/* Series palette follows lessons 01–02. Content is copied from the legacy slides. */
:root{--bg:#12161b;--surface:#1a2028;--surface-2:#212a34;--ink:#eef1f5;--text:#eef1f5;--ink-soft:#a7b0bd;--muted:#a7b0bd;--accent:#e2a84f;--accent-2:#4fb3a9;--accent-soft:#3a3120;--teal:#4fb3a9;--teal-soft:#1c2c2a;--blue-soft:#212a34;--amber:#e2a84f;--amber-soft:#3a3120;--warn:#e2a84f;--warn-soft:#3a3120;--red:#e79199;--red-soft:#38262c;--danger:#e79199;--danger-soft:#38262c;--green:#74bca0;--green-soft:#1c2c2a;--good:#74bca0;--good-soft:#1c2c2a;--line:#2c343f;--navy:#212a34;--r-background-color:#12161b;--r-main-color:#eef1f5;--r-link-color:#4fb3a9;--r-selection-background-color:#3a3120}
html{font-size:24px}*{box-sizing:border-box}body{margin:0;background:var(--bg)}
.reveal{font:24px/1.5 "PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text)}
.reveal .slides{text-align:left}.reveal .slides>section{width:1280px;height:720px;padding:0}
.lesson-content{width:1280px;min-height:720px;padding:34px 42px!important;background:var(--bg)!important;position:relative}
h1,h2,h3,p,figure,pre,ul,ol{margin:0}ul,ol{padding-left:1.2em}p,li{line-height:1.5}a{color:var(--teal);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%}table{border-collapse:collapse}pre{white-space:pre-wrap;overflow-wrap:anywhere;tab-size:4}code{font-family:"SF Mono",ui-monospace,monospace}button{font:inherit}


.lesson-content {
  color: var(--ink);
  background: radial-gradient(circle at 92% 8%, rgba(47,111,120,.06), transparent 24%), var(--bg);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  letter-spacing: .01em;
  padding: 2rem 2.55rem 1.65rem;
}

.slidev-icon-btn[title="Show slide overview"],
.slidev-icon-btn[title="Slides Overview"],
.slidev-toc, .slidev-toc-list, #slidev-goto-dialog { display: none !important; }

h1, h2, h3 { color: var(--ink); font-weight: 650; letter-spacing: -.025em; }
h2 { font-size:50.56px; line-height: 1.2; margin: 0 0 .7rem; }
p, li { color: var(--ink-soft); line-height: 1.48; }
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}
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.warning { color: var(--warn); background: var(--warn-soft); border-left: 3px solid #cca86f; }
.danger-note { color: var(--danger); background: var(--danger-soft); border-left: 3px solid #c18489; }

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.cover h1 { margin: .32rem 0 .36rem; font-size:58px; line-height: 1.05; }
.cover-copy > p { max-width: 19rem; color: var(--ink-soft); font-size:29.76px; line-height: 1.55; }
.cover-meta { margin-top: 1.25rem; color: var(--muted); font-size:17.92px; }
.engine-orbit { position: relative; height: 17rem; }
.engine-orbit .core { position:absolute; inset:4.9rem 7.2rem; display:grid; place-items:center; border-radius:50%; background:var(--navy); color:white; text-align:center; font-size:33.6px; font-weight:700; box-shadow:0 10px 28px rgba(23,36,61,.18); }
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.contract-layout { display:grid; grid-template-columns:1.1fr .95fr; gap:.72rem; margin-top:.5rem; }.contract-panel { border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:.6rem }.contract-panel h3{font-size:23.04px;margin:0 0 .38rem}.weight-table{width:100%;border-collapse:collapse;font-size:17px}.weight-table th,.weight-table td{padding:.28rem .32rem;border-bottom:1px solid var(--line);text-align:right;color:var(--ink-soft)}.weight-table th:first-child,.weight-table td:first-child{text-align:left}.weight-table th{font-size:17px;color:var(--muted)}.weight-table tr.accent td{background:var(--accent-soft);color:var(--ink)}.result-stack{display:grid;gap:.34rem}.result-stack div{padding:.42rem .48rem;border-radius:7px;background:var(--surface)}.result-stack b,.result-stack span{display:block}.result-stack b{font-size:19.2px;color:var(--ink)}.result-stack span{font-size:17px;color:var(--ink-soft);margin-top:.08rem}

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.pca-visual{display:grid;grid-template-columns:1.35fr auto .85fr;gap:.55rem;align-items:center;margin-top:.55rem}
.pca-visual > b{display:grid;place-items:center;color:var(--muted);font-size:35.2px;font-weight:400}
.pca-fat,.pca-slim{padding:.55rem .6rem;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.pca-fat{background:var(--surface)}
.pca-slim{background:var(--accent-soft);border-color:var(--line)}
.pca-fat small,.pca-slim small,.pca-fat strong,.pca-slim strong,.pca-fat span,.pca-slim span{display:block}
.pca-fat small,.pca-slim small{font-size:17px;color:var(--muted)}
.pca-fat strong,.pca-slim strong{font-size:21.76px;color:var(--ink);margin:.1rem 0 .28rem}
.pca-fat span,.pca-slim span{font-size:17px;color:var(--ink-soft)}
.pca-fat .bars,.pca-slim .bars{height:2.4rem;margin:.2rem 0 .28rem;border-radius:6px;background:repeating-linear-gradient(90deg,var(--accent-2) 0,var(--accent-2) 10%,transparent 10%,transparent 14%)}
.pca-slim .bars{height:2.4rem;background:repeating-linear-gradient(90deg,var(--accent) 0,var(--accent) 28%,transparent 28%,transparent 36%)}

.knowledge-map.four{grid-template-columns:1fr auto 1fr auto 1fr auto 1fr}
.metric-row.three{grid-template-columns:repeat(3,1fr)}

.chart-frame.placeholder-chart{min-height:8.6rem;display:grid;place-items:center;text-align:center;border-style:dashed;background:var(--surface)}
.chart-frame.placeholder-chart .placeholder-copy{max-width:26rem;padding:0 .6rem;font-size:17px;line-height:1.55;color:var(--muted)}
.chart-frame.compact{padding:.28rem}
.chart-frame.compact img{height:9.4rem}
/* 单张横幅图：下方还要放要点或表格时用 */
.chart-frame.banner img{height:10.6rem}

/* 第 8 课的独立互动讲解页 */
.lesson-animation{margin-top:.35rem}
.lesson-animation iframe{display:block;width:100%;height:33rem;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.lesson-animation .animation-note{margin:.3rem 0 0;font-size:17px;line-height:1.35;color:var(--ink-soft)}
.lesson-animation .animation-note a{color:var(--accent)}
.mechanism-flow{display:grid;gap:.44rem;margin-top:.38rem}
.mechanism-flow .source-strip,.mechanism-flow .result-strip{padding:.48rem .62rem;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--ink)}
.mechanism-flow .source-strip strong,.mechanism-flow .result-strip strong{color:var(--accent);margin-right:.4rem}
.mechanism-flow .source-strip small,.mechanism-flow .result-strip small{color:var(--ink-soft);font-size:16px}
.mechanism-flow .tree-lanes{display:grid;grid-template-columns:repeat(3,1fr);gap:.42rem}
.mechanism-flow .tree-lanes>div{padding:.52rem;border:1px solid var(--line);border-radius:9px;background:var(--surface);min-width:0}
.mechanism-flow .tree-lanes b,.mechanism-flow .tree-lanes span,.mechanism-flow .tree-lanes strong{display:block}
.mechanism-flow .tree-lanes b{color:var(--accent);font-size:19px}
.mechanism-flow .tree-lanes span{color:var(--ink-soft);font-size:16px;line-height:1.35;margin-top:.14rem}
.mechanism-flow .tree-lanes strong{color:var(--ink);font-size:24px;margin-top:.25rem}
.mechanism-flow .parameter-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:.42rem}
.mechanism-flow .parameter-strip>div{padding:.42rem .5rem;border-radius:8px;background:var(--surface);color:var(--ink-soft);font-size:16px;line-height:1.3}
.mechanism-flow .parameter-strip b{display:block;color:var(--ink);font-size:17px}
.boost-sum{display:grid;grid-template-columns:repeat(4,1fr);gap:.4rem;margin-top:.5rem}
.boost-sum>div{padding:.58rem .48rem;border:1px solid var(--line);border-radius:9px;background:var(--surface);text-align:center}
.boost-sum>div:last-child{background:var(--accent-soft)}
.boost-sum small,.boost-sum strong,.boost-sum span{display:block}
.boost-sum small{font-size:16px;color:var(--muted)}
.boost-sum strong{font-size:23px;color:var(--ink);margin:.18rem 0}
.boost-sum span{font-size:16px;color:var(--ink-soft)}
.formula-explain{margin-top:.48rem;padding:.55rem .65rem;border-radius:9px;background:var(--surface);color:var(--ink-soft);font-size:17px;line-height:1.4}
.formula-explain strong{color:var(--ink)}
.score-example{width:100%;border-collapse:collapse;margin-top:.55rem;font-size:19px}
.score-example th,.score-example td{padding:.36rem .5rem;text-align:center;border-bottom:1px solid var(--line);color:var(--ink)}
.score-example th:first-child,.score-example td:first-child{text-align:left;color:var(--muted)}
.score-example .selected{background:var(--accent-soft);font-weight:700}
.exit-grid.single strong{font-size:28px}
.exit-grid.single .practice p{font-size:24px;line-height:1.5;margin:.65rem 0;color:var(--ink-soft)}
.exit-grid.single .practice p b{color:var(--accent)}
/* 超宽横图：铺满整幅宽度 */
.chart-frame.hero{margin-top:.35rem;padding:.3rem}
.chart-frame.hero img{width:100%;height:auto;max-height:15.2rem;object-fit:contain}
/* 折内指标表：等宽数字，列宽均分 */
.comparison.fold-table{table-layout:fixed}
.comparison.fold-table td:not(:first-child){font-family:"SF Mono",monospace;font-size:17px}

.chart-layout .chart-frame img{height:14.8rem;object-fit:contain}
.chart-layout .definition-stack{align-content:start}
.chart-layout .checklist{display:grid;align-content:start;gap:.28rem;padding:.48rem;height:100%;box-sizing:border-box}
.chart-layout .checklist > div{display:flex;align-items:baseline;flex-wrap:wrap;gap:.18rem .28rem;padding:.36rem .1rem;border-bottom:1px solid var(--line);grid-template-columns:unset}
.chart-layout .checklist > div:last-child{border-bottom:0}
.chart-layout .checklist i{flex:none}
.chart-layout .checklist b,.chart-layout .checklist span{display:inline;margin:0;line-height:1.4}
.chart-layout .checklist span{color:var(--ink-soft)}


.question-grid.three-col{grid-template-columns:repeat(3,1fr)}

/* 结构图 + 侧栏说明：上下两张参考图配一列要点 */
.dual-chart-layout{display:grid;grid-template-columns:1.42fr .78fr;gap:.55rem;align-items:stretch;margin-top:.3rem}
.chart-stack{display:grid;grid-template-rows:1fr 1fr;gap:.32rem}
.chart-stack .chart-frame{margin:0;padding:.24rem;border:1px solid var(--line);border-radius:10px;background:var(--surface);display:grid;place-items:center}
.chart-stack .chart-frame img{display:block;width:100%;height:8.4rem;object-fit:contain}
.dual-chart-layout + .meaning-grid{margin-top:.42rem}

/* 横版多子图：占满整幅宽度，下方只留两排要点 */
.chart-frame.panorama{margin-top:.3rem}
.chart-frame.panorama img{height:17.4rem}

.arch-flow.five{grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr}

.source-table{width:100%;border-collapse:collapse;margin-top:.5rem;font-size:17px}
.source-table th,.source-table td{padding:.34rem .42rem;border-bottom:1px solid var(--line);text-align:left;color:var(--ink-soft);line-height:1.42}
.source-table th{color:var(--muted);font-size:17px;text-transform:uppercase;letter-spacing:.04em}
.source-table td:first-child{color:var(--ink);font-weight:600;white-space:nowrap;font-family:"SF Mono",monospace;font-size:17px}
.source-table a{color:var(--accent)}

/* Typography, cover, cards, and navigation match the new course series. */
.lesson-content h2{font-size:40px;line-height:1.25;margin:8px 0 20px;color:var(--text)}
.lesson-content .eyebrow,.lesson-content .cover-tag{color:var(--accent);font-size:17px;letter-spacing:2px}
.lesson-content .lead{font-size:23px;line-height:1.45;margin:0 0 18px}
.lesson-content .cover{min-height:630px;gap:36px}.lesson-content .cover-copy{min-height:0;padding:10px 0}
.lesson-content .cover-copy h1{font-size:58px;line-height:1.22;letter-spacing:0;color:var(--text)}
.lesson-content .cover-copy p{font-size:26px;line-height:1.6;max-width:none}
.lesson-content .cover-meta{font-size:18px}.lesson-content .cover-refs span{font-size:15px}.lesson-content .cover-refs small{font-size:16px}
.lesson-content .cover-refs b{font-size:12px}.lesson-content .cover-refs a{grid-template-columns:26px 1fr}
.lesson-content .part-break-inner h1{font-size:58px;color:var(--accent)}
.lesson-content.part-break{display:flex;align-items:center;justify-content:center}
.lesson-content .slidev-code{font-size:21px!important;line-height:1.5!important;padding:18px 22px;background:var(--surface);color:var(--text);border:1px solid var(--line);border-radius:12px;margin:14px 0}
.lesson-content .slidev-code code{font-size:inherit;background:transparent;color:inherit;padding:0}
.lesson-content .mermaid{margin:12px auto;text-align:center;background:transparent}.lesson-content .mermaid svg{max-width:100%;max-height:440px}
.lesson-content .chart-frame{background:var(--surface);border-radius:12px}.lesson-content .chart-frame img{background:white;border-radius:6px}
.reveal .slide-number{font:17px "SF Mono",monospace;background:var(--surface);color:var(--muted);padding:10px 14px;right:22px;bottom:18px}
.reveal .controls{color:var(--accent)}.reveal .progress{color:var(--accent)}
@media print{.lesson-content{transform:none!important}}

body.reveal-viewport,.reveal,.reveal .slides{background:#12161b!important}

.lesson-content h2.long-title{font-size:33px;line-height:1.3}

/* Footer navigation matches lesson 04. */
.reveal .slide-number{font:15px "SF Mono",monospace;background:#1a2028;color:#a7b0bd;padding:6px 10px;right:auto;left:22px;bottom:12px;pointer-events:none}
.reveal .controls{color:#e2a84f;bottom:14px;right:12px}

/* 每个教学小节后的理解检查：先独立回答，再展开答案。 */
.lesson-content.check{height:720px;min-height:720px;overflow:hidden}
.check h2{font-size:38px;line-height:1.3;margin:8px 0 20px}
.check .case{font-size:26px;line-height:1.5;padding:20px 24px;background:var(--surface);border:1px solid var(--line);border-radius:14px;margin:18px 0;color:var(--text)}
.check .task{font-size:24px;line-height:1.5;border-left:4px solid var(--teal);padding:12px 20px;color:var(--text)}
.check .response{font-size:18px;color:var(--muted);margin-top:16px}
.check .answer{width:100%;margin-top:18px;border:1px solid var(--line);border-radius:10px;background:var(--surface);font-size:20px;line-height:1.5}
.check .answer summary{cursor:pointer;padding:12px 18px;color:var(--teal);font-weight:600;list-style:none}
.check .answer summary::-webkit-details-marker{display:none}
.check .answer summary::marker{content:""}
.check .answer summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}
.check .answer .answer-hide{display:none}
.check .answer[open] .answer-show{display:none}
.check .answer[open] .answer-hide{display:inline}
.check .answer-body{padding:0 20px 16px;color:var(--muted)}
.check .answer-body strong{color:var(--text)}

/* 第 6 页：用具体样本展示深树记住噪声的过程。 */
.chart-frame.overfit-story{width:100%;margin-top:.3rem;padding:.3rem}
.chart-frame.overfit-story img{display:block;width:100%;height:auto;max-height:17.2rem;object-fit:contain}
.overfit-takeaways{display:grid;grid-template-columns:repeat(3,1fr);gap:.42rem;margin-top:.46rem}
.overfit-takeaways>div{min-width:0;padding:.48rem .55rem;border:1px solid var(--line);border-radius:8px;background:var(--surface)}
.overfit-takeaways b,.overfit-takeaways span{display:block}
.overfit-takeaways b{font-size:18px;color:var(--ink)}
.overfit-takeaways span{margin-top:.12rem;font-size:17px;line-height:1.35;color:var(--ink-soft);overflow-wrap:anywhere}