:root{
  --paper:#F2E6C8;
  --deep:#E0D2AE;
  --card:#FBF4E2;
  --soft:#EBE0C4;
  --ink:#161208;
  --text:#2A2210;
  --muted:#5A4A28;
  --aux:#7A6840;
  --gold:#5C4814;
  --sea:#B8943A;
  --border:rgba(22,18,8,.12);
  --strong-border:rgba(92,72,20,.50);
  --shadow:0 12px 28px rgba(22,18,8,.10);
  --max:960px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;background:var(--paper);color:var(--text);font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}
body.is-locked{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{color:inherit}
img{display:block;max-width:100%;height:auto;object-fit:contain;object-position:center}
.skip-link{position:fixed;left:16px;top:-80px;z-index:120;background:var(--ink);color:var(--card);padding:10px 14px;border-radius:4px}
.skip-link:focus{top:8px}
.site-header{position:fixed;inset:0 0 auto 0;z-index:70;background:var(--card);box-shadow:0 1px 0 var(--border)}
.top-strip{height:20px;background:var(--ink);color:var(--sea);font-size:12px;line-height:20px}
.top-strip-inner,.brand-bar-inner,.wave-nav-inner,.footer-inner,.page-wrap{width:min(calc(100% - 32px),var(--max));margin:0 auto}
.top-strip-inner{height:20px;display:flex;align-items:center;justify-content:space-between}
.top-brand{letter-spacing:.08em;white-space:nowrap}
.top-search{position:relative;border:0;background:transparent;color:var(--sea);padding:0 2px;line-height:20px;cursor:pointer}
.top-search::before{content:"";position:absolute;inset:-12px -10px}
.top-search:hover,.top-search:focus-visible{color:var(--card);outline:none}
.brand-bar{height:54px;background:var(--card);border-bottom:1px solid var(--strong-border)}
.brand-bar-inner{height:54px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.brand-link{display:inline-flex;align-items:center;min-height:44px;min-width:80px;color:var(--ink);font-size:16px;font-weight:700;letter-spacing:.04em}
.brand-logo-slot{display:inline-flex;align-items:center;min-width:0}
.brand-logo{height:24px;width:auto;max-width:136px}
.brand-logo-slot:has(img)+.brand-fallback{display:none}
.brand-actions{display:flex;align-items:center;gap:8px;white-space:nowrap}
.app-link,.menu-toggle,.close-button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:4px;font-size:14px;cursor:pointer}
.app-link{padding:0 14px;border:1px solid var(--gold);background:var(--card);color:var(--ink)}
.menu-toggle,.close-button{padding:0 14px;border:1px solid var(--strong-border);background:var(--soft)}
.app-link:hover,.app-link:focus-visible,.menu-toggle:hover,.menu-toggle:focus-visible,.close-button:hover,.close-button:focus-visible{outline:2px solid var(--sea);outline-offset:2px}
.wave-nav{height:40px;background:var(--card)}
.wave-nav-inner{height:40px;display:flex;align-items:flex-end;justify-content:center;gap:26px;padding-bottom:5px}
.wave-nav a{position:relative;width:220px;max-width:28%;height:30px;display:flex;align-items:flex-start;justify-content:center;color:var(--muted);font-size:13px}
.wave-nav a i{position:absolute;left:0;right:0;bottom:0;height:6px;border:1px solid var(--gold);border-radius:50% 50% 45% 55%/50% 55% 45% 50%;transform:skewX(-14deg)}
.wave-nav a.is-current{color:var(--ink);font-weight:700}
.wave-nav a.is-current i{background:var(--sea);border-color:var(--sea)}
.wave-nav a:hover,.wave-nav a:focus-visible{color:var(--ink);outline:none}
.site-main{min-height:60vh;padding-top:114px;padding-bottom:56px}
.page-wrap{position:relative}
.page-head{padding:46px 0 24px}
.page-kicker{margin:0 0 8px;color:var(--gold);font-size:13px;font-weight:700;letter-spacing:.08em}
h1,h2,h3,p{overflow-wrap:anywhere}
h1{margin:0 0 14px;color:var(--ink);font-size:24px;line-height:1.3;letter-spacing:.01em}
h2{margin:0 0 12px;color:var(--ink);font-size:20px;line-height:1.4}
h3{margin:0 0 8px;color:var(--ink);font-size:16px;line-height:1.5}
p{margin:0 0 14px}
.lead{max-width:760px;color:var(--muted);font-size:15px}
.eyebrow{display:inline-block;margin-bottom:12px;color:var(--gold);font-size:12px;font-weight:700;letter-spacing:.08em}
.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.btn{min-height:44px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;border-radius:4px;font-size:14px;white-space:nowrap;border:1px solid transparent}
.btn-primary{background:linear-gradient(135deg,#161208 0%,#B8943A 100%);color:var(--card)}
.btn-secondary{background:var(--card);color:var(--ink);border-color:var(--gold)}
.btn:hover,.btn:focus-visible{transform:translateY(-1px);box-shadow:var(--shadow);outline:2px solid var(--sea);outline-offset:2px}
.section{margin:30px 0;padding:26px;background:var(--card);border:1px solid var(--border);border-radius:4px;box-shadow:var(--shadow)}
.section.flat{box-shadow:none}
.section.dark{background:var(--ink);color:var(--paper);border-color:rgba(184,148,58,.45)}
.section.dark h2,.section.dark h3{color:var(--card)}
.section.dark p{color:var(--paper)}
.section.gold{background:var(--gold);color:var(--card);border-color:var(--gold)}
.section.gold h2,.section.gold h3{color:var(--card)}
.text-link{color:var(--gold);font-weight:700;text-decoration:underline;text-underline-offset:4px}
.divider{height:1px;background:var(--border);margin:22px 0}
.image-slot{display:flex;align-items:center;justify-content:center;min-height:150px;background:var(--card);border:1px solid var(--border);border-radius:4px;overflow:hidden}
.image-slot img{max-width:100%;max-height:100%;margin:auto}
.image-slot.tall{height:320px}
.image-slot.medium{height:220px}
.image-slot.banner{height:200px}
.index-intro{padding:42px 0 12px}
.index-line{display:flex;align-items:center;gap:10px;margin-bottom:20px;color:var(--muted);font-size:13px}
.index-line::before,.index-line::after{content:"";height:1px;background:var(--strong-border);flex:1}
.diagonal-feature{position:relative;min-height:250px;margin:32px 0;background:var(--deep);border:1px solid var(--strong-border);overflow:hidden;border-radius:4px}
.diagonal-feature .copy{position:relative;z-index:2;width:58%;padding:28px 26px}
.diagonal-feature .image-slot{position:absolute;right:0;top:0;width:48%;height:180px;min-height:180px;border:0;border-left:1px solid var(--strong-border);border-bottom:1px solid var(--strong-border);border-radius:0;clip-path:polygon(18% 0,100% 0,100% 100%,0 100%)}
.wide-story{margin:32px 0;padding:28px;background:var(--card);border:1px solid var(--strong-border);box-shadow:var(--shadow);border-radius:5px}
.wide-story .image-slot{height:230px;margin:18px 0 20px}
.spine-pair{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:30px 0}
.spine-card{position:relative;padding:24px 24px 24px 38px;background:var(--soft);border:1px solid var(--border);border-radius:3px;min-height:240px}
.spine-card::before{content:"";position:absolute;left:12px;top:18px;bottom:18px;width:7px;background:linear-gradient(var(--gold),var(--sea));border-radius:2px}
.spine-card .image-slot{height:150px;margin-bottom:16px;background:var(--card)}
.rack-pair{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:30px 0}
.rack-card{padding:0 0 22px;background:var(--card);border:1px solid var(--border);border-radius:4px;overflow:hidden}
.rack-head{height:150px;background:var(--deep);display:flex;align-items:center;justify-content:center;border-bottom:1px solid var(--strong-border)}
.rack-card .rack-copy{padding:20px 22px 0}
.period-flow{margin:30px 0;background:var(--ink);color:var(--paper);border-radius:4px;overflow:hidden}
.period-flow .image-slot{height:180px;border:0;border-radius:0;background:var(--soft)}
.period-row{display:grid;grid-template-columns:140px 1fr;gap:20px;padding:20px 24px;border-top:1px solid rgba(184,148,58,.28)}
.period-row h3{color:var(--sea);margin:0}
.status-board{margin:30px 0;padding:24px;background:var(--card);border:1px solid var(--strong-border);border-radius:4px}
.status-board .image-slot{height:180px;margin-bottom:18px;background:var(--soft)}
.status-item{display:grid;grid-template-columns:90px 1fr;gap:18px;align-items:start;padding:14px 0;border-top:1px solid var(--border)}
.status-item:first-of-type{border-top:0}
.status-tag{display:inline-flex;min-height:34px;align-items:center;justify-content:center;border:1px solid var(--gold);background:var(--soft);color:var(--ink);border-radius:3px;font-size:13px;font-weight:700}
.app-feature{margin:34px 0;padding:30px;background:var(--deep);border:1px solid var(--strong-border);border-radius:5px}
.app-image-wrap{display:grid;grid-template-columns:1fr 72px;align-items:end;gap:14px;margin-top:20px}
.app-image-wrap .image-slot:first-child{height:320px}
.icon-slot{height:72px;display:flex;align-items:center;justify-content:center;background:var(--card);border:1px solid var(--border);border-radius:5px}
.icon-slot img{width:48px;height:48px}
.note-list{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0 0;padding:0;list-style:none}
.note-list li{padding:16px 18px;background:var(--soft);border-left:3px solid var(--gold);border-radius:2px}
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:20px}
.faq-card{padding:18px;background:var(--card);border:1px solid var(--border);border-radius:4px}
.brand-story{margin:34px 0 0;padding:30px;background:var(--ink);color:var(--paper);border-radius:4px}
.brand-story h2{color:var(--sea)}
.brand-story p{color:var(--paper)}
/* inner page layouts */
.single-wide{max-width:840px;margin:0 auto}
.single-wide .feature-image{height:250px;margin:18px 0}
.slant-page .slant-hero{position:relative;min-height:310px;margin-bottom:28px;background:var(--deep);border:1px solid var(--strong-border);overflow:hidden}
.slant-page .slant-copy{width:56%;padding:28px;position:relative;z-index:2}
.slant-page .slant-image{position:absolute;right:0;top:0;width:49%;height:100%;background:var(--card);display:flex;align-items:center;justify-content:center;clip-path:polygon(22% 0,100% 0,100% 100%,0 100%);border-left:1px solid var(--strong-border)}
.slant-page .slant-image img{max-height:100%}
.spine-page{display:grid;grid-template-columns:180px 1fr;gap:26px;align-items:start}
.spine-page .spine-index{position:sticky;top:132px;padding:18px;background:var(--ink);color:var(--paper);border-radius:3px}
.spine-page .spine-index a{display:block;padding:9px 0;border-bottom:1px solid rgba(242,230,200,.18);font-size:13px}
.spine-page .spine-body{min-width:0}
.spine-page .image-slot{height:240px;margin-bottom:18px}
.linear-steps{counter-reset:step;margin:24px 0}
.linear-step{position:relative;padding:22px 24px 22px 74px;background:var(--card);border:1px solid var(--border);border-bottom:0}
.linear-step:last-child{border-bottom:1px solid var(--border)}
.linear-step::before{counter-increment:step;content:counter(step);position:absolute;left:22px;top:22px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--ink);color:var(--sea);border-radius:50%;font-weight:700}
.triad{margin:22px 0}
.triad section{display:grid;grid-template-columns:150px 1fr;gap:20px;padding:24px;background:var(--card);border:1px solid var(--border);border-bottom:0}
.triad section:last-child{border-bottom:1px solid var(--border)}
.triad h2{margin:0;color:var(--gold)}
.status-lines{margin:22px 0;background:var(--card);border:1px solid var(--border)}
.status-line{display:grid;grid-template-columns:120px 1fr;gap:22px;padding:20px 22px;border-bottom:1px solid var(--border)}
.status-line:last-child{border-bottom:0}
.checklist{margin:24px 0;padding:0;list-style:none}
.checklist li{position:relative;padding:18px 18px 18px 52px;background:var(--card);border:1px solid var(--border);border-bottom:0}
.checklist li:last-child{border-bottom:1px solid var(--border)}
.checklist li::before{content:"✓";position:absolute;left:20px;top:18px;color:var(--gold);font-weight:700}
.method-sections{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:24px 0}
.method-sections section{padding:22px;background:var(--card);border-top:4px solid var(--gold);box-shadow:var(--shadow)}
.topic-list{margin:24px 0;border-top:1px solid var(--strong-border)}
.topic-item{display:grid;grid-template-columns:190px 1fr;gap:24px;padding:24px 8px;border-bottom:1px solid var(--strong-border)}
.topic-item h2{margin:0}
.center-card{max-width:760px;margin:26px auto;padding:30px;background:var(--card);border:1px solid var(--strong-border);box-shadow:var(--shadow);text-align:center}
.center-card p{text-align:left}
.center-card .image-slot{height:250px;margin:0 auto 22px}
.app-page-top{max-width:780px;margin:0 auto}
.app-page-top .app-copy{padding:26px;background:var(--card);border:1px solid var(--border)}
.app-page-top .app-visual{display:grid;grid-template-columns:1fr 80px;gap:16px;align-items:end;margin-top:18px}
.app-page-top .app-visual .image-slot{height:320px}
.rules section{padding:22px 0;border-bottom:1px solid var(--border)}
.rules section:last-child{border-bottom:0}
.help-paths{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.help-paths section{padding:20px;background:var(--card);border:1px solid var(--border)}
.qa-list{max-width:860px;margin:0 auto}
.qa-item{padding:22px 0;border-bottom:1px solid var(--strong-border)}
.qa-item h2{font-size:17px}
.contact-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:22px}
.contact-cards section{padding:22px;background:var(--card);border:1px solid var(--border)}
.about-banner{height:200px;margin:8px 0 28px;background:var(--card);border:1px solid var(--strong-border);display:flex;align-items:center;justify-content:center;overflow:hidden}
.about-brand-visual{height:260px;margin:24px 0;background:var(--soft);border:1px solid var(--border);display:flex;align-items:center;justify-content:center}
.site-footer{background:var(--ink);color:var(--paper);border-top:1px solid var(--sea);font-size:13px;padding:34px 0 26px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}
.footer-logo{height:24px;width:auto;max-width:136px}
.footer-brand div{display:flex;flex-direction:column;line-height:1.3}
.footer-brand strong{font-size:16px;color:var(--card)}
.footer-brand span{color:var(--sea);letter-spacing:.08em}
.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:22px 0;border-top:1px solid rgba(184,148,58,.3);border-bottom:1px solid rgba(184,148,58,.3)}
.footer-groups h2{color:var(--sea);font-size:14px;margin-bottom:8px}
.footer-groups a{display:block;color:var(--paper);padding:5px 0}
.footer-groups a:hover,.footer-groups a:focus-visible{color:var(--sea);outline:none;text-decoration:underline}
.footer-note{max-width:780px;margin:20px 0 8px;color:var(--paper)}
.footer-copy{margin:0;color:var(--sea)}
.site-overlay{position:fixed;inset:0;background:rgba(22,18,8,.55);z-index:80;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,visibility .2s ease}
.site-overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}
.curtain{position:fixed;right:18px;top:84px;z-index:90;width:32%;max-width:430px;height:min(80vh,720px);background:var(--card);border:1px solid var(--strong-border);box-shadow:var(--shadow);transform:translateX(calc(100% + 40px));visibility:hidden;pointer-events:none;transition:transform .22s ease,visibility .22s ease;border-radius:5px;overflow:hidden}
.curtain.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}
.curtain-head{height:62px;display:flex;align-items:center;justify-content:space-between;padding:8px 14px;border-bottom:1px solid var(--border);background:var(--soft)}
.curtain-brand{display:flex;align-items:center;gap:10px;color:var(--ink)}
.curtain-logo{height:24px;width:auto;max-width:110px}
.curtain-scroll{height:calc(100% - 62px);overflow-y:auto;padding:16px}
.curtain-group{margin-bottom:18px}
.curtain-group h2{font-size:14px;color:var(--gold);margin-bottom:6px}
.curtain-group a{display:grid;grid-template-columns:70px 1fr;gap:8px;padding:9px 4px;border-bottom:1px solid var(--border)}
.curtain-group a b{color:var(--ink);font-size:14px}
.curtain-group a span{color:var(--muted);font-size:12px}
.curtain-group a:hover,.curtain-group a:focus-visible{background:var(--soft);outline:none}
.search-panel{position:fixed;left:50%;top:82px;z-index:95;width:min(calc(100% - 32px),760px);transform:translate(-50%,-18px);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .18s ease,transform .18s ease,visibility .18s ease}
.search-panel.is-open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}
.search-card{background:var(--card);border:1px solid var(--strong-border);box-shadow:var(--shadow);padding:22px;border-radius:5px}
.search-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:16px}
.search-head strong{font-size:18px;color:var(--ink)}
.search-head p{margin:2px 0 0;color:var(--muted);font-size:13px}
.search-label{display:block;color:var(--muted);font-size:13px;margin-bottom:6px}
.search-input{width:100%;height:44px;border:1px solid var(--gold);background:#fffaf0;color:var(--ink);padding:0 12px;border-radius:3px;outline:none}
.search-input:focus{border-color:var(--sea);box-shadow:0 0 0 2px rgba(184,148,58,.2)}
.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.search-presets a{min-height:44px;display:inline-flex;align-items:center;padding:0 14px;background:var(--soft);border:1px solid var(--border);border-radius:3px}
.search-presets a:hover,.search-presets a:focus-visible{border-color:var(--gold);outline:none}
.search-empty{margin:14px 0 0;color:var(--muted)}
.mobile-bottom{display:none}
@media (max-width:760px){
  body{padding-bottom:calc(48px + env(safe-area-inset-bottom))}
  .top-strip-inner,.brand-bar-inner,.footer-inner,.page-wrap{width:calc(100% - 32px)}
  .wave-nav{display:none}
  .site-main{padding-top:74px;padding-bottom:36px}
  .brand-actions{gap:5px}
  .app-link,.menu-toggle{padding:0 10px}
  .brand-logo{max-width:108px}
  .page-head{padding:32px 0 18px}
  .section,.wide-story,.app-feature,.brand-story{padding:20px}
  .diagonal-feature{min-height:390px}
  .diagonal-feature .copy{width:100%;padding:20px;padding-top:205px}
  .diagonal-feature .image-slot{width:100%;height:180px;clip-path:polygon(0 0,100% 0,100% 82%,12% 100%,0 92%)}
  .spine-pair,.rack-pair,.note-list,.faq-grid,.method-sections,.help-paths,.contact-cards{grid-template-columns:1fr}
  .period-row,.status-item,.status-line,.triad section,.topic-item{grid-template-columns:1fr;gap:8px}
  .status-tag{width:max-content;min-width:90px}
  .app-image-wrap,.app-page-top .app-visual{grid-template-columns:1fr 64px}
  .spine-page{display:block}
  .spine-page .spine-index{position:relative;top:auto;margin-bottom:18px}
  .slant-page .slant-hero{padding-top:190px}
  .slant-page .slant-copy{width:100%;padding:20px}
  .slant-page .slant-image{width:100%;height:190px;clip-path:polygon(0 0,100% 0,100% 82%,14% 100%,0 90%)}
  .footer-groups{grid-template-columns:1fr 1fr;gap:18px}
  .curtain{right:8px;top:70px;width:88%;height:min(80vh,680px)}
  .search-panel{inset:0;top:0;left:0;width:100%;height:100%;transform:none;background:var(--ink);padding:24px 16px;overflow:auto}
  .search-panel.is-open{transform:none}
  .search-card{margin:54px auto 0;max-width:620px;background:var(--ink);border-color:rgba(184,148,58,.55);color:var(--paper);box-shadow:none}
  .search-head strong{color:var(--sea)}
  .search-head p,.search-label,.search-empty{color:var(--paper)}
  .search-card .close-button{background:var(--gold);color:var(--card);border-color:var(--sea)}
  .search-input{background:var(--card);color:var(--ink)}
  .search-presets a{background:var(--gold);color:var(--card);border-color:var(--sea)}
  .mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:60;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(--ink);border-top:1px solid var(--sea)}
  .mobile-bottom a{height:48px;display:flex;align-items:center;justify-content:center;color:var(--paper);font-size:13px}
  .mobile-bottom a.is-current{background:var(--sea);color:var(--ink);font-weight:700}
}
@media (max-width:420px){
  .brand-fallback{font-size:15px}
  .app-link,.menu-toggle{font-size:13px;padding:0 8px}
  .footer-groups{grid-template-columns:1fr}
  .linear-step{padding-left:62px}
  .linear-step::before{left:16px}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important}
}