:root{color-scheme:light;--ink:#183b32;--muted:#61716a;--gold:#a78546;--paper:#f7f6ef;--line:#d9e0d7}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8}a{color:inherit}img{max-width:100%;height:auto}button,a{touch-action:manipulation}.top{height:72px;padding:0 max(4vw,24px);display:flex;align-items:center;justify-content:space-between;background:#fcfcf8;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.brand{text-decoration:none;display:flex;align-items:center;gap:9px}.brand span{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--ink);color:#fff;font-family:serif}.brand strong{font-size:19px}.brand small{font-size:10px;letter-spacing:.1em;color:var(--muted)}.top nav{display:flex;gap:24px;font-size:13px}.top nav a{text-decoration:none}.top nav a:hover,.toc a:hover{color:#a36c29}.hero{background:radial-gradient(circle at 77% 18%,#d6e3d3 0,transparent 36%),linear-gradient(135deg,#e9eee7,#faf7eb);padding:76px max(5vw,24px) 60px}.hero>*{max-width:1060px;margin-left:auto;margin-right:auto}.eyebrow,.kicker{color:#94743a;font-size:12px;letter-spacing:.16em;font-weight:700}.hero h1{font-family:"Songti SC","STSong",serif;line-height:1.18;font-size:clamp(42px,5.7vw,78px);letter-spacing:.02em;margin-top:22px;margin-bottom:25px}.hero h1 em{font-style:normal;color:#537565}.hero p{font-size:18px;color:#3c5549;max-width:730px}.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:24px;margin-top:32px}.hero-actions a{text-decoration:none;font-weight:650;font-size:14px}.primary{display:inline-flex;align-items:center;justify-content:center;padding:12px 22px;background:#194d3a;color:#fff!important;border-radius:8px;text-decoration:none}.hero-note{border-top:1px solid #c8d5c8;padding-top:22px;margin-top:55px;color:#597164;font-size:13px}.layout{max-width:1220px;margin:0 auto;display:grid;grid-template-columns:216px minmax(0,1fr);gap:58px;padding:58px 24px 95px}.toc{position:sticky;align-self:start;top:104px;display:flex;flex-direction:column;gap:4px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:14px;max-height:calc(100vh - 125px);overflow:auto}.toc strong{font-size:13px;padding:4px 8px 11px}.toc a{padding:5px 8px;border-radius:6px;text-decoration:none;color:#4d6759;font-size:12px}.toc a:hover{background:#eff3ec}.chapters{min-width:0}.chapter{scroll-margin-top:100px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:clamp(24px,4vw,45px);margin-bottom:24px;box-shadow:0 12px 35px #173b3006}.chapter h2{font-family:"Songti SC","STSong",serif;font-size:clamp(27px,3vw,40px);line-height:1.28;margin:7px 0 22px}.chapter p,.chapter li{font-size:15px;color:#415449}.chapter ul,.chapter ol{padding-left:1.35em}.chapter li{padding:5px 0}.chapter strong{color:#183b32}.chapter a{text-underline-offset:3px}.chapter figure{margin:24px auto;background:#f5f7f2;border-radius:12px;padding:16px;max-width:600px;text-align:center}.chapter figure.wide{max-width:100%}.chapter figure img{border-radius:8px;display:block;margin:auto;max-height:580px;box-shadow:0 12px 30px #163c3018}.chapter figure.wide img{max-height:none;width:100%;object-fit:contain}.chapter figcaption{font-size:12px;color:#657b6c;margin-top:12px}.steps{counter-reset:item;list-style:none;padding:0!important}.steps li{padding:11px 0 11px 44px;position:relative;border-bottom:1px solid #edf0ea}.steps li:before{counter-increment:item;content:counter(item,decimal-leading-zero);position:absolute;left:0;top:10px;font-size:12px;font-weight:700;color:#9d7e45}.tip{border-left:3px solid #bb9b62;background:#f8f4e9;border-radius:0 9px 9px 0;padding:17px 19px;margin:24px 0;color:#425247;font-size:14px}.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.plans article{border:1px solid #dbe4da;border-radius:12px;padding:16px;background:#f9fbf8}.plans span{font-size:13px;color:#5f7567}.plans h3{font-size:27px;line-height:1.2;margin:5px 0}.plans p{font-size:13px;margin:0}.chapter details{border-bottom:1px solid #e8eee5;padding:13px 0}.chapter summary{cursor:pointer;font-weight:700}.chapter details p{margin-bottom:3px}.help-line{background:#f1f5ee;padding:14px 16px;border-radius:8px}.video video{display:block;width:min(100%,390px);aspect-ratio:9/16;max-height:none;object-fit:cover;background:#16382e;border-radius:12px;margin:12px 0 25px}.video>.primary{margin-top:6px}footer{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:28px max(5vw,24px);background:#173a2e;color:#f1f4ed;font-size:12px}footer span{color:#c4d4c8}@media(max-width:830px){.layout{display:block;padding:26px 14px 70px}.toc{position:static;max-height:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:18px}.toc strong{grid-column:1/-1}.chapter{margin-bottom:14px}.plans{grid-template-columns:1fr}.top nav a:first-child{display:none}}@media(max-width:520px){.top{height:60px;padding:0 14px}.brand small{display:none}.top nav{gap:10px;font-size:11px}.hero{padding:45px 21px 30px}.hero p{font-size:15px}.hero-actions{gap:16px}.hero-note{margin-top:37px}.toc{display:none}.chapter{padding:23px 17px}.chapter figure{padding:8px}.chapter figure img{max-height:470px}footer{display:block}footer>*{display:block;margin:7px 0}}

.guide-actions{display:flex;gap:18px;flex-wrap:wrap;align-items:center;margin:22px 0}.table-scroll{overflow-x:auto;margin:24px 0}.table-scroll table{border-collapse:collapse;width:100%;min-width:430px;font-size:14px;line-height:1.7}.table-scroll th,.table-scroll td{text-align:left;vertical-align:top;border:1px solid var(--line);padding:12px}.table-scroll th{background:#edf3e9}.plans{grid-template-columns:repeat(3,minmax(0,1fr))}.plans article{min-width:0}@media(max-width:830px){.plans{grid-template-columns:repeat(2,minmax(0,1fr))}}

.video video{width:100%;aspect-ratio:16/9;object-fit:contain;height:auto}.hero+.section{max-width:1172px;margin:35px auto 0;padding:0 24px}.hero+.section p{font-size:14px;color:var(--muted)}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{
 @page{size:A4;margin:17mm 16mm 18mm}
 html{scroll-behavior:auto}body{background:#fff;font-size:10pt;line-height:1.6;-webkit-print-color-adjust:exact;print-color-adjust:exact}
 .top,.toc,.hero-actions,.guide-actions,footer,video{display:none!important}
 .hero{background:#edf2e8;padding:22mm 8mm 14mm;break-after:page}.hero h1{font-size:36pt}.hero p{font-size:13pt}.hero-note{margin-top:15mm;font-size:10pt}
 .hero+.section{margin:0;padding:0 0 6mm}.layout{display:block;max-width:none;padding:0}.chapter{border:0;border-radius:0;box-shadow:none;padding:0;margin:0;break-before:page}
 .chapter h2{font-size:23pt;line-height:1.4;margin:2mm 0 6mm}.chapter h3{font-size:14pt;break-after:avoid}.kicker{font-size:9pt}.chapter p,.chapter li{font-size:10pt;line-height:1.7}
 .chapter figure,.chapter figure.wide{break-inside:avoid;max-width:100%;margin:5mm 0;padding:3mm}.chapter figure img,.chapter figure.wide img{width:auto;max-width:100%;max-height:88mm;box-shadow:none}.chapter figcaption{font-size:8pt}
 .steps li{break-inside:avoid;padding:3mm 0 3mm 10mm}.steps li:before{top:3mm}.tip{break-inside:avoid;font-size:9pt;padding:4mm;margin:5mm 0}.chapter details{break-inside:avoid;padding:3mm 0}.chapter summary{font-size:10pt}
 .table-scroll{overflow:visible;margin:5mm 0}.table-scroll table{min-width:0;font-size:9pt}.table-scroll th,.table-scroll td{padding:2.5mm}tr{break-inside:avoid}.plans{grid-template-columns:repeat(3,1fr)}.plans h3{font-size:20pt}.plans p{font-size:9pt}.plans article{padding:4mm}
 a{text-decoration:none}#video:after{content:'观看示例与试做：jiapu.men/demo?view=tree';display:block;margin:8mm 0;color:#315e44;font-size:12pt}
}

@media print{.hero{break-after:auto}.hero+.section{padding:10mm 8mm 0;break-after:page}.print-film{display:block;width:100%;height:auto;margin:8mm 0}}

/* Four complete tutorials, loaded only when a visitor chooses to watch. */
.tutorial-videos .tutorial-watch-note{color:var(--muted);font-size:13px}.tutorial-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 22px;margin-top:27px}.tutorial-card{min-width:0;scroll-margin-top:100px}.tutorial-card-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;color:#8f7040;font-size:11px}.tutorial-card-heading a{color:#526c4b}.tutorial-card h3{font:600 21px/1.6 "Songti SC",serif;min-height:2.9em;margin:9px 0 14px}.tutorial-card video{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:contain;background:#123a2c;border:1px solid #d7dfd0;border-radius:9px}.tutorial-card>p{font-size:13px;line-height:1.9;margin:13px 0}.tutorial-card details{border-top:1px solid var(--line);padding:12px 0 0;margin:14px 0 0}.tutorial-card summary{cursor:pointer;font-size:13px;color:#365e47;line-height:1.8}.tutorial-chapters{list-style:none!important;margin:12px 0 0;padding:0!important}.tutorial-chapters li{padding:0}.tutorial-chapters button{display:flex;gap:12px;width:100%;text-align:left;padding:10px 3px;border:0;border-bottom:1px solid #edf0e8;background:transparent;color:#3e5747;font:12px/1.7 system-ui;cursor:pointer}.tutorial-chapters button span{color:#917844;font-variant-numeric:tabular-nums;flex:none}.tutorial-chapters button:hover{background:#edf3e8}.tutorial-card .tutorial-status{font-size:12px;color:var(--muted);margin:7px 0 0;line-height:1.7}.tutorial-status:empty{display:none}.tutorial-chapters button:focus-visible,.tutorial-card a:focus-visible,.tutorial-card video:focus-visible{outline:3px solid #b28a41;outline-offset:3px;border-radius:4px}
@media(max-width:1050px){.tutorial-grid{grid-template-columns:1fr;gap:32px}.tutorial-card h3{min-height:0;margin-bottom:15px}}
@media print{.tutorial-videos{display:none!important}}
