:root{
  --bg:#0C100E;--deep:#080A09;--panel:#141A16;--panel2:#1A2420;--title:#E8F6EE;--text:#CDE3D6;--muted:#8FB3A0;--subtle:#6E8F7E;--green:#2A9D5C;--green2:#3CB371;--green3:#146B3A;--sand:#EFE6D2;--line:rgba(42,157,92,.18);--line2:rgba(42,157,92,.45);--shadow:0 12px 28px rgba(8,10,9,.35);--r:12px;--max:1120px
}
*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--bg)}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit}img{display:block;max-width:100%;height:auto}h1,h2,h3,p{margin-top:0}h1{font-size:24px;line-height:1.3;color:var(--title);margin-bottom:14px}h2{font-size:20px;line-height:1.4;color:var(--title);margin-bottom:12px}h3{font-size:16px;line-height:1.45;color:var(--sand);margin-bottom:8px}p{margin-bottom:14px}.shell{width:min(calc(100% - 32px),var(--max));margin:0 auto}.topline{position:fixed;inset:0 0 auto 0;height:22px;background:var(--deep);border-bottom:1px solid var(--line);z-index:90}.topline-inner{height:22px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--green2)}.plain-button{border:0;background:transparent;color:var(--green2);min-height:22px;padding:0 8px;cursor:pointer}.site-rail{position:fixed;inset:22px 0 auto 0;height:60px;background:#090D0B;border-bottom:1px solid var(--line2);z-index:90}.rail-inner{height:100%;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}.brand-link{display:inline-flex;align-items:center;gap:9px;min-height:44px;width:max-content}.logo-slot{width:auto;min-width:1px;min-height:28px;display:flex;align-items:center}.site-logo{height:28px;width:auto;object-fit:contain;object-position:center}.app-icon{width:48px;height:48px;object-fit:contain;object-position:center}.brand-fallback{font-size:16px;font-weight:800;color:var(--title)}.logo-slot:has(img)+.brand-fallback{display:none}.rail-menu,.drawer-close,.search-close{min-width:74px;min-height:44px;border:1px solid var(--line2);background:var(--deep);color:var(--text);border-radius:10px;cursor:pointer}.rail-app{justify-self:end;display:inline-flex;align-items:center;min-height:44px;padding:0 16px;border-radius:10px;background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;font-size:14px;font-weight:800}.layer-tabs{position:fixed;inset:82px 0 auto 0;height:40px;background:#0E291B;border-bottom:1px solid var(--line2);z-index:85}.tabs-inner{height:40px;display:flex;justify-content:center;align-items:stretch}.tabs-inner a{display:flex;align-items:center;padding:0 18px;font-size:13px;color:var(--text)}.tabs-inner a.is-active{background:var(--green);color:#08110C;font-weight:800}.main-content{padding-top:146px;padding-bottom:44px;min-height:70vh}.page-hero{padding:28px 0 10px}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--green2);font-size:12px;letter-spacing:.08em;margin-bottom:8px}.lead{max-width:780px;color:var(--muted);font-size:15px}.section{padding:24px 0}.section + .section{border-top:1px solid var(--line)}.media-slot{width:100%;height:200px;background:var(--deep);border:1px solid var(--line);border-radius:var(--r);display:flex;align-items:center;justify-content:center;overflow:hidden;box-shadow:var(--shadow)}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.media-slot.banner{height:260px}.media-slot.card-img{height:180px}.media-slot.app-art{height:min(360px,60vw)}.grid-2,.grid-3,.grid-4{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow);min-width:0}.card.soft{background:var(--panel2)}.card p:last-child{margin-bottom:0}.card-link{display:block;transition:transform .18s ease,border-color .18s ease}.card-link:hover{transform:translateY(-2px);border-color:var(--line2)}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 16px;border-radius:10px;font-size:14px;font-weight:800}.btn-primary{background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C}.btn-secondary{background:var(--deep);border:1px solid var(--line2);color:var(--text)}.btn:hover,.rail-app:hover{filter:brightness(1.06)}a:focus-visible,button:focus-visible{outline:2px solid var(--sand);outline-offset:3px}.number-list,.lesson-list,.index-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}.number-list li,.lesson-list li,.index-list li{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start;padding:12px 0;border-bottom:1px solid var(--line)}.number-list li:last-child,.lesson-list li:last-child,.index-list li:last-child{border-bottom:0}.num{display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:34px;border-radius:9px;background:var(--green);color:#08110C;font-weight:900}.tag{display:inline-flex;align-items:center;min-height:28px;padding:2px 9px;border-radius:999px;border:1px solid var(--line2);color:var(--muted);font-size:12px}.status{font-size:12px;color:#08110C;background:var(--green2);padding:3px 8px;border-radius:999px;font-weight:800}.timeline{position:relative;margin-left:8px;padding-left:28px}.timeline:before{content:"";position:absolute;left:6px;top:8px;bottom:8px;width:1px;background:var(--line2)}.timeline-item{position:relative;padding:0 0 22px}.timeline-item:before{content:"";position:absolute;left:-27px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--green2);box-shadow:0 0 0 4px var(--panel)}.quote-note{border-left:3px solid var(--green2);padding:10px 14px;background:var(--deep);color:var(--sand);border-radius:0 10px 10px 0}.article-copy{max-width:860px}.article-copy h2{margin-top:30px}.article-copy h3{margin-top:20px}.article-copy ul{padding-left:20px}.article-copy li{margin:8px 0}.faq-list{display:grid;gap:12px}.faq-item{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:18px}.faq-item h2{font-size:16px}.site-footer{background:#050706;border-top:1px solid var(--line2);padding:34px 0 74px;font-size:13px}.footer-grid{display:grid;grid-template-columns:2fr repeat(4,1fr);gap:22px}.footer-grid section{display:flex;flex-direction:column;align-items:flex-start;gap:6px}.footer-grid h2{font-size:13px;color:var(--green2);margin:0 0 6px}.footer-grid a{color:var(--text);min-height:28px;display:flex;align-items:center}.footer-brand p{color:var(--muted);max-width:430px}.footer-brand-link span:last-child{display:flex;flex-direction:column;line-height:1.25}.footer-brand-link small{font-size:11px;color:var(--muted)}.footer-bottom{padding-top:20px;margin-top:20px;border-top:1px solid var(--line);color:var(--subtle)}.drawer{position:fixed;inset:0 auto 0 0;width:min(400px,86vw);background:#090D0B;z-index:120;transform:translateX(-104%);visibility:hidden;pointer-events:none;transition:transform .22s ease,visibility .22s ease;box-shadow:var(--shadow)}body.drawer-on .drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:72px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line2)}.drawer-scroll{height:calc(100vh - 72px);overflow:auto;padding:14px 16px 28px}.drawer-group{padding:12px 0}.drawer-group h2{font-size:13px;color:var(--green2);margin-bottom:6px}.drawer-group a{display:grid;gap:2px;padding:10px 8px;border-radius:10px}.drawer-group a:hover{background:var(--panel)}.drawer-group strong{font-size:14px;color:var(--title)}.drawer-group span{font-size:12px;color:var(--muted)}.search-layer{position:fixed;inset:82px 0 auto 0;z-index:115;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .18s ease,visibility .18s ease}.search-card{width:min(calc(100% - 32px),780px);margin:12px auto 0;background:#090D0B;border:1px solid var(--line2);border-radius:14px;padding:18px;box-shadow:var(--shadow)}body.search-on .search-layer{visibility:visible;pointer-events:auto;opacity:1}.search-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.search-layer p{color:var(--muted)}.search-presets{display:flex;flex-wrap:wrap;gap:8px}.search-presets a{display:flex;align-items:center;min-height:44px;padding:0 13px;border:1px solid var(--line2);border-radius:10px;color:var(--text)}.overlay{position:fixed;inset:0;background:rgba(0,0,0,.66);z-index:110;visibility:hidden;opacity:0;pointer-events:none;transition:opacity .18s ease,visibility .18s ease}.overlay.is-on{visibility:visible;opacity:1;pointer-events:auto}body.locked{overflow:hidden}.mobile-dock{display:none}.hero-brand{text-align:center;padding:18px 0 0}.hero-brand h1{margin-bottom:8px}.hero-brand .lead{margin-left:auto;margin-right:auto}.mini-title{font-size:13px;color:var(--green2);margin-bottom:6px}.note{color:var(--muted);font-size:13px}.split-feature{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:18px;align-items:stretch}.feature-copy{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:20px}.columns{columns:2;column-gap:28px}.columns p{break-inside:avoid}.kicker-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
@media (max-width:860px){.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,1fr)}.footer-brand{grid-column:1/-1}.split-feature{grid-template-columns:1fr}.columns{columns:1}}
@media (max-width:640px){body{font-size:15px}.layer-tabs{display:none}.main-content{padding-top:102px;padding-bottom:70px}.rail-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:8px}.brand-link{max-width:100%}.rail-app{padding:0 11px}.rail-menu{min-width:64px}.brand-fallback{font-size:15px}.topline-brand{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.grid-2,.grid-4{grid-template-columns:1fr}.media-slot.banner{height:260px}.footer-grid{grid-template-columns:1fr 1fr}.site-footer{padding-bottom:84px}.search-layer{inset:0;background:#090D0B}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;padding:28px 16px}.mobile-dock{position:fixed;display:grid;grid-template-columns:repeat(5,1fr);left:0;right:0;bottom:0;z-index:80;min-height:48px;padding-bottom:env(safe-area-inset-bottom);background:#050706;border-top:1px solid var(--line2)}.mobile-dock a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:12px;color:var(--muted)}.mobile-dock a.is-active{background:var(--green);color:#08110C;font-weight:800}.drawer{z-index:120}.overlay{z-index:110}.actions{display:grid;grid-template-columns:1fr}.btn{width:100%}.footer-brand p{max-width:none}}