white-space: nowrap; }
.risk-high { background: #fbe9e6; color: #b04a3f; font-weight: 700; }
.risk-mid { background: #fdf3df; color: #9a6a1f; font-weight: 700; }
.fraud-card ul { margin: 10px 0 0 2px; list-style: none; }
.fraud-card li { font-size: 13.5px; color: var(--ink-soft); padding: 4px 0 4px 20px; position: relative; }
.fraud-card li::before { content: '▸'; position: absolute; left: 2px; color: var(--red); }

.cert-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.cert-step { background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--jade-700); border-radius: 12px; padding: 20px; }
.cert-step b { color: var(--jade-900); font-size: 15.5px; display: block; margin-bottom: 6px; }
.cert-step p { font-size: 13.5px; color: var(--ink-soft); }
.cert-note {
  margin-top: 18px; background: var(--jade-100); border-radius: 12px; padding: 16px 20px; font-size: 14px; color: var(--jade-950);
}
.redline-box { background: var(--jade-950); border-radius: var(--radius); padding: 28px 30px; margin-top: 34px; }
.redline-box h3 { font-family: var(--serif); color: var(--gold-soft); font-size: 22px; margin-bottom: 14px; }
.redline-box ol { list-style: none; counter-reset: rl; }
.redline-box li { counter-increment: rl; color: #dfeae2; font-size: 15px; padding: 9px 0 9px 44px; position: relative; border-bottom: 1px dashed rgba(255,255,255,.12); }
.redline-box li:last-child { border-bottom: none; }
.redline-box li::before {
  content: counter(rl); position: absolute; left: 0; top: 10px; width: 26px; height: 26px;
  background: var(--gold); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700;
}

.ab-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.ab-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.ab-card.good { border-top: 4px solid var(--jade-700); }
.ab-card.bad { border-top: 4px solid var(--red); }
.ab-card svg { width: 100%; height: auto; }
.ab-card figcaption { font-size: 13.5px; color: var(--ink-soft); padding: 10px 6px; }

.cert-demo { display: grid; grid-template-columns: 1.4fr 1fr; gap: 26px; align-items: center; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.cert-svg { width: 100%; height: auto; }
.cert-notes { list-style: none; }
.cert-notes li { font-size: 13.8px; color: var(--ink-soft); padding: 7px 0 7px 24px; position: relative; border-bottom: 1px dashed var(--line); }
.cert-notes li:last-child { border-bottom: none; }
.cert-notes li::before { content: '✓'; position: absolute; left: 2px; color: var(--jade-700); font-weight: 700; }
.cert-notes b { color: var(--jade-900); }

/* ---------------- 实训页 ---------------- */
.scoreboard { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin: 26px 0 8px; }
.score-cell { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; text-align: center; }
.score-cell b { display: block; font-family: var(--serif); font-size: 26px; color: var(--jade-900); }
.score-cell b.done { color: var(--jade-700); }
.score-cell span { font-size: 12.5px; color: var(--ink-soft); }

.train-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin: 22px 0 34px; }
.train-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; text-align: center; transition: transform .18s, box-shadow .18s; }
.train-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.train-card.grad { border-color: var(--gold); background: #fdfaf2; }
.train-no {
  width: 44px; height: 44px; margin: 0 auto 12px; border-radius: 12px;
  background: var(--jade-100); color: var(--jade-900); font-weight: 800; font-size: 19px;
  display: flex; align-items: center; justify-content: center; font-family: var(--serif);
}
.train-card.grad .train-no { background: var(--gold-soft); color: #7a5a14; }
.train-card h3 { font-family: var(--serif); font-size: 20px; color: var(--jade-950); margin-bottom: 6px; }
.train-card p { font-size: 13.5px; color: var(--ink-soft); margin-bottom: 16px; }

.quiz-shell { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 30px; box-shadow: var(--shadow); }
.quiz-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.quiz-top .q-count { font-weight: 700; color: var(--jade-900); font-size: 15px; }
.quiz-top .q-type { font-size: 13px; color: var(--ink-soft); }
.quiz-bar { height: 8px; background: var(--paper-2); border-radius: 999px; overflow: hidden; margin-bottom: 22px; }
.quiz-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--jade-700), var(--gold)); border-radius: 999px; transition: width .3s; }
.quiz-q { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 18px; line-height: 1.6; }
.quiz-img { width: 100%; max-height: 340px; object-fit: contain; border-radius: 14px; border: 1px solid var(--line); margin-bottom: 18px; background: #f4f2ec; }
.opts { display: grid; gap: 10px; }
.opt {
  text-align: left; border: 2px solid var(--line); background: #fdfdfb; border-radius: 12px;
  padding: 13px 18px; font-size: 15.5px; color: var(--ink); transition: all .15s; display: flex; gap: 10px; align-items: baseline;
}
.opt:hover:not(:disabled) { border-color: var(--jade-500); background: var(--jade-100); }
.opt .opt-key { font-weight: 800; color: var(--jade-700); min-width: 20px; }
.opt.correct { border-color: var(--jade-700); background: var(--jade-100); font-weight: 600; }
.opt.correct::after { content: '✓ 正确'; margin-left: auto; color: var(--jade-700); font-weight: 700; font-size: 13.5px; }
.opt.wrong { border-color: var(--red); background: #fbeae8; }
.opt.wrong::after { content: '✗'; margin-left: auto; color: var(--red); font-weight: 700; }
.opt:disabled { cursor: default; opacity: .92; }
.feedback {
  margin-top: 18px; border-radius: 12px; padding: 14px 18px; font-size: 14.5px; line-height: 1.7; display: none;
}
.feedback.show { display: block; }
.feedback.ok { background: var(--jade-100); color: var(--jade-950); border: 1px solid var(--jade-300); }
.feedback.no { background: #fdf0ee; color: #6d332c; border: 1px solid #ecc8c2; }
.feedback b { font-size: 15px; }
.quiz-actions { margin-top: 20px; display: flex; justify-content: flex-end; gap: 12px; }

.quiz-result { text-align: center; padding: 30px 10px; }
.quiz-result .big-score { font-family: var(--serif); font-size: 64px; color: var(--jade-900); line-height: 1.1; }
.quiz-result .verdict { font-size: 17px; color: var(--jade-700); font-weight: 700; margin-bottom: 6px; }
.quiz-result p { color: var(--ink-soft); font-size: 14.5px; max-width: 520px; margin: 8px auto 24px; }
.result-ring { width: 130px; height: 130px; margin: 0 auto 16px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 40px; font-weight: 800; font-family: var(--serif); color: #fff; }
.result-ring.pass { background: conic-gradient(var(--jade-700) calc(var(--p) * 1%), var(--paper-2) 0); }
.result-ring.fail { background: conic-gradient(var(--red) calc(var(--p) * 1%), var(--paper-2) 0); }
.result-ring > span { background: #fff; width: 104px; height: 104px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--jade-900); }

/* 模拟器 */
.sim-case { border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.sim-head { background: var(--jade-900); color: #fff; padding: 16px 22px; }
.sim-head h3 { font-family: var(--serif); font-size: 20px; }
.sim-head p { font-size: 13.5px; color: #c9dbd0; }
.sim-body { padding: 22px; }
.sim-log { display: grid; gap: 12px; margin-bottom: 16px; }
.sim-entry { border-left: 4px solid var(--jade-300); background: #f6f8f5; border-radius: 0 12px 12px 0; padding: 12px 16px; font-size: 14px; }
.sim-entry b { color: var(--jade-900); display: block; margin-bottom: 2px; }
.sim-entry .sim-res { color: var(--ink-soft); }
.sim-entry.right { border-left-color: var(--jade-700); background: var(--jade-100); }
.sim-entry.wrong2 { border-left-color: var(--red); background: #fdf0ee; }
.sim-tip { font-size: 12.5px; color: #7a6a4a; background: #fdf9ef; border: 1px dashed var(--gold-soft); border-radius: 8px; padding: 6px 12px; margin-top: 6px; display: inline-block; }

/* ---------------- 页脚 ---------------- */
.footer { background: var(--jade-950); color: #c9d8cf; margin-top: 70px; padding: 46px 0 26px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 30px; }
.footer h3 { font-family: var(--serif); color: var(--gold-soft); font-size: 18px; margin-bottom: 10px; }
.footer p { font-size: 13.5px; color: #a7bcb0; }
.footer a { color: var(--gold-soft); }
.credit-list { max-height: 200px; overflow-y: auto; background: rgba(255,255,255,.05); border-radius: 10px; padding: 12px 16px; margin-top: 10px; }
.credit-list p { font-size: 11.5px; padding: 3px 0; border-bottom: 1px dashed rgba(255,255,255,.1); }
.footer-note { text-align: center; color: #7d948a; font-size: 12.5px; margin-top: 34px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .cert-demo { grid-template-columns: 1fr; }
  .dim-row { grid-template-columns: 110px 1fr; }
  .dim-row .dim-head { display: none; }
  .dim-row .dim-best, .dim-row .dim-worst { grid-column: span 1; font-size: 12.5px; }
  .dim-row .dim-tips { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; padding: 10px 16px;
    box-shadow: var(--shadow-lg);
  }
  .nav.open { display: flex; }
  .nav-toggle { display: block; }
  .hero { min-height: 480px; }
  .hero-stats { gap: 26px; }
  .path-arrow { display: none; }
  .quiz-shell { padding: 20px 16px; }
  .modal-body { padding: 18px; }
}