:root{--bg:#0C100E;--deep:#080A09;--card:#141A16;--sub:#1A2420;--title:#E8F6EE;--text:#CDE3D6;--muted:#8FB3A0;--faint:#6E8F7E;--brand:#2A9D5C;--bright:#3CB371;--darkgreen:#146B3A;--sand:#EFE6D2;--line:rgba(42,157,92,.18);--line-strong:rgba(42,157,92,.45);--shadow:0 12px 28px rgba(8,10,9,.35);--max:1120px}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}.ui-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(--bright);outline-offset:3px}.top-boundary{position:fixed;z-index:70;top:0;left:0;right:0;height:22px;padding:0 max(16px,calc((100vw - var(--max))/2));display:flex;align-items:center;justify-content:space-between;background:#050706;color:var(--bright);border-bottom:1px solid var(--line);font-size:12px}.boundary-brand{white-space:nowrap}.boundary-search{height:22px;border:0;background:transparent;color:var(--bright);padding:0 6px}.site-rail{position:fixed;z-index:69;top:22px;left:0;right:0;height:60px;background:var(--deep);border-bottom:1px solid var(--line-strong);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 max(16px,calc((100vw - var(--max))/2))}.rail-logo{justify-self:start;min-height:44px;display:flex;align-items:center;color:var(--title);font-weight:700;font-size:16px}.rail-logo img,.drawer-brand img,.footer-brand img{height:28px;width:auto;object-fit:contain}.drawer-open{justify-self:center;min-width:84px;height:44px;border:1px solid var(--line-strong);border-radius:10px;background:var(--card);color:var(--text);font-size:14px}.rail-app{justify-self:end;min-height:44px;display:inline-flex;align-items:center;padding:0 16px;border-radius:10px;background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;font-weight:700;font-size:14px}.section-tabs{position:fixed;z-index:68;top:82px;left:0;right:0;height:40px;background:#10331F;border-bottom:1px solid var(--line-strong);display:flex;align-items:center;justify-content:center;gap:8px;padding:0 16px;font-size:13px}.section-tabs a{height:32px;display:inline-flex;align-items:center;padding:0 14px;border-radius:8px;color:var(--sand)}.section-tabs a.is-current{background:var(--brand);color:#08110C;font-weight:700}.site-main{min-height:70vh;padding-top:146px}.page-shell{width:min(var(--max),calc(100% - 32px));margin:0 auto}.page-hero{padding:30px 0 22px;border-bottom:1px solid var(--line)}.eyebrow{margin:0 0 6px;color:var(--bright);font-size:12px;letter-spacing:.08em}.page-hero h1{margin:0;color:var(--title);font-size:24px;line-height:1.3}.page-hero p{max-width:850px;margin:12px 0 0;color:var(--muted)}h2{font-size:20px;line-height:1.35;color:var(--title);margin:0 0 12px}h3{font-size:16px;line-height:1.4;color:var(--title);margin:0 0 8px}p{margin:0 0 12px}.content-section{padding:28px 0;border-bottom:1px solid var(--line)}.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(--card);border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:var(--shadow)}.card p:last-child{margin-bottom:0}.card .meta,.meta{font-size:13px;color:var(--muted)}.number{display:inline-flex;align-items:center;justify-content:center;min-width:38px;height:28px;padding:0 8px;margin-bottom:10px;border-radius:999px;background:var(--brand);color:#08110C;font-size:12px;font-weight:700}.media-slot{width:100%;background:var(--deep);border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.media-banner{height:260px}.media-card{height:180px}.media-feature{height:200px}.media-app{height:360px}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border-radius:10px;font-size:14px;white-space:nowrap;border:1px solid transparent}.btn-primary{background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;font-weight:700}.btn-secondary{background:var(--deep);border-color:var(--line-strong);color:var(--text)}.btn:hover,.rail-app:hover{filter:brightness(1.06)}.home-cover{padding:20px 0 30px}.cover-copy{text-align:center;max-width:850px;margin:18px auto 0}.cover-copy h1{font-size:24px;line-height:1.3;margin:0;color:var(--title)}.cover-copy .lead{font-size:16px;color:var(--sand);margin-top:8px}.cover-copy p{color:var(--muted)}.cover-copy .button-row{justify-content:center}.lesson-list,.plain-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}.lesson-list li,.plain-list li{padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--card)}.timeline{position:relative;margin:0;padding:0 0 0 28px;list-style:none}.timeline:before{content:"";position:absolute;left:8px;top:10px;bottom:10px;width:1px;background:var(--line-strong)}.timeline li{position:relative;margin:0 0 18px;padding:16px 18px;background:var(--card);border:1px solid var(--line);border-radius:12px}.timeline li:before{content:"";position:absolute;left:-25px;top:24px;width:9px;height:9px;border-radius:50%;background:var(--bright);box-shadow:0 0 0 4px var(--bg)}.status{display:inline-flex;align-items:center;height:26px;padding:0 9px;border-radius:999px;background:var(--sub);border:1px solid var(--line-strong);color:var(--sand);font-size:12px}.article-copy{max-width:900px}.article-copy p{margin-bottom:14px}.article-copy ul{margin:8px 0 16px;padding-left:22px}.article-copy li{margin:5px 0}.quote-note{border-left:3px solid var(--brand);background:var(--card);padding:14px 16px;border-radius:0 10px 10px 0;color:var(--muted)}.faq-list{display:grid;gap:12px}.faq-item{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px}.faq-item h2,.faq-item h3{margin-bottom:8px}.index-links{display:flex;flex-wrap:wrap;gap:10px}.index-links a{min-height:44px;display:inline-flex;align-items:center;padding:0 14px;border:1px solid var(--line-strong);border-radius:10px;background:var(--deep);color:var(--text)}.site-footer{margin-top:36px;background:#050706;border-top:1px solid var(--line-strong);color:var(--text);font-size:13px}.footer-inner{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding:28px 0 78px}.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:20px}.footer-brand strong{font-size:16px;color:var(--title)}.footer-brand span{color:var(--muted)}.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.footer-grid section{display:flex;flex-direction:column;gap:7px}.footer-grid h2{font-size:13px;color:var(--sand);margin:0 0 3px}.footer-grid a{color:var(--muted)}.footer-grid a:hover{color:var(--title)}.footer-note{margin-top:22px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted)}.footer-copy{color:var(--faint);margin-bottom:0}.ui-overlay{position:fixed;z-index:80;inset:0;background:rgba(0,0,0,.66);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,visibility .2s ease}.ui-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.drawer-panel{position:fixed;z-index:90;top:0;bottom:0;left:0;width:min(400px,86vw);background:var(--deep);border-right:1px solid var(--line-strong);transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:transform .24s ease,visibility .24s ease;overflow-y:auto}.drawer-panel.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 16px;background:var(--deep);border-bottom:1px solid var(--line)}.drawer-brand{display:flex;align-items:center;gap:10px;color:var(--title)}.drawer-close,.search-head button{min-height:44px;padding:0 14px;border-radius:10px;border:1px solid var(--line-strong);background:var(--card);color:var(--text)}.drawer-groups{padding:10px 16px 28px}.drawer-groups section{padding:12px 0;border-bottom:1px solid var(--line)}.drawer-groups h2{font-size:13px;color:var(--bright);margin-bottom:8px}.drawer-groups a{display:block;padding:10px 8px;border-radius:9px}.drawer-groups a:hover{background:var(--card)}.drawer-groups strong{display:block;color:var(--title);font-size:14px}.drawer-groups span{display:block;color:var(--muted);font-size:12px;line-height:1.55;margin-top:2px}.search-layer{position:fixed;z-index:91;top:82px;left:0;right:0;visibility:hidden;pointer-events:none;transform:translateY(-12px);opacity:0;transition:.2s ease}.search-layer.is-open{visibility:visible;pointer-events:auto;transform:none;opacity:1}.search-card{width:min(720px,calc(100% - 32px));margin:12px auto;background:var(--deep);border:1px solid var(--line-strong);border-radius:14px;padding:18px;box-shadow:var(--shadow)}.search-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px;color:var(--title)}.search-card label{display:block;color:var(--muted);font-size:13px;margin-bottom:6px}.search-card input{width:100%;height:44px;border:1px solid var(--line-strong);border-radius:10px;background:var(--card);color:var(--title);padding:0 12px}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.search-presets a{min-height:40px;display:inline-flex;align-items:center;padding:0 12px;border-radius:9px;background:var(--sub);color:var(--text);border:1px solid var(--line)}.mobile-bottom{display:none}.split-feature{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:18px;align-items:start}.toc-card{position:sticky;top:140px}.mini-tag{display:inline-flex;align-items:center;height:24px;padding:0 8px;border-radius:999px;background:var(--sub);border:1px solid var(--line);color:var(--muted);font-size:12px;margin:0 6px 6px 0}.app-icon{width:48px;height:48px;object-fit:contain;margin-bottom:12px}.notice{padding:14px 16px;border:1px solid var(--line-strong);border-radius:12px;background:#102018;color:var(--sand)}
@media(max-width:760px){.section-tabs{display:none}.site-main{padding-top:104px;padding-bottom:54px}.site-rail{grid-template-columns:1fr auto 1fr;padding:0 16px}.rail-logo img{max-width:112px}.drawer-open{min-width:74px}.rail-app{padding:0 12px}.page-shell{width:calc(100% - 32px)}.grid-2,.grid-3,.grid-4,.split-feature{grid-template-columns:1fr}.media-banner{height:260px}.media-card{height:180px}.media-feature{height:200px}.media-app{height:340px}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-inner{padding-bottom:88px}.mobile-bottom{position:fixed;z-index:60;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#050706;border-top:1px solid var(--line-strong)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;color:var(--muted);font-size:12px}.mobile-bottom a.is-current{background:var(--brand);color:#08110C;font-weight:700}.search-layer{top:0;bottom:0;background:var(--deep);transform:translateY(-100%)}.search-layer.is-open{transform:none}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;padding:24px 16px}.drawer-panel{width:86vw}.toc-card{position:static}.top-boundary{padding:0 16px}.cover-copy{text-align:left}.cover-copy .button-row{justify-content:flex-start}}
@media(max-width:420px){.rail-logo span{font-size:15px}.drawer-open{min-width:64px;padding:0 8px}.rail-app{font-size:13px;padding:0 9px}.footer-grid{grid-template-columns:1fr 1fr}.page-hero{padding-top:24px}.card{padding:16px}}