:root{
  --bg:#F6EDE4;
  --deep:#E8D8C8;
  --paper:#FFF8F2;
  --soft:#F0E4D6;
  --ink:#1A1612;
  --text:#2A241C;
  --muted:#5A5048;
  --light:#7A7068;
  --orange:#E07030;
  --copper:#B06030;
  --border:rgba(26,22,18,.12);
  --focus:rgba(224,112,48,.50);
  --shadow:0 12px 28px rgba(26,22,18,.10)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.72 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden;padding-top:120px}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{max-width:100%}
.top-edge{position:fixed;inset:0 0 auto 0;height:20px;background:var(--ink);color:var(--bg);z-index:110}
.top-edge-inner,.head-inner,.quick-nav-inner,.footer-inner{max-width:960px;margin:0 auto;padding-left:16px;padding-right:16px}
.top-edge-inner{height:20px;display:flex;align-items:center;justify-content:space-between;font-size:12px;letter-spacing:.02em}
.text-button{border:0;background:transparent;color:var(--bg);padding:0 4px;min-height:20px}
.site-head{position:fixed;top:20px;left:0;right:0;height:54px;background:var(--paper);border-bottom:1px solid var(--orange);z-index:109}
.head-inner{height:54px;display:flex;align-items:center;justify-content:space-between}
.brand-link{display:inline-flex;align-items:center;min-width:44px;min-height:44px}
.brand-logo{height:24px;width:auto;max-width:120px;object-fit:contain;object-position:left center}
.brand-fallback{font-size:16px;font-weight:900;color:var(--ink);letter-spacing:.08em}
.head-actions{display:flex;align-items:center;gap:8px}
.app-link,.menu-button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px;border-radius:3px;font-size:14px}
.app-link{background:linear-gradient(135deg,#1A1612 0%,#E07030 100%);color:var(--paper)}
.menu-button{border:1px solid var(--orange);background:var(--paper);color:var(--ink)}
.quick-nav{position:fixed;top:74px;left:0;right:0;height:46px;background:var(--paper);border-bottom:1px solid var(--border);z-index:108}
.quick-nav-inner{height:46px;display:flex;align-items:center;gap:28px}
.quick-item{display:inline-flex;align-items:center;gap:8px;min-height:44px;font-size:13px;color:var(--muted)}
.quick-square{width:18px;height:18px;border:1px solid var(--ink);border-radius:2px;background:transparent}
.quick-item.is-active{color:var(--ink);font-weight:700}
.quick-item.is-active .quick-square{background:var(--orange);border-color:var(--orange)}
.site-main{max-width:960px;margin:0 auto;padding:36px 16px 56px}
.hero-browser{display:grid;grid-template-columns:1fr 240px;gap:26px;align-items:end;padding:18px 0 28px;border-bottom:1px solid var(--border)}
.hero-browser .hero-side{background:var(--ink);color:var(--paper);padding:18px;border-left:6px solid var(--orange)}
.hero-browser .hero-side strong{display:block;font-size:13px;margin-bottom:7px;color:var(--paper)}
.hero-browser .hero-side p{margin:0;font-size:13px;color:var(--bg)}
.eyebrow-row{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:12px}
.eyebrow-chip{display:inline-flex;align-items:center;min-height:30px;padding:0 10px;background:var(--orange);color:var(--paper);font-size:13px;border-radius:2px}
h1{font-size:24px;line-height:1.3;color:var(--ink);margin:0 0 10px}
h2{font-size:20px;line-height:1.35;color:var(--ink)}
h3{font-size:16px;line-height:1.42;color:var(--ink)}
.hero-line{font-size:17px;font-weight:750;color:var(--copper);margin:0 0 10px}
.lead{max-width:760px;margin:0;color:var(--muted)}
.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.btn-primary,.btn-secondary{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border-radius:3px;font-size:14px;font-weight:700}
.btn-primary{background:linear-gradient(135deg,#1A1612 0%,#E07030 100%);color:var(--paper)}
.btn-secondary{background:var(--paper);border:1px solid var(--orange);color:var(--ink)}
a:hover,.btn-primary:hover,.btn-secondary:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.section{margin:38px 0}
.section h2{margin:0 0 14px}
.section h3{margin:0 0 8px}
.section p{margin:0 0 12px}
.section-title-row{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:14px;border-bottom:1px solid var(--border);padding-bottom:10px}
.section-title-row p{margin:0;max-width:520px;color:var(--muted);font-size:13px;text-align:right}
.media-slot{background:var(--soft);border:1px solid var(--border);min-height:140px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.media-slot img{display:block;width:100%;height:100%;object-fit:contain;object-position:center}
.slot-short{height:176px}.slot-medium{height:220px}.slot-app{height:320px}.slot-banner{height:200px}.slot-icon{width:48px;height:48px;min-height:48px}
.index-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:24px 0 18px}
.index-strip a{background:var(--orange);color:var(--paper);padding:14px 15px;min-height:70px;border-radius:3px}
.index-strip strong{display:block;font-size:14px;margin-bottom:3px}
.index-strip span{font-size:12px;opacity:.92}
.diagonal-feature{display:grid;grid-template-columns:minmax(0,300px) 1fr;gap:22px;background:var(--paper);border:1px solid var(--border);box-shadow:var(--shadow);padding:16px;clip-path:polygon(0 0,100% 0,96% 100%,0 100%)}
.dual-cards{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.card{background:var(--paper);border:1px solid var(--border);border-radius:4px;padding:18px}
.card.dark{background:var(--ink);color:var(--paper)}
.card.dark h2,.card.dark h3{color:var(--paper)}
.card.orange{background:var(--orange);color:var(--paper);border-color:var(--orange)}
.card.orange h2,.card.orange h3{color:var(--paper)}
.page-spreads{display:grid;grid-template-columns:1.08fr .92fr;gap:14px}
.page-sheet{background:var(--paper);border:1px solid var(--border);padding:18px;position:relative}
.page-sheet:before{content:"";position:absolute;left:12px;right:12px;bottom:-5px;height:4px;background:var(--deep);border:1px solid var(--border);border-top:0}
.topic-map{display:grid;grid-template-columns:1.3fr .7fr;gap:14px}
.topic-map .map-note{background:var(--ink);color:var(--paper);padding:18px}
.topic-map .map-note h3{color:var(--paper)}
.period-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.period-item{background:var(--ink);color:var(--paper);padding:17px;border-radius:3px;border-top:4px solid var(--orange)}
.period-item h3{color:var(--paper)}
.status-list{display:grid;gap:10px}
.status-item{display:grid;grid-template-columns:140px 1fr;gap:14px;align-items:start;background:var(--paper);border-left:6px solid var(--orange);padding:15px 16px}
.app-split{display:grid;grid-template-columns:minmax(220px,300px) 1fr;gap:24px;align-items:center}
.app-copy{background:var(--paper);border:1px solid var(--border);padding:20px}
.app-icon-row{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.app-icon-row .media-slot{width:48px;height:48px;min-height:48px;flex:0 0 48px}
.guide-rail{display:grid;grid-template-columns:180px 1fr;gap:18px}
.guide-rail aside{background:var(--ink);color:var(--paper);padding:18px}
.guide-rail aside h3{color:var(--paper)}
.guide-rail .rail-body{display:grid;gap:10px}
.guide-rail .rail-body article{background:var(--paper);border:1px solid var(--border);padding:15px}
.note-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.note-grid article{background:var(--paper);border:1px solid var(--border);padding:16px}
.feature-list{display:grid;gap:12px}
.feature-row{display:grid;grid-template-columns:160px 1fr;gap:18px;padding:16px 0;border-bottom:1px solid var(--border)}
.feature-row strong{color:var(--ink)}
.page-head{margin-bottom:28px;padding:22px 0;border-bottom:1px solid var(--border)}
.page-head .page-kicker{font-size:13px;color:var(--copper);font-weight:800;margin-bottom:8px}
.page-head p{max-width:800px;margin:0;color:var(--muted)}
.page-intro-grid{display:grid;grid-template-columns:1fr 260px;gap:24px;align-items:start}
.page-intro-grid .intro-note{background:var(--orange);color:var(--paper);padding:18px}
.page-intro-grid .intro-note h2{color:var(--paper);font-size:16px}
.lens-list{display:grid;gap:12px}
.lens-row{display:grid;grid-template-columns:110px 1fr 120px;gap:16px;align-items:start;padding:15px;background:var(--paper);border:1px solid var(--border)}
.lens-row .tag{font-weight:800;color:var(--copper)}
.scene-column{display:grid;gap:16px}
.scene-block{background:var(--paper);border:1px solid var(--border);padding:18px}
.scene-block:nth-child(even){margin-left:8%;border-left:5px solid var(--orange)}
.production-flow{display:grid;gap:10px}
.production-step{display:grid;grid-template-columns:46px 150px 1fr;gap:14px;align-items:start;background:var(--paper);border:1px solid var(--border);padding:14px}
.production-step b{width:42px;height:42px;display:flex;align-items:center;justify-content:center;background:var(--orange);color:var(--paper);border-radius:2px}
.review-band{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.review-band article{padding:18px;background:var(--paper);border-top:6px solid var(--orange)}
.progress-stack{display:grid;gap:12px}
.progress-row{display:grid;grid-template-columns:160px 1fr;gap:15px;padding:16px;background:var(--paper);border:1px solid var(--border)}
.progress-row .state{font-weight:800;color:var(--copper)}
.memo-list{list-style:none;padding:0;margin:0;display:grid;gap:11px}
.memo-list li{background:var(--paper);border:1px solid var(--border);padding:15px 16px}
.method-steps{counter-reset:step;display:grid;gap:14px}
.method-step{counter-increment:step;display:grid;grid-template-columns:48px 1fr;gap:14px;align-items:start}
.method-step:before{content:counter(step);width:44px;height:44px;background:var(--orange);color:var(--paper);display:flex;align-items:center;justify-content:center;font-weight:900;border-radius:3px}
.theme-list{display:grid;gap:12px}
.theme-item{display:grid;grid-template-columns:190px 1fr;gap:18px;background:var(--paper);border:1px solid var(--border);padding:17px}
.index-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.index-card{background:var(--paper);border:1px solid var(--border);padding:18px}
.index-card h2{font-size:16px;margin-top:0}
.center-card{max-width:760px;margin:0 auto 18px;background:var(--paper);border:1px solid var(--border);padding:22px;text-align:center}
.terms{display:grid;gap:14px}
.terms section{background:var(--paper);border-top:4px solid var(--orange);padding:18px}
.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.help-grid article{background:var(--paper);border:1px solid var(--border);padding:17px}
.qa-list{display:grid;gap:12px}
.qa-item{background:var(--paper);border:1px solid var(--border);padding:18px}
.qa-item h2{font-size:16px;margin:0 0 8px}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.contact-grid article{background:var(--paper);border:1px solid var(--border);padding:18px}
.brand-manifesto{display:grid;grid-template-columns:1fr .78fr;gap:18px}
.brand-manifesto .brand-dark{background:var(--ink);color:var(--paper);padding:22px}
.brand-manifesto .brand-dark h2{color:var(--paper)}
.timeline-lite{display:grid;gap:10px}
.timeline-lite div{border-left:5px solid var(--orange);background:var(--paper);padding:14px 16px}
.callout{padding:17px 18px;background:var(--orange);color:var(--paper);border-radius:3px}
.callout strong{color:var(--paper)}
.inline-list{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 0}
.inline-list span{border:1px solid var(--orange);background:var(--paper);padding:6px 9px;border-radius:2px;font-size:13px}
.site-footer{background:var(--ink);color:var(--bg);border-top:1px solid var(--orange)}
.footer-inner{padding-top:28px;padding-bottom:74px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.footer-logo{height:24px;width:auto;object-fit:contain}.footer-logo-text{font-weight:900}
.footer-links{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.footer-links h2{font-size:13px;margin:0 0 8px;color:var(--paper)}
.footer-links a{display:block;font-size:13px;color:var(--bg);padding:4px 0}
.footer-note,.copyright{font-size:13px;color:#F6EDE4;margin:18px 0 0;max-width:820px}
.overlay{position:fixed;inset:0;background:rgba(26,22,18,.56);z-index:200;visibility:hidden;opacity:0;pointer-events:none;transition:.18s}
.overlay.is-open{visibility:visible;opacity:1;pointer-events:auto}
.menu-panel{position:fixed;top:28px;left:50%;transform:translate(-50%,-18px);width:320px;max-height:360px;overflow:auto;background:var(--paper);z-index:210;border:1px solid var(--orange);box-shadow:var(--shadow);visibility:hidden;opacity:0;pointer-events:none;transition:.18s}
.menu-panel.is-open{transform:translate(-50%,0);visibility:visible;opacity:1;pointer-events:auto}
.menu-head{position:sticky;top:0;background:var(--paper);display:flex;align-items:center;justify-content:space-between;padding:12px;border-bottom:1px solid var(--border);z-index:2}
.menu-brand{display:flex;align-items:center;gap:8px}.close-button{min-height:40px;padding:0 12px;border:1px solid var(--ink);background:var(--paper);color:var(--ink);border-radius:3px}
.menu-groups{padding:8px 12px 14px}.menu-groups h2{font-size:13px;color:var(--copper);margin:10px 0 4px}.menu-groups a{display:grid;grid-template-columns:84px 1fr;gap:8px;padding:8px 0;border-bottom:1px solid var(--border)}.menu-groups strong{font-size:14px}.menu-groups span{font-size:12px;color:var(--muted)}
.search-panel{position:fixed;left:0;right:0;top:74px;z-index:205;visibility:hidden;opacity:0;pointer-events:none}.search-panel.is-open{visibility:visible;opacity:1;pointer-events:auto}.search-card{max-width:720px;margin:0 auto;background:var(--paper);border:1px solid var(--orange);box-shadow:var(--shadow);padding:18px}.search-title-row{display:flex;align-items:center;justify-content:space-between}.search-title-row h2{font-size:20px;margin:0}.search-card label{display:block;font-size:13px;margin-top:12px}.search-card input{width:100%;height:44px;border:1px solid var(--border);background:var(--bg);padding:0 12px;color:var(--ink)}.search-results{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.search-results a{min-height:44px;display:flex;align-items:center;padding:0 12px;border:1px solid var(--border);background:var(--soft)}
.no-scroll{overflow:hidden}.mobile-bottom{display:none}.muted{color:var(--muted)}.small{font-size:13px}.hr{height:1px;background:var(--border);margin:22px 0}
@media(max-width:720px){
 body{padding-top:74px;padding-bottom:calc(48px + env(safe-area-inset-bottom))}.quick-nav{display:none}.site-main{padding-top:24px;padding-left:16px;padding-right:16px;padding-bottom:62px}
 .hero-browser,.dual-cards,.page-spreads,.topic-map,.period-grid,.app-split,.guide-rail,.note-grid,.page-intro-grid,.review-band,.index-cards,.help-grid,.contact-grid,.brand-manifesto{grid-template-columns:1fr}
 .diagonal-feature{grid-template-columns:1fr;clip-path:none}.diagonal-feature .media-slot{max-width:300px}
 .section-title-row{display:block}.section-title-row p{text-align:left;margin-top:4px}
 .feature-row,.lens-row,.production-step,.progress-row,.theme-item{grid-template-columns:1fr}
 .scene-block:nth-child(even){margin-left:0}.status-item{grid-template-columns:1fr;gap:5px}.app-split .media-slot{max-width:300px;margin:0 auto}
 .footer-links{grid-template-columns:1fr 1fr}.footer-inner{padding-left:16px;padding-right:16px;padding-bottom:82px}.menu-panel{width:88%;max-height:360px;top:24px}
 .search-panel{top:0;bottom:0;background:var(--ink);padding:18px 12px}.search-card{height:100%;overflow:auto;background:var(--ink);color:var(--paper);border-color:var(--orange)}.search-title-row h2,.search-card p,.search-card label{color:var(--paper)}.search-card .close-button{background:var(--paper);color:var(--ink)}.search-card input{background:#2A241C;color:var(--paper);border-color:rgba(255,255,255,.18)}.search-results{grid-template-columns:1fr}.search-results a{background:#2A241C;color:var(--paper);border-color:rgba(255,255,255,.16)}
 .mobile-bottom{position:fixed;display:grid;grid-template-columns:repeat(4,1fr);left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);z-index:120;background:var(--ink);border-top:1px solid var(--orange)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;color:var(--paper);font-size:13px}.mobile-bottom a.is-active{background:var(--orange);color:var(--ink);font-weight:800}
 .head-inner{padding:0 12px}.app-link,.menu-button{padding:0 10px}.index-strip{grid-template-columns:1fr}.hero-browser .hero-side{margin-top:8px}
}
@media(max-width:420px){.footer-links{grid-template-columns:1fr 1fr}.head-actions{gap:5px}.app-link,.menu-button{font-size:13px}.eyebrow-row{gap:6px}.search-card{padding:14px}}