:root{
  --paper:#F4EDE0; --paper-deep:#E4D6C0; --content:#FBF6EC; --sub:#EDE3D0;
  --ink:#1C160C; --text:#2A2214; --muted:#5A4A30; --light:#7A6848;
  --gold:#8A6A28; --copper:#C49A3C; --border:rgba(28,22,12,.12);
  --focus:rgba(138,106,40,.50); --shadow:0 12px 28px rgba(28,22,12,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}
body.locked{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{display:block;max-width:100%}
:focus-visible{outline:2px solid var(--copper);outline-offset:3px}
.site-header{position:fixed;inset:0 0 auto;z-index:70}
.gold-rail{height:20px;background:var(--ink);color:var(--copper);font-size:12px}
.rail-inner,.bar-inner,.needle-inner{max-width:960px;height:100%;margin:0 auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between}
.plain-trigger{height:20px;border:0;background:transparent;color:var(--copper);padding:0 8px}
.dark-mark{height:54px;background:var(--content);border-bottom:1px solid rgba(138,106,40,.35)}
.brand-link{display:flex;align-items:center;min-height:44px;max-width:220px}
.brand-logo{height:24px;width:auto;object-fit:contain;object-position:left center}
.brand-fallback{font-size:16px;font-weight:800;color:var(--ink);letter-spacing:.06em}
.header-actions{display:flex;gap:8px;align-items:center}
.header-app,.box-trigger{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px;border:1px solid var(--gold);background:var(--content);color:var(--ink);border-radius:2px;font-size:14px}
.box-trigger{background:var(--ink);color:var(--content)}
.needle-nav{height:44px;background:var(--content);border-bottom:1px solid var(--border)}
.needle-inner{justify-content:center;gap:34px}
.needle-link{height:28px;display:flex;align-items:center;gap:8px;padding:0 8px;border-radius:2px;color:var(--ink);font-size:13px}
.needle{display:inline-block;width:3px;height:22px;background:var(--ink)}
.needle-link.is-current .needle{background:var(--copper)}
.needle-link.is-current{font-weight:800}
.site-main{padding-top:138px;min-height:65vh}
.wrap{max-width:960px;margin:0 auto;padding:28px 16px 46px}
.hero-copy{padding:22px 0 28px;border-bottom:1px solid var(--border)}
.hero-copy h1,.page-head h1{margin:8px 0 12px;font-size:24px;line-height:1.3;color:var(--ink)}
.eyebrow{font-size:12px;letter-spacing:.15em;color:var(--gold);font-weight:800;text-transform:uppercase}
.lead{font-size:16px;color:var(--muted);max-width:760px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.btn,.btn-secondary{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 18px;border-radius:2px;font-size:14px;font-weight:700}
.btn{background:linear-gradient(135deg,#1C160C 0%,#C49A3C 100%);color:var(--content);border:1px solid var(--ink)}
.btn-secondary{background:var(--content);color:var(--ink);border:1px solid var(--gold)}
.home-needles{display:flex;gap:18px;margin-bottom:18px}
.home-needles a{display:flex;align-items:center;gap:8px;font-size:13px}
.home-needles i{display:block;width:3px;height:22px;background:var(--copper)}
.section{padding:34px 0;border-bottom:1px solid var(--border)}
.section h2,.content-section h2{margin:0 0 12px;font-size:20px;line-height:1.35;color:var(--ink)}
.section h3,.content-section h3{margin:0 0 8px;font-size:16px;line-height:1.4;color:var(--ink)}
.section p,.content-section p{margin:0 0 12px}
.split-cards{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.split-card,.stack-card,.fold-card,.shelf-card,.phase-card,.status-row,.memo-item,.topic-row,.policy-block,.center-card,.faq-item{background:var(--content);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:2px}
.split-card{padding:18px}
.stack-list{display:grid;gap:12px}
.stack-card{padding:18px;display:grid;grid-template-columns:72px 1fr;gap:14px;align-items:start}
.stack-card .num{font-size:30px;line-height:1;color:var(--copper);font-weight:800}
.fold-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.fold-card{padding:20px;position:relative}
.fold-card:after{content:"";position:absolute;right:0;bottom:0;border-top:22px solid transparent;border-left:22px solid transparent;border-right:22px solid var(--paper-deep);border-bottom:22px solid var(--paper-deep);opacity:.75}
.shelf-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.shelf-card{padding:18px;border-top:4px solid var(--gold)}
.phase-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.phase-card{padding:18px}
.phase-card b{display:inline-block;margin-bottom:8px;color:var(--gold)}
.status-list{display:grid;gap:10px}
.status-row{display:grid;grid-template-columns:104px 1fr;gap:16px;padding:16px;align-items:start}
.status-tag{display:inline-flex;min-height:34px;align-items:center;justify-content:center;border:1px solid var(--gold);background:var(--sub);color:var(--ink);font-weight:800}
.media-slot{min-height:150px;background:var(--content);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;overflow:hidden}
.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.media-176{height:176px}.media-200{height:200px}.media-220{height:220px}.media-app{height:320px}.media-icon{height:64px;min-height:64px;border:0;background:transparent}
.media-icon img{width:48px;height:48px;object-fit:contain}
.split-card .media-slot,.fold-card .media-slot{margin-bottom:14px}
.app-feature{display:grid;grid-template-columns:minmax(220px,320px) 1fr;gap:26px;align-items:center}
.app-visual{display:grid;gap:10px}
.notes-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.note-box{padding:18px;background:var(--sub);border-left:3px solid var(--gold)}
.brand-copy{max-width:760px}
.page-head{padding:12px 0 24px;border-bottom:1px solid var(--border)}
.page-head .summary{max-width:760px;color:var(--muted)}
.content-section{padding:28px 0;border-bottom:1px solid var(--border)}
.single-record{display:grid;gap:12px}
.record-item{padding:16px 0;border-bottom:1px solid var(--border)}
.record-item:last-child{border-bottom:0}
.parallel-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.parallel-item{background:var(--content);border:1px solid var(--border);padding:18px}
.explain-list{display:grid;gap:0;border-top:1px solid var(--border)}
.explain-row{display:grid;grid-template-columns:150px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--border)}
.memo-list{display:grid;gap:10px}
.memo-item{padding:16px 18px;display:grid;grid-template-columns:28px 1fr;gap:12px}
.memo-mark{width:18px;height:18px;border:2px solid var(--gold);margin-top:4px}
.method-list{counter-reset:method;display:grid;gap:12px}
.method-item{counter-increment:method;padding:18px;background:var(--content);border-left:3px solid var(--gold)}
.method-item:before{content:counter(method,decimal-leading-zero);display:block;font-size:12px;color:var(--gold);font-weight:800;letter-spacing:.12em}
.topic-list{display:grid;gap:12px}
.topic-row{padding:18px}
.center-grid{display:grid;gap:14px;max-width:720px;margin:0 auto}
.center-card{padding:22px;text-align:center}
.policy-list{display:grid;gap:14px}
.policy-block{padding:20px}
.faq-list{display:grid;gap:12px}
.faq-item{padding:18px}
.faq-item h2{font-size:16px}
.about-banner{height:200px;margin-bottom:20px}
.contact-paths{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.contact-path{background:var(--content);border:1px solid var(--border);padding:18px}
.site-footer{background:var(--ink);color:var(--paper);border-top:1px solid var(--copper);padding:34px 0 78px}
.footer-inner{max-width:960px;margin:0 auto;padding:0 16px}
.footer-brand{display:flex;align-items:center;gap:14px;padding-bottom:20px;border-bottom:1px solid rgba(196,154,60,.28)}
.footer-brand-link{display:flex;align-items:center;min-height:44px}
.footer-brand strong{display:block}
.footer-brand span{display:block;color:var(--copper);font-size:12px}
.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:22px 0}
.footer-groups h2{margin:0 0 8px;font-size:13px;color:var(--copper)}
.footer-groups a{display:block;padding:3px 0;font-size:13px;color:var(--paper)}
.footer-note,.copyright{font-size:13px;color:#d7ccb8}
.page-overlay{position:fixed;inset:0;background:rgba(28,22,12,.46);z-index:88;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
.page-overlay.is-active{opacity:1;visibility:visible;pointer-events:auto}
.gold-box{position:fixed;left:50%;bottom:24px;transform:translate(-50%,24px);width:280px;max-height:340px;background:var(--content);border:1px solid var(--gold);box-shadow:0 22px 60px rgba(28,22,12,.28);z-index:95;opacity:0;visibility:hidden;pointer-events:none;transition:.22s;border-radius:2px}
.gold-box.is-open{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}
.gold-box-head,.search-head{height:48px;padding:0 14px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}
.mini-brand{display:flex;align-items:center;gap:8px;font-weight:800}
.icon-close{width:44px;height:44px;border:0;background:transparent;color:inherit;font-size:24px}
.gold-box-scroll{max-height:290px;overflow:auto;padding:10px 14px 14px}
.gold-box-scroll section{padding:8px 0;border-bottom:1px solid var(--border)}
.gold-box-scroll h2{margin:0 0 5px;font-size:12px;color:var(--gold)}
.gold-box-scroll a{display:block;padding:7px 0}
.gold-box-scroll strong{font-size:13px}
.gold-box-scroll span{display:block;font-size:11px;color:var(--light)}
.search-panel{position:fixed;top:74px;left:0;right:0;z-index:96;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-12px);transition:.2s}
.search-panel.is-open{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}
.search-card{max-width:960px;margin:0 auto;background:var(--content);border:1px solid var(--gold);box-shadow:var(--shadow)}
.search-look{display:block;padding:16px}
.search-look span{display:block;margin-bottom:8px;color:var(--muted)}
.search-look input{width:100%;height:44px;border:1px solid var(--gold);background:var(--paper);padding:0 12px;color:var(--ink)}
.search-presets{display:flex;gap:8px;flex-wrap:wrap;padding:0 16px 16px}
.search-presets a{min-height:40px;display:inline-flex;align-items:center;padding:0 14px;border:1px solid var(--gold);background:var(--paper)}
.mobile-bottom{display:none}
@media (hover:hover){
  .header-app:hover,.box-trigger:hover,.btn-secondary:hover,.search-presets a:hover{background:var(--sub)}
  .btn:hover{filter:brightness(1.06)}
  .footer-groups a:hover{color:var(--copper)}
}
@media(max-width:760px){
  .needle-nav{display:none}
  .site-main{padding-top:74px;padding-bottom:64px}
  .rail-inner,.bar-inner{padding:0 16px}
  .header-actions{gap:6px}
  .header-app,.box-trigger{padding:0 10px}
  .brand-link{max-width:150px}
  .wrap{padding:22px 16px 34px}
  .split-cards,.fold-grid,.shelf-grid,.notes-grid,.parallel-list,.contact-paths,.phase-grid{grid-template-columns:1fr}
  .app-feature{grid-template-columns:1fr}
  .app-visual{max-width:320px;margin:0 auto}
  .status-row,.explain-row{grid-template-columns:1fr;gap:8px}
  .gold-box{width:88%;bottom:64px;max-height:70vh}
  .gold-box-scroll{max-height:calc(70vh - 48px)}
  .search-panel{top:0;bottom:0;background:var(--ink);padding:20px 16px;display:flex;align-items:flex-start}
  .search-card{width:100%;max-height:100%;margin:auto 0;background:var(--ink);color:var(--copper);border-color:var(--copper)}
  .search-look span{color:var(--paper)}
  .search-look input{background:var(--content);color:var(--ink)}
  .search-presets a{background:transparent;color:var(--copper);border-color:var(--copper)}
  .mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:75;display:grid;grid-template-columns:repeat(4,1fr);height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--content);border-top:1px solid var(--gold)}
  .mobile-bottom a{min-height:48px;display:flex;align-items:center;justify-content:center;font-size:13px}
  .mobile-bottom a.is-current{background:var(--gold);color:var(--content);font-weight:800}
  .site-footer{padding-bottom:86px}
}