:root {
    --bg:#F6EDE4; --bg-deep:#E8D8C8; --paper:#FFF8F2; --soft:#F0E4D6;
    --ink:#1A1612; --text:#2A241C; --muted:#5A5048; --quiet:#7A7068;
    --orange:#E07030; --copper:#B06030; --line:rgba(26,22,18,.12); --focus:rgba(224,112,48,.50);
    --shadow:0 12px 28px rgba(26,22,18,.10); --max:960px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans SC","Microsoft YaHei","PingFang SC",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden} a{color:inherit;text-decoration:none} button,input{font:inherit} button{cursor:pointer} img{max-width:100%;display:block} :focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.top-strip{position:fixed;z-index:1200;top:0;left:0;right:0;height:20px;padding:0 max(16px,calc((100vw - var(--max))/2));display:flex;align-items:center;justify-content:space-between;background:var(--ink);color:var(--bg);font-size:12px;line-height:20px}.top-strip a,.top-strip button{min-height:20px}.text-button{border:0;background:transparent;color:inherit;padding:0 2px}
.site-header{position:fixed;z-index:1190;top:20px;left:0;right:0;height:54px;background:var(--paper);border-bottom:1px solid var(--orange)}.header-inner{width:min(var(--max),calc(100% - 32px));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand-link{display:flex;align-items:center;min-width:44px;min-height:44px}.brand-logo{height:24px;width:auto;max-width:150px;object-fit:contain;object-position:center}.brand-fallback{font-weight:800;font-size:16px;color:var(--ink)}.header-actions{display:flex;align-items:center;gap:8px}.app-link,.menu-trigger{min-height:44px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;border-radius:4px;font-size:14px}.app-link{border:1px solid var(--orange);background:var(--paper);color:var(--ink)}.menu-trigger{border:1px solid var(--ink);background:var(--ink);color:var(--paper)}
.quick-index{position:fixed;z-index:1180;top:74px;left:0;right:0;height:46px;background:var(--paper);border-bottom:1px solid var(--line)}.quick-index-inner{width:min(var(--max),calc(100% - 32px));height:100%;margin:auto;display:flex;align-items:center;gap:26px}.quick-item{display:flex;align-items:center;gap:8px;min-height:44px;font-size:13px}.quick-square{width:18px;height:18px;border:1px solid var(--ink);border-radius:2px;background:var(--paper)}.quick-item.is-current .quick-square{background:var(--orange);border-color:var(--orange)}
.site-main{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding:148px 0 70px}.page-head{margin:0 0 30px}.eyebrow{font-size:13px;color:var(--copper);font-weight:700;letter-spacing:.04em}.page-head h1,.hero h1{font-size:24px;line-height:1.3;color:var(--ink);margin:8px 0 12px}.page-head p,.hero p{margin:0;max-width:760px}.lead{font-size:16px;color:var(--muted)} h2{font-size:20px;line-height:1.4;color:var(--ink);margin:0 0 12px} h3{font-size:16px;line-height:1.45;color:var(--ink);margin:0 0 8px} p{margin:0 0 12px}.section{margin:36px 0}.section:last-child{margin-bottom:0}.section-title{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:16px}.section-title p{margin:0;color:var(--muted);font-size:13px}.card{background:var(--paper);border:1px solid var(--line);border-radius:4px;box-shadow:var(--shadow);padding:22px}.card-flat{background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:20px}.soft{background:var(--soft)}.dark{background:var(--ink);color:var(--paper)}.dark h2,.dark h3{color:var(--paper)}.orange{background:var(--orange);color:var(--paper)}.orange h2,.orange h3{color:var(--paper)}.muted{color:var(--muted)}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn-primary,.btn-secondary{height:42px;min-width:120px;padding:0 16px;border-radius:4px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;white-space:nowrap}.btn-primary{background:linear-gradient(135deg,#1A1612 0%,#E07030 100%);color:#FFF8F2}.btn-secondary{background:var(--paper);border:1px solid var(--orange);color:var(--ink)}.btn-primary:hover,.btn-secondary:hover,.app-link:hover{transform:translateY(-1px);box-shadow:0 7px 16px rgba(26,22,18,.12)}
.media-slot{background:var(--paper);border:1px solid var(--line);border-radius:4px;min-height:150px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.media-short{height:176px}.media-app{height:320px}.media-banner{height:200px}.media-square{aspect-ratio:1/1;max-height:250px}
.hero-indexes{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}.hero-indexes a{min-height:44px;padding:10px 14px;background:var(--orange);color:var(--paper);border-radius:4px;display:inline-flex;align-items:center;font-size:13px}.hero{padding:18px 0 8px}.hero .tagline{font-size:20px;color:var(--ink);font-weight:800;margin:2px 0 10px}.hero .intro{max-width:760px}
.diagonal-record{display:grid;grid-template-columns:minmax(0,300px) 1fr;gap:0;align-items:stretch;background:var(--paper);border:1px solid var(--line);border-radius:4px;overflow:hidden;box-shadow:var(--shadow)}.diagonal-record .media-wrap{padding:18px;background:var(--soft);clip-path:polygon(0 0,100% 0,88% 100%,0 100%)}.diagonal-record .copy{padding:24px 24px 24px 12px}.diagonal-record ul{margin:10px 0 0;padding-left:18px}.diagonal-record li{margin:4px 0}
.twin-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}.twin-cards .card{box-shadow:none}.twin-cards .with-media{display:grid;grid-template-columns:140px 1fr;gap:16px}.twin-cards .with-media .media-slot{min-height:150px}
.page-roll{display:grid;grid-template-columns:1fr 1fr;gap:18px}.roll-sheet{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:24px 24px 24px 32px;box-shadow:0 10px 20px rgba(26,22,18,.06)}.roll-sheet:before{content:"";position:absolute;left:10px;top:18px;bottom:18px;width:4px;border-radius:2px;background:var(--orange)}.roll-sheet .media-slot{margin-bottom:16px}
.rack-intro{display:grid;grid-template-columns:220px 1fr;gap:18px;align-items:stretch}.rack-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}.rack-cards article{background:var(--paper);border-top:4px solid var(--orange);padding:20px;border-radius:4px}
.thirds{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.thirds article{background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:20px}.thirds .media-slot{margin-bottom:14px}.status-list{display:grid;gap:10px}.status-row{display:grid;grid-template-columns:120px 1fr auto;gap:16px;align-items:center;background:var(--paper);border:1px solid var(--line);padding:14px 16px;border-radius:4px}.status-chip{font-size:13px;font-weight:700;color:var(--copper)}
.app-split{display:grid;grid-template-columns:minmax(220px,320px) 1fr;gap:24px;align-items:center}.app-visual{position:relative}.app-icon{position:absolute;right:14px;bottom:14px;width:64px;height:64px;padding:8px;background:var(--paper);border:1px solid var(--line);border-radius:4px;box-shadow:var(--shadow)}.app-icon img{width:48px;height:48px;object-fit:contain}
.faq-mini{display:grid;grid-template-columns:1fr 1fr;gap:12px}.faq-mini article{background:var(--paper);border:1px solid var(--line);padding:18px;border-radius:4px}.brand-note{background:var(--ink);color:var(--paper);padding:26px;border-left:6px solid var(--orange);border-radius:4px}.brand-note h2{color:var(--paper)}
/* inner layouts */
.inner-twin{display:grid;grid-template-columns:1fr 1fr;gap:18px}.inner-twin article{background:var(--paper);border:1px solid var(--line);padding:22px;border-radius:4px}.inner-twin .media-slot{margin-bottom:16px}.feature-diagonal{display:grid;grid-template-columns:minmax(240px,34%) 1fr;background:var(--paper);border:1px solid var(--line);overflow:hidden;border-radius:4px}.feature-diagonal .media-side{padding:18px;background:var(--soft);clip-path:polygon(0 0,100% 0,84% 100%,0 100%)}.feature-diagonal .text-side{padding:26px 26px 26px 10px}.feature-diagonal .text-side article+article{border-top:1px solid var(--line);padding-top:16px;margin-top:16px}.article-rolls{display:grid;grid-template-columns:1fr 1fr;gap:16px}.article-roll{background:var(--paper);border:1px solid var(--line);padding:24px 24px 24px 32px;position:relative;border-radius:4px}.article-roll:after{content:"";position:absolute;left:14px;top:22px;bottom:22px;width:3px;background:var(--orange)}.single-notes{max-width:780px;margin:auto;display:grid;gap:14px}.single-notes article{background:var(--paper);border:1px solid var(--line);padding:22px;border-radius:4px}.single-notes .media-slot{margin-bottom:16px}.timeline-thirds{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.timeline-thirds article{background:var(--paper);border-top:4px solid var(--orange);padding:22px;border-radius:4px}.timeline-thirds .media-slot{margin-bottom:14px}.state-board{display:grid;gap:12px}.state-item{display:grid;grid-template-columns:130px 1fr;gap:18px;background:var(--paper);border:1px solid var(--line);padding:20px;border-radius:4px}.state-item strong{color:var(--copper)}.checklist{display:grid;grid-template-columns:1fr 1fr;gap:16px}.checklist article{background:var(--paper);border:1px solid var(--line);padding:22px;border-radius:4px}.checklist ul{margin:8px 0 0;padding-left:20px}.checklist li{margin:7px 0}.method-list{display:grid;gap:16px}.method-list article{display:grid;grid-template-columns:150px 1fr;gap:20px;background:var(--paper);border:1px solid var(--line);padding:20px;border-radius:4px}.method-step{font-weight:800;color:var(--orange);font-size:18px}.topic-list{display:grid;gap:12px}.topic-item{display:grid;grid-template-columns:180px 1fr;gap:20px;background:var(--paper);border-left:5px solid var(--orange);padding:20px;border-radius:4px}.center-cards{display:grid;grid-template-columns:repeat(2,minmax(0,340px));justify-content:center;gap:18px}.center-cards article{background:var(--paper);border:1px solid var(--line);text-align:center;padding:24px;border-radius:4px}.legal-sections{display:grid;gap:14px}.legal-sections section{background:var(--paper);border:1px solid var(--line);padding:22px;border-radius:4px}.rights-stack{display:grid;gap:14px}.rights-stack section{background:var(--paper);border:1px solid var(--line);border-left:6px solid var(--orange);padding:22px 24px;border-radius:4px}.rights-stack section:nth-child(even){margin-left:42px;background:var(--soft)}
.grade-flow{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grade-flow section{background:var(--paper);border:1px solid var(--line);padding:22px;border-radius:4px}.grade-flow section:nth-child(3n){grid-column:1/-1;border-top:4px solid var(--orange)}
.privacy-ledger{counter-reset:privacy;display:grid;gap:14px}.privacy-ledger section{counter-increment:privacy;display:grid;grid-template-columns:72px 1fr;gap:18px;background:var(--paper);border:1px solid var(--line);padding:20px;border-radius:4px}.privacy-ledger section:before{content:"0" counter(privacy);font-size:24px;font-weight:800;color:var(--orange);align-self:start;border-right:1px solid var(--line)}.privacy-ledger section h2,.privacy-ledger section p{grid-column:2}
.install-steps{counter-reset:install;display:grid;gap:16px}.install-steps section{counter-increment:install;position:relative;background:var(--paper);border:1px solid var(--line);padding:22px 22px 22px 72px;border-radius:4px}.install-steps section:before{content:counter(install);position:absolute;left:20px;top:20px;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--orange);color:var(--paper);font-weight:800}.help-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.help-grid article{background:var(--paper);border:1px solid var(--line);padding:20px;border-radius:4px}.faq-list{display:grid;gap:12px}.faq-list details{background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:16px 18px}.faq-list summary{font-weight:800;color:var(--ink);cursor:pointer;min-height:44px;display:flex;align-items:center}.contact-paths{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.contact-paths article{background:var(--paper);border-top:4px solid var(--orange);padding:22px;border-radius:4px}.about-banner{margin-bottom:22px}.about-stack{display:grid;gap:16px}.about-stack article{background:var(--paper);border:1px solid var(--line);padding:22px;border-radius:4px}.about-brand-visual{display:grid;grid-template-columns:220px 1fr;gap:20px;align-items:center}
.site-footer{background:var(--ink);color:var(--bg);border-top:2px solid var(--orange);padding:34px 0 76px;font-size:13px}.footer-inner{width:min(var(--max),calc(100% - 32px));margin:auto}.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:22px}.footer-logo-link{display:flex;align-items:center;min-height:44px}.footer-logo{height:24px;width:auto;object-fit:contain}.footer-logo-fallback{font-size:20px;font-weight:800}.footer-brand div{display:flex;flex-direction:column;line-height:1.2}.footer-brand span{font-size:11px;color:#cdbbaa}.footer-links{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:18px 0;border-top:1px solid rgba(246,237,228,.14);border-bottom:1px solid rgba(246,237,228,.14)}.footer-links h2{font-size:13px;color:var(--paper);margin-bottom:8px}.footer-links a{display:block;color:var(--bg);padding:4px 0}.footer-links a:hover{color:#fff}.footer-notice{margin:18px 0 8px;color:#dacabd;max-width:800px}.copyright{margin:0;color:#aa9d92}
.overlay{position:fixed;inset:0;z-index:1500;background:rgba(26,22,18,.48);opacity:0;pointer-events:none;transition:opacity .18s ease}.overlay.is-active{opacity:1;pointer-events:auto}.menu-panel{position:fixed;z-index:1600;top:82px;left:50%;transform:translate(-50%,-18px);width:320px;max-height:360px;overflow:auto;background:var(--paper);border:1px solid var(--orange);border-radius:6px;box-shadow:0 22px 60px rgba(0,0,0,.24);padding:16px;visibility:hidden;pointer-events:none;opacity:0;transition:.18s ease}.menu-panel.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:translate(-50%,0)}.menu-head,.search-head{display:flex;justify-content:space-between;gap:12px;align-items:center;padding-bottom:12px;border-bottom:1px solid var(--line)}.menu-brand{display:flex;align-items:center;gap:8px}.menu-brand img{height:24px;max-width:120px;object-fit:contain}.panel-close{min-height:44px;padding:0 12px;border:1px solid var(--ink);background:var(--paper);color:var(--ink);border-radius:4px}.menu-groups section{padding:12px 0;border-bottom:1px solid var(--line)}.menu-groups section:last-child{border-bottom:0}.menu-groups h2{font-size:13px;color:var(--copper);margin:0 0 6px}.menu-groups a{display:grid;grid-template-columns:74px 1fr;gap:8px;padding:7px 0}.menu-groups a strong{font-size:14px}.menu-groups a span{font-size:12px;color:var(--muted)}
.search-layer{position:fixed;z-index:1650;top:74px;left:0;right:0;visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-8px);transition:.18s ease}.search-layer.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:none}.search-card{width:min(var(--max),calc(100% - 32px));margin:auto;background:var(--paper);border:1px solid var(--orange);box-shadow:var(--shadow);padding:18px;border-radius:0 0 6px 6px}.search-head p{font-size:13px;color:var(--muted);margin:2px 0 0}.search-label{display:block;font-size:13px;color:var(--muted);margin:14px 0 6px}.search-card input{width:100%;height:44px;border:1px solid var(--line);background:#fff;padding:0 12px;border-radius:4px;color:var(--ink)}.search-results{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}.search-results a{background:var(--soft);border:1px solid var(--line);padding:12px;border-radius:4px;font-weight:700;min-height:64px}.search-results span{display:block;font-size:12px;color:var(--muted);font-weight:400}.search-empty{margin-top:14px;color:var(--muted)}.ui-locked{overflow:hidden}
.mobile-bottom{display:none}
@media (max-width:760px){
    body{font-size:15px}.quick-index{display:none}.site-main{padding-top:102px;padding-bottom:88px}.top-strip{padding:0 16px}.header-inner{width:calc(100% - 32px)}.app-link,.menu-trigger{padding:0 10px}.brand-logo{max-width:110px}.hero h1,.page-head h1{font-size:24px}
    .diagonal-record,.feature-diagonal,.rack-intro,.app-split,.about-brand-visual{grid-template-columns:1fr}.diagonal-record .media-wrap,.feature-diagonal .media-side{clip-path:none}.diagonal-record .copy,.feature-diagonal .text-side{padding:20px}.twin-cards,.page-roll,.inner-twin,.article-rolls,.checklist,.help-grid,.contact-paths,.faq-mini,.center-cards,.rack-cards{grid-template-columns:1fr}.twin-cards .with-media{grid-template-columns:1fr}.thirds,.timeline-thirds{grid-template-columns:1fr}.status-row{grid-template-columns:1fr;gap:4px}.state-item,.method-list article,.topic-item{grid-template-columns:1fr}.media-app{height:300px}.media-banner{height:200px}
    .rights-stack section:nth-child(even){margin-left:0}.grade-flow{grid-template-columns:1fr}.grade-flow section:nth-child(3n){grid-column:auto}.privacy-ledger section{grid-template-columns:52px 1fr;gap:12px}.footer-links{grid-template-columns:1fr 1fr}.site-footer{padding-bottom:98px}
    .menu-panel{top:68px;width:88%;max-height:360px}.search-layer{inset:0;top:0;background:var(--ink);padding:18px 16px;transform:none}.search-card{width:100%;height:100%;margin:0;background:var(--ink);color:var(--paper);border:0;box-shadow:none;padding:12px}.search-head{border-color:rgba(246,237,228,.16)}.search-head strong,.search-head p,.search-label{color:var(--paper)}.search-card .panel-close{background:transparent;color:var(--paper);border-color:var(--paper)}.search-card input{background:#2a241f;color:var(--paper);border-color:rgba(246,237,228,.18)}.search-results{grid-template-columns:1fr}.search-results a{background:#2a241f;color:var(--paper);border-color:rgba(246,237,228,.12)}.search-results span{color:#d2c2b4}.search-empty{color:#d2c2b4}
    .mobile-bottom{position:fixed;z-index:1300;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:var(--paper);border-top:1px solid var(--line)}.mobile-bottom a{height:48px;display:flex;align-items:center;justify-content:center;font-size:13px}.mobile-bottom a.is-current{background:var(--orange);color:var(--ink);font-weight:800}.overlay{z-index:1500}.menu-panel,.search-layer{z-index:1600}
}
@media (max-width:420px){.header-actions{gap:4px}.app-link,.menu-trigger{font-size:13px;padding:0 8px}.footer-links{grid-template-columns:1fr}.hero-indexes a{flex:1 1 30%;justify-content:center}.page-head{margin-bottom:22px}.card,.card-flat{padding:18px}}