:root{
  --bg:#F2E6C8;
  --deep:#E0D2AE;
  --paper:#FBF4E2;
  --soft:#EBE0C4;
  --ink:#161208;
  --text:#2A2210;
  --muted:#5A4A28;
  --subtle:#7A6840;
  --darkgold:#5C4814;
  --gold:#B8943A;
  --border:rgba(22,18,8,.12);
  --border-strong:rgba(92,72,20,.50);
  --shadow:0 12px 28px rgba(22,18,8,.10);
  --radius:4px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg)}
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}
body.ui-locked{overflow:hidden}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:none}
button,input{font:inherit}
button{border:0;background:none;color:inherit}
img{display:block;max-width:100%;height:auto}
.wrap{width:min(960px,calc(100% - 32px));margin:0 auto}
.site-main{padding-top:126px;min-height:65vh}
.section-gap{margin-top:36px;margin-bottom:36px}
.eyebrow{margin:0 0 8px;color:var(--darkgold);font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}
h1,h2,h3,p{overflow-wrap:anywhere}
h1{margin:0;font-size:24px;line-height:1.3;color:var(--ink)}
h2{margin:0 0 12px;font-size:20px;line-height:1.4;color:var(--ink)}
h3{margin:0 0 8px;font-size:16px;line-height:1.45;color:var(--ink)}
p{margin:0 0 14px}
.lead{margin:10px 0 12px;font-size:17px;font-weight:700;color:var(--darkgold)}
.text-link{display:inline-flex;min-height:44px;align-items:center;color:var(--darkgold);font-weight:700;border-bottom:1px solid var(--border-strong)}
.text-link:hover,.text-link:focus-visible{color:var(--ink)}
.btn{display:inline-flex;min-height:42px;padding:0 18px;align-items:center;justify-content:center;border-radius:4px;font-size:14px;font-weight:700;white-space:nowrap;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.btn:focus-visible,.text-link:focus-visible,.head-app-link:focus-visible,.menu-button:focus-visible,.text-button:focus-visible,.close-button:focus-visible,.footer-grid a:focus-visible,.drawer a:focus-visible,.mobile-nav a:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.btn.primary{color:var(--paper);background:linear-gradient(135deg,#161208 0%,#B8943A 100%)}
.btn.secondary{color:var(--ink);background:var(--paper);border:1px solid var(--darkgold)}
.button-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.image-slot{background:var(--paper);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;overflow:hidden}
.image-slot img{width:100%;height:100%;object-fit:contain;object-position:center}

/* fixed header */
.site-header{position:fixed;z-index:50;inset:0 0 auto;background:var(--paper);box-shadow:0 2px 10px rgba(22,18,8,.06)}
.top-strip{height:20px;background:var(--ink);color:var(--gold);font-size:12px;line-height:20px}
.top-strip-inner{height:20px;display:flex;align-items:center;justify-content:space-between}
.brand-mini{font-weight:700;letter-spacing:.03em}
.text-button{height:20px;min-width:44px;cursor:pointer;color:var(--gold);font-size:12px;padding:0 4px}
.main-head{height:54px;background:var(--paper);border-bottom:1px solid var(--border-strong)}
.main-head-inner{height:54px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand-link{display:flex;align-items:center;min-height:44px;max-width:210px}
.logo-img{height:24px;width:auto;max-width:160px;object-fit:contain;object-position:left center}
.brand-fallback{font-size:16px;font-weight:800;color:var(--ink);letter-spacing:.08em}
.head-actions{display:flex;align-items:center;gap:8px}
.head-app-link,.menu-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 13px;border-radius:4px;font-size:14px;font-weight:700;cursor:pointer}
.head-app-link{background:linear-gradient(135deg,#161208 0%,#B8943A 100%);color:var(--paper)}
.menu-button{border:1px solid var(--darkgold);background:var(--paper);color:var(--ink)}
.wave-nav{height:40px;background:var(--paper)}
.wave-inner{height:40px;display:flex;align-items:center;justify-content:center;gap:34px}
.wave-link{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:82px;height:40px;font-size:13px;color:var(--muted)}
.wave-mark{position:absolute;top:5px;width:66px;height:6px;border:1px solid var(--darkgold);border-radius:50% 50% 45% 55%/60% 40% 60% 40%;transform:skewX(-18deg)}
.wave-link.is-current .wave-mark{background:var(--gold);border-color:var(--gold)}
.wave-link.is-current{color:var(--ink);font-weight:700}

/* drawer/search */
.overlay{position:fixed;z-index:70;inset:0;background:rgba(22,18,8,.46);opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
.overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}
.drawer{position:fixed;z-index:80;top:74px;right:16px;width:min(32vw,430px);max-height:80vh;background:var(--paper);border:1px solid var(--border-strong);box-shadow:var(--shadow);transform:translateX(calc(100% + 40px));opacity:0;visibility:hidden;pointer-events:none;transition:.22s ease;overflow:auto;border-radius:4px}
.drawer.is-open{transform:translateX(0);opacity:1;visibility:visible;pointer-events:auto}
.drawer-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px;border-bottom:1px solid var(--border);background:var(--paper)}
.drawer-brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink)}
.close-button{min-height:44px;min-width:54px;cursor:pointer;border:1px solid var(--darkgold);border-radius:4px;background:var(--paper);color:var(--ink)}
.drawer-groups{padding:0 14px 14px}
.drawer-groups section{padding:14px 0;border-bottom:1px solid var(--border)}
.drawer-groups section:last-child{border-bottom:0}
.drawer-groups h2{font-size:13px;margin-bottom:7px;color:var(--darkgold)}
.drawer-groups a{display:grid;grid-template-columns:74px 1fr;gap:10px;padding:8px 0;min-height:44px}
.drawer-groups strong{color:var(--ink);font-size:14px}
.drawer-groups span{color:var(--muted);font-size:12px;line-height:1.55}
.search-panel{position:fixed;z-index:85;top:74px;left:50%;width:min(720px,calc(100% - 32px));transform:translate(-50%,-14px);opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
.search-panel.is-open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}
.search-card{background:var(--paper);border:1px solid var(--border-strong);box-shadow:var(--shadow);padding:16px;border-radius:4px}
.search-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px;color:var(--ink)}
.search-card p{color:var(--muted)}
.search-presets{display:flex;gap:8px;flex-wrap:wrap}
.search-presets a{display:inline-flex;min-height:44px;align-items:center;padding:0 15px;border:1px solid var(--darkgold);background:var(--paper);border-radius:4px;color:var(--ink);font-weight:700}
.search-presets a:hover{background:var(--soft)}
.mobile-nav{display:none}

/* footer */
.site-footer{margin-top:56px;background:var(--ink);color:var(--bg);border-top:1px solid var(--gold)}
.footer-inner{padding:30px 0 26px}
.footer-brand{display:flex;align-items:center;gap:9px;margin-bottom:20px;color:var(--bg)}
.footer-brand strong{font-size:16px}.footer-brand span{font-size:12px;color:var(--gold);letter-spacing:.08em}
.footer-logo{filter:none;max-width:130px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.footer-grid section{display:flex;flex-direction:column;gap:6px}
.footer-grid h2{font-size:13px;color:var(--gold);margin:0 0 5px}
.footer-grid a{font-size:13px;color:var(--bg);min-height:28px;display:inline-flex;align-items:center;width:max-content;max-width:100%}
.footer-note{margin:22px 0 0;padding-top:18px;border-top:1px solid rgba(184,148,58,.35);font-size:13px;color:var(--bg)}
.copyright{margin:8px 0 0;font-size:13px;color:var(--gold)}

/* home */
.home-intro{padding-top:26px}
.index-wave{width:220px;height:20px;display:flex;align-items:center;gap:7px;margin-bottom:16px}
.index-wave span{display:block;height:6px;flex:1;border:1px solid var(--darkgold);border-radius:50%;transform:skewX(-18deg)}
.index-wave span:first-child{background:var(--gold);border-color:var(--gold)}
.home-intro>p:not(.eyebrow):not(.lead){max-width:760px}
.home-intro .btn{margin-top:6px}
.slant-feature{display:grid;grid-template-columns:1.1fr .9fr;min-height:250px;border:1px solid var(--border);background:var(--paper);box-shadow:var(--shadow);overflow:hidden}
.slant-copy{padding:28px 32px 28px 28px}
.slant-slot{min-height:180px;clip-path:polygon(16% 0,100% 0,100% 100%,0 100%);border:0;border-left:1px solid var(--border)}
.wide-card{display:grid;grid-template-columns:.9fr 1.1fr;background:var(--paper);border:1px solid var(--border-strong)}
.wide-image{min-height:290px;border:0;border-right:1px solid var(--border)}
.wide-copy{padding:28px}
.section-title{margin-bottom:16px}
.spine-list{display:grid;gap:12px}
.spine-card{display:grid;grid-template-columns:150px 1fr;gap:20px;align-items:center;padding:16px;background:var(--paper);border-left:8px solid var(--darkgold);border-top:1px solid var(--border);border-right:1px solid var(--border);border-bottom:1px solid var(--border)}
.spine-card+.spine-card{grid-template-columns:1fr}
.spine-image{height:140px}
.shelf-head{display:grid;grid-template-columns:1fr 250px;gap:20px;align-items:center;background:var(--ink);color:var(--paper);padding:20px}
.shelf-head h2{color:var(--paper)}.shelf-head .eyebrow{color:var(--gold)}
.shelf-image{height:150px;background:var(--soft)}
.shelf-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.shelf-cards article{padding:20px;background:var(--paper);border:1px solid var(--border)}
.shelf-cards a{color:var(--darkgold);font-weight:700}
.period-section{border:1px solid var(--border);background:var(--paper)}
.period-image{height:190px;border:0;border-bottom:1px solid var(--border)}
.period-grid{display:grid;grid-template-columns:repeat(3,1fr)}
.period-grid article{padding:18px;border-right:1px solid var(--border)}
.period-grid article:last-child{border-right:0}
.period-grid strong{display:block;margin-bottom:6px;color:var(--darkgold)}
.timeline-section{display:grid;grid-template-columns:1fr 180px;gap:20px;align-items:start}
.timeline-copy{grid-column:1/2}
.timeline-list{grid-column:2/3;grid-row:1/3;display:flex;flex-direction:column;gap:10px}
.timeline-list span{display:flex;align-items:center;justify-content:center;min-height:52px;background:var(--paper);border:1px solid var(--border-strong);font-weight:700;color:var(--ink)}
.timeline-image{height:180px;grid-column:1/2}
.app-home{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:start;background:var(--soft);padding:26px;border:1px solid var(--border)}
.app-shot{height:300px}
.app-visuals{display:grid;gap:14px}
.app-icon-wrap{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.app-icon{width:48px;height:48px;object-fit:contain}
.reading-points,.brand-story{padding:24px;background:var(--paper);border:1px solid var(--border)}
.faq-preview{padding:24px;border-top:1px solid var(--border-strong);border-bottom:1px solid var(--border-strong)}
details{border-bottom:1px solid var(--border);padding:12px 0}
summary{cursor:pointer;color:var(--ink);font-weight:700;min-height:44px;display:flex;align-items:center}
details p{padding:0 0 4px;color:var(--muted)}

/* inner general */
.inner-hero{padding-top:32px;padding-bottom:10px}
.inner-hero>p:last-child{max-width:760px;color:var(--muted)}
.single-wide-stack{display:grid;gap:18px}
.feature-note{display:grid;grid-template-columns:.9fr 1.1fr;background:var(--paper);border:1px solid var(--border)}
.note-image{min-height:320px;border:0;border-right:1px solid var(--border)}
.feature-note>div:last-child{padding:26px}
.text-panel{padding:24px;background:var(--paper);border:1px solid var(--border)}
.accent-panel{border-left:6px solid var(--darkgold)}
.slant-page-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center}
.tall-slot{height:220px}
.slant-sections{display:grid;gap:12px}
.slant-sections article{position:relative;padding:24px 24px 24px 76px;background:var(--paper);border:1px solid var(--border);clip-path:polygon(0 0,100% 0,97% 100%,2% 100%)}
.step-label{position:absolute;left:22px;top:22px;font-size:22px;font-weight:800;color:var(--gold)}
.book-hero{max-width:760px;margin-left:auto;margin-right:auto}
.spine-page{display:grid;gap:12px}
.book-spine{display:grid;grid-template-columns:1fr;gap:20px;padding:22px 22px 22px 30px;background:var(--paper);border:1px solid var(--border);border-left:10px solid var(--darkgold);box-shadow:3px 4px 0 rgba(92,72,20,.10)}
.book-spine.major{grid-template-columns:230px 1fr;align-items:center}
.book-cover{height:230px}
.narrow-hero,.checklist-hero,.method-hero,.legal-hero,.help-hero,.faq-hero,.contact-hero,.install-hero{max-width:760px}
.narrow-column{max-width:760px;display:grid;gap:22px}
.column-image{height:280px}
.narrow-column article{padding-bottom:18px;border-bottom:1px solid var(--border-strong)}
.period-page{display:grid;gap:18px}
.period-banner{height:220px}
.period-block{display:grid;grid-template-columns:110px 1fr;gap:22px;padding:22px;background:var(--paper);border:1px solid var(--border)}
.period-name{display:flex;align-items:flex-start;justify-content:center;padding:12px 8px;background:var(--ink);color:var(--gold);font-weight:800;font-size:18px}
.status-page{display:grid;gap:14px}
.status-image{height:230px}
.status-row{display:grid;grid-template-columns:120px 1fr;gap:20px;align-items:start;padding:20px;background:var(--paper);border:1px solid var(--border)}
.status-pill{display:inline-flex;min-height:40px;align-items:center;justify-content:center;padding:0 12px;border:1px solid var(--darkgold);font-weight:800;color:var(--ink);background:var(--soft)}
.status-pill.done{background:var(--ink);color:var(--paper)}
.status-pill.working{background:var(--gold);color:var(--ink)}
.status-pill.waiting{background:var(--paper)}
.checklist-page{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.checklist-image{grid-column:1/-1;height:230px}
.check-card{padding:22px;background:var(--paper);border:1px solid var(--border)}
.check-card ul{margin:0 0 14px;padding-left:20px;color:var(--muted)}
.check-card li{margin-bottom:7px}
.method-page{display:grid;gap:14px}
.method-page article{display:grid;grid-template-columns:54px 1fr;column-gap:18px;padding:22px;background:var(--paper);border:1px solid var(--border)}
.method-page article>span{grid-row:1/4;font-size:24px;font-weight:800;color:var(--gold)}
.method-page article>h2,.method-page article>p{grid-column:2/3}
.topic-list{display:grid;gap:12px}
.topic-list article{display:grid;grid-template-columns:72px 1fr;gap:18px;padding:22px;border-bottom:1px solid var(--border-strong);background:var(--paper)}
.topic-no{font-size:34px;font-weight:800;color:var(--gold);line-height:1}
.topic-note{padding:18px;background:var(--ink);color:var(--paper)}
.center-hero{text-align:center;max-width:760px}
.center-hero>p:last-child{margin-left:auto;margin-right:auto}
.centered-cards{max-width:760px;display:grid;gap:14px}
.center-image{height:230px}
.centered-cards article{padding:22px;background:var(--paper);border:1px solid var(--border);text-align:center}
.centered-cards article a{display:inline-flex;min-height:44px;align-items:center;color:var(--darkgold);font-weight:700}
.app-page{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:start}
.app-long-copy{padding:24px;background:var(--paper);border:1px solid var(--border)}
.app-long-copy h2:not(:first-child){margin-top:22px}
.app-page-visuals{position:sticky;top:132px;display:grid;gap:14px}
.app-shot.large{height:320px}
.app-meta{display:flex;gap:12px;align-items:center;padding:14px;background:var(--paper);border:1px solid var(--border)}
.app-meta p{margin:2px 0 0;font-size:12px;color:var(--muted)}
.install-page{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.install-page article{padding:22px;background:var(--paper);border:1px solid var(--border)}
.install-page .accent-panel{grid-column:1/-1}
.legal-page{display:grid;gap:12px}
.legal-page article{padding:22px;background:var(--paper);border-left:5px solid var(--darkgold);border-top:1px solid var(--border);border-right:1px solid var(--border);border-bottom:1px solid var(--border)}
.help-page{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.help-page article{padding:22px;background:var(--paper);border:1px solid var(--border)}
.help-page a{display:inline-flex;min-height:44px;align-items:center;color:var(--darkgold);font-weight:700}
.faq-page{display:grid;gap:0;background:var(--paper);padding:0 22px;border:1px solid var(--border)}
.faq-page details p{padding:0 0 12px;max-width:820px}
.contact-page{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.contact-page article,.contact-notice{padding:22px;background:var(--paper);border:1px solid var(--border)}
.contact-notice{grid-column:1/-1;background:var(--ink);color:var(--paper);border-color:var(--gold)}
.contact-notice h2{color:var(--gold)}
.about-hero{display:grid;grid-template-columns:1fr;gap:18px}
.about-banner{height:200px}
.about-page{display:grid;gap:14px}
.about-page article{max-width:820px;padding:22px;background:var(--paper);border:1px solid var(--border)}
.about-page article:nth-child(even){margin-left:auto}
.brand-reserve{height:220px}

@media (max-width:760px){
  body{padding-bottom:calc(48px + env(safe-area-inset-bottom))}
  .site-main{padding-top:86px}
  .wave-nav{display:none}
  .main-head-inner{gap:8px}
  .brand-link{max-width:130px}
  .logo-img{max-width:118px}
  .head-actions{gap:6px}
  .head-app-link,.menu-button{padding:0 10px;min-width:64px}
  .drawer{top:74px;right:8px;width:88vw;max-height:80vh}
  .search-panel{inset:0;width:100%;height:100%;transform:none;background:var(--ink);opacity:0}
  .search-panel.is-open{transform:none;opacity:1}
  .search-card{min-height:100%;border:0;border-radius:0;background:var(--ink);color:var(--gold);padding:calc(24px + env(safe-area-inset-top)) 18px 84px;box-shadow:none}
  .search-card-head{color:var(--gold)}
  .search-card p{color:var(--bg)}
  .search-presets{display:grid;grid-template-columns:1fr 1fr}
  .search-presets a{background:transparent;color:var(--gold);border-color:var(--gold)}
  .search-card .close-button{background:transparent;color:var(--gold);border-color:var(--gold)}
  .mobile-nav{position:fixed;z-index:60;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(--ink);border-top:1px solid var(--gold)}
  .mobile-nav a{display:flex;align-items:center;justify-content:center;min-height:48px;color:var(--bg);font-size:13px}
  .mobile-nav a.is-current{background:var(--gold);color:var(--ink);font-weight:800}
  .footer-inner{padding-bottom:30px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:18px}
  .slant-feature,.wide-card,.app-home,.feature-note,.slant-page-hero,.app-page{grid-template-columns:1fr}
  .slant-slot{clip-path:none;border-left:0;border-top:1px solid var(--border);height:180px}
  .wide-image{min-height:220px;border-right:0;border-bottom:1px solid var(--border)}
  .spine-card{grid-template-columns:105px 1fr;gap:14px}.spine-image{height:105px}
  .shelf-head{grid-template-columns:1fr}.shelf-image{height:140px}
  .shelf-cards{grid-template-columns:1fr}
  .period-grid{grid-template-columns:1fr}.period-grid article{border-right:0;border-bottom:1px solid var(--border)}.period-grid article:last-child{border-bottom:0}
  .timeline-section{grid-template-columns:1fr}.timeline-copy,.timeline-list,.timeline-image{grid-column:1;grid-row:auto}.timeline-list{flex-direction:row;flex-wrap:wrap}.timeline-list span{flex:1;min-width:90px}
  .app-shot{height:260px}
  .book-spine.major{grid-template-columns:1fr}.book-cover{height:210px}
  .period-block{grid-template-columns:1fr}.period-name{justify-content:flex-start}
  .status-row{grid-template-columns:1fr}.status-pill{width:max-content}
  .checklist-page,.install-page,.help-page,.contact-page{grid-template-columns:1fr}
  .checklist-image,.install-page .accent-panel,.contact-notice{grid-column:1}
  .method-page article{grid-template-columns:42px 1fr;padding:18px}.method-page article>span{font-size:20px}
  .topic-list article{grid-template-columns:44px 1fr}.topic-no{font-size:24px}
  .app-page-visuals{position:static}.app-shot.large{height:300px}
  .about-page article:nth-child(even){margin-left:0}
}

@media (max-width:480px){
  .wrap{width:calc(100% - 32px)}
  .head-app-link{font-size:13px}.menu-button{font-size:13px}
  .home-intro{padding-top:22px}
  .slant-copy,.wide-copy,.reading-points,.brand-story,.faq-preview{padding:20px}
  .spine-card{grid-template-columns:1fr}.spine-image{height:160px}
  .drawer-groups a{grid-template-columns:64px 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .search-presets{grid-template-columns:1fr}
  .feature-note>div:last-child{padding:20px}.note-image{min-height:220px;border-right:0;border-bottom:1px solid var(--border)}
  .slant-sections article{padding:20px 18px 20px 62px;clip-path:none}.step-label{left:18px;top:18px}
  .period-banner,.status-image,.center-image,.brand-reserve{height:190px}
  .column-image{height:220px}
}