:root{
    --bg:#F3E8D4;--deep:#E2D2B4;--paper:#FBF3E4;--sub:#EDE0C8;--ink:#1A140A;
    --text:#2C2214;--muted:#5C4A30;--soft:#7C6844;--gold:#7A5A20;--copper:#B88838;
    --border:rgba(26,20,10,.12);--strong:rgba(122,90,32,.50);--shadow:0 12px 28px rgba(26,20,10,.10)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",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{cursor:pointer}
img{display:block;max-width:100%;object-fit:contain;object-position:center}
.shell{width:min(960px,calc(100% - 32px));margin:0 auto}
.site-fixed-head{position:fixed;inset:0 0 auto;z-index:80}
.top-strip{height:20px;background:var(--ink);color:var(--copper);font-size:12px}
.top-strip-inner{height:20px;display:flex;align-items:center;justify-content:space-between}
.plain-trigger{border:0;background:transparent;color:var(--copper);padding:0 6px;height:20px}
.brand-bar{height:54px;background:var(--paper);border-bottom:1px solid var(--strong)}
.brand-bar-inner{height:54px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand-link{display:inline-flex;align-items:center;min-height:44px}
.site-logo{height:24px;width:auto}
.brand-fallback{font-size:16px;font-weight:800;letter-spacing:.08em;color:var(--ink)}
.brand-actions{display:flex;align-items:center;gap:8px}
.small-app-link,.drawer-trigger{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px;border-radius:8px;font-size:14px}
.small-app-link{background:linear-gradient(135deg,#1A140A 0%,#B88838 100%);color:var(--paper)}
.drawer-trigger{border:1px solid var(--strong);background:var(--paper);color:var(--ink)}
.dot-nav{height:42px;background:var(--paper);border-bottom:1px solid var(--border)}
.dot-nav-inner{height:42px;display:flex;align-items:flex-start;justify-content:center;gap:56px}
.dot-link{font-size:13px;min-width:44px;text-align:center;padding-top:5px;color:var(--muted)}
.dot{display:block;width:8px;height:8px;border:1px solid var(--ink);border-radius:50%;margin:0 auto 1px;background:transparent}
.dot-link.is-current .dot{background:var(--copper);border-color:var(--copper)}
.dot-link.is-current{color:var(--ink);font-weight:700}
.site-main{padding-top:116px;padding-bottom:40px}
.hero-section,.page-section{padding:34px 0}
.hero-section h1,.page-hero h1{font-size:24px;line-height:1.3;margin:0 0 12px;color:var(--ink)}
h2{font-size:20px;line-height:1.4;color:var(--ink);margin:0 0 14px}
h3{font-size:16px;line-height:1.5;color:var(--ink);margin:0 0 8px}
p{margin:0 0 14px}
.lead{font-size:18px;color:var(--ink);font-weight:700}
.kicker{font-size:12px;letter-spacing:.12em;color:var(--gold);font-weight:800;text-transform:uppercase}
.intro-index{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.index-pill{min-width:80px;border-bottom:1px solid var(--strong);padding:8px 10px;color:var(--gold);background:rgba(251,243,228,.7);border-radius:8px 8px 0 0}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.btn{min-height:42px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;border-radius:9px;font-size:14px;border:1px solid transparent}
.btn-primary{background:linear-gradient(135deg,#1A140A 0%,#B88838 100%);color:var(--paper)}
.btn-secondary{background:var(--paper);border-color:var(--gold);color:var(--ink)}
.btn:hover,.btn:focus-visible,.small-app-link:hover,.small-app-link:focus-visible{transform:translateY(-1px);box-shadow:0 8px 18px rgba(26,20,10,.12)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--copper);outline-offset:2px}
.media-slot{background:var(--paper);border:1px solid var(--border);border-radius:10px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.media-slot img{width:100%;height:100%;object-fit:contain}
.slot-wide{height:168px}
.slot-banner{height:200px}
.slot-app{height:300px}
.slot-card{height:180px}
.section-card{background:var(--paper);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow);padding:22px}
.cut-layout{display:grid;grid-template-columns:1fr;gap:18px}
.triptych{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.triptych article,.two-card article,.notes-list article,.topic-list article{background:var(--paper);border:1px solid var(--border);border-radius:10px;padding:18px}
.flip-pages{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:stretch}
.flip-pages article{background:var(--paper);border:1px solid var(--strong);border-radius:10px;padding:20px}
.two-card{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.period-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.period-grid article{background:var(--ink);color:var(--paper);border-radius:10px;padding:18px}
.period-grid article h3,.period-grid article h2{color:var(--copper)}
.status-stack{display:grid;gap:10px}
.status-row{display:grid;grid-template-columns:120px 1fr;gap:14px;align-items:center;background:var(--paper);border-left:4px solid var(--gold);padding:14px 16px;border-radius:8px}
.status-label{font-weight:800;color:var(--gold)}
.app-stack{display:grid;grid-template-columns:1fr;gap:18px}
.app-images{display:grid;grid-template-columns:minmax(0,1fr) 64px;gap:12px;align-items:start}
.icon-slot{height:64px}
.read-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.read-grid article{border-top:2px solid var(--copper);padding:16px 0}
.faq-six{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.faq-six article{background:var(--sub);padding:18px;border-radius:10px}
.page-hero{padding:36px 0 22px}
.page-hero .summary{max-width:760px;color:var(--muted)}
.line-index{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}
.line-index a{border:1px solid var(--strong);background:var(--paper);border-radius:999px;padding:7px 12px;font-size:13px}
.center-card{max-width:760px;margin:0 auto;text-align:left}
.center-card .section-card{padding:28px}
.single-column{max-width:760px;margin:0 auto}
.notes-list{display:grid;gap:14px}
.notes-list article{border-left:3px solid var(--copper)}
.memo-list{display:grid;gap:12px}
.memo-item{background:var(--paper);border:1px solid var(--border);border-radius:10px;padding:18px}
.memo-item strong{color:var(--gold)}
.method-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.method-grid section{background:var(--paper);padding:20px;border-radius:10px;border:1px solid var(--border)}
.topic-list{display:grid;gap:14px}
.topic-list article{display:grid;grid-template-columns:150px 1fr;gap:18px;align-items:start}
.topic-no{font-size:28px;color:var(--copper);font-weight:800}
.terms section{padding:18px 0;border-bottom:1px solid var(--border)}
.qa-list{display:grid;gap:14px}
.qa-item{background:var(--paper);border:1px solid var(--border);border-radius:10px;padding:20px}
.qa-item h2{font-size:17px}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.contact-grid article{background:var(--paper);border:1px solid var(--border);border-radius:10px;padding:20px}
.site-footer{background:var(--ink);color:var(--bg);border-top:1px solid var(--copper);padding:34px 0 calc(70px + env(safe-area-inset-bottom))}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}
.footer-logo{height:24px;width:auto}
.footer-brand div{display:flex;align-items:baseline;gap:8px}
.footer-brand strong{font-size:18px;color:var(--paper)}
.footer-brand span{font-size:12px;color:var(--copper);letter-spacing:.14em}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.footer-grid h2{font-size:14px;color:var(--copper);margin-bottom:8px}
.footer-grid a{display:block;font-size:13px;color:var(--bg);padding:4px 0}
.footer-note,.copyright{font-size:13px;color:#D8C7A8}
.footer-note{margin-top:24px;border-top:1px solid rgba(184,136,56,.28);padding-top:18px}
.screen-mask{position:fixed;inset:0;background:rgba(26,20,10,.46);z-index:90;visibility:hidden;pointer-events:none;opacity:0;transition:.2s}
.screen-mask.is-active{visibility:visible;pointer-events:auto;opacity:1}
.site-drawer{position:fixed;z-index:100;left:16px;bottom:16px;width:240px;max-height:380px;background:var(--paper);border:1px solid var(--strong);border-radius:12px;box-shadow:var(--shadow);transform:translateY(calc(100% + 40px));visibility:hidden;pointer-events:none;transition:.24s}
.site-drawer.is-open{transform:translateY(0);visibility:visible;pointer-events:auto}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--border)}
.drawer-brand{display:flex;align-items:center;gap:8px}
.drawer-logo{height:24px;width:auto}
.drawer-brand div{display:flex;gap:5px;align-items:baseline}
.drawer-brand span{font-size:10px;color:var(--gold)}
.drawer-close,.search-head button{min-height:44px;border:0;background:transparent;color:var(--gold)}
.drawer-scroll{overflow:auto;max-height:310px;padding:10px 14px}
.drawer-group{margin-bottom:12px}
.drawer-group h2{font-size:13px;color:var(--gold);margin-bottom:5px}
.drawer-group a{display:block;padding:7px 0;border-bottom:1px solid var(--border)}
.drawer-group b{display:block;font-size:13px;color:var(--ink)}
.drawer-group span{display:block;font-size:12px;color:var(--muted);line-height:1.5}
.search-panel{position:fixed;z-index:101;top:74px;left:50%;width:min(560px,calc(100% - 32px));transform:translate(-50%,-16px);visibility:hidden;pointer-events:none;opacity:0;transition:.2s}
.search-panel.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:translate(-50%,0)}
.search-card{background:var(--paper);border:1px solid var(--strong);border-radius:12px;box-shadow:var(--shadow);padding:18px}
.search-head{display:flex;align-items:center;justify-content:space-between}
.search-head h2{font-size:18px;margin:0}
.search-card label{display:block;font-size:13px;color:var(--muted);margin:12px 0 4px}
.search-card input{width:100%;height:44px;border:1px solid var(--strong);border-radius:8px;background:#fffaf0;padding:0 12px;color:var(--ink)}
.preset-links{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.preset-links a{padding:8px 12px;border-radius:8px;border:1px solid var(--gold);font-size:13px}
.mobile-bottom{display:none}
@media (max-width:720px){
    .dot-nav{display:none}
    .site-main{padding-top:74px;padding-bottom:68px}
    .triptych,.period-grid,.two-card,.read-grid,.faq-six,.method-grid,.contact-grid,.footer-grid{grid-template-columns:1fr}
    .flip-pages{grid-template-columns:1fr}
    .topic-list article{grid-template-columns:1fr}
    .status-row{grid-template-columns:100px 1fr}
    .site-drawer{left:6%;bottom:62px;width:88%;max-height:380px}
    .search-panel{top:0;left:0;width:100%;height:100%;transform:none;background:var(--ink);padding:80px 16px 16px}
    .search-panel.is-open{transform:none}
    .search-card{background:var(--ink);border-color:var(--copper);color:var(--copper);box-shadow:none}
    .search-card h2,.search-card p,.search-card label,.search-head button{color:var(--copper)}
    .search-card input{background:var(--paper)}
    .preset-links a{color:var(--paper);border-color:var(--copper)}
    .mobile-bottom{position:fixed;z-index:70;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--paper);border-top:1px solid var(--strong);display:grid;grid-template-columns:repeat(4,1fr)}
    .mobile-bottom a{min-height:48px;display:flex;align-items:center;justify-content:center;font-size:13px}
    .mobile-bottom a.is-current{background:var(--copper);color:var(--ink);font-weight:800}
    .app-images{grid-template-columns:1fr}
    .icon-slot{width:64px}
}
@media (max-width:420px){
    .shell{width:calc(100% - 32px)}
    .small-app-link,.drawer-trigger{padding:0 10px}
    .hero-section,.page-section{padding:28px 0}
    .section-card{padding:18px}
}