:root{--bg:#0C100E;--bg-deep:#080A09;--panel:#141A16;--panel-2:#1A2420;--title:#E8F6EE;--text:#CDE3D6;--muted:#8FB3A0;--soft:#6E8F7E;--green:#2A9D5C;--green-light:#3CB371;--green-deep:#146B3A;--sand:#EFE6D2;--border:rgba(42,157,92,.18);--border-strong:rgba(42,157,92,.45);--shadow:0 12px 28px rgba(8,10,9,.35);--max:1120px;--top-h:22px;--bar-h:60px;--tabs-h:40px}
*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--bg-deep)}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit}img{display:block;max-width:100%}a,button{outline:none}a:focus-visible,button:focus-visible{box-shadow:0 0 0 3px rgba(60,179,113,.35);border-radius:8px}.ui-locked{overflow:hidden}.topline{position:fixed;inset:0 0 auto 0;height:var(--top-h);z-index:80;background:#050706;border-bottom:1px solid var(--border)}.topline-inner{width:min(var(--max),calc(100% - 32px));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between;color:var(--green-light);font-size:12px;line-height:1}.text-action{border:0;background:transparent;color:var(--green-light);cursor:pointer;min-height:22px;padding:0 6px}.sitebar{position:fixed;top:var(--top-h);left:0;right:0;height:var(--bar-h);z-index:79;background:#080A09;border-bottom:1px solid var(--border-strong)}.sitebar-inner{width:min(var(--max),calc(100% - 32px));height:100%;margin:auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px}.brand-link{justify-self:start;min-width:44px;min-height:44px;display:flex;align-items:center}.brand-logo{height:28px;width:auto;object-fit:contain;object-position:center}.app-icon{width:48px;height:48px;object-fit:contain;object-position:center;flex:0 0 48px}.brand-fallback{font-size:16px;font-weight:800;color:var(--title);letter-spacing:.04em}.menu-button,.app-link,.button,.close-button{min-height:44px;border-radius:10px;border:1px solid var(--border-strong);display:inline-flex;align-items:center;justify-content:center;padding:0 16px;white-space:nowrap;cursor:pointer}.menu-button{justify-self:center;background:#0F1512;color:var(--text)}.app-link{justify-self:end;background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;font-weight:800}.subtabs{position:fixed;top:calc(var(--top-h) + var(--bar-h));left:0;right:0;height:var(--tabs-h);z-index:70;background:#0E2D1D;border-bottom:1px solid var(--border-strong)}.subtabs-inner{width:min(var(--max),calc(100% - 32px));height:100%;margin:auto;display:flex;justify-content:center;align-items:stretch;gap:8px}.subtabs a{font-size:13px;color:var(--text);display:flex;align-items:center;padding:0 18px}.subtabs a.is-active{background:var(--green);color:#08110C;font-weight:800}.site-main{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding-top:calc(var(--top-h) + var(--bar-h) + var(--tabs-h) + 32px);padding-bottom:64px}.page-head{padding:28px 0 20px;border-bottom:1px solid var(--border);margin-bottom:24px}.eyebrow{font-size:12px;color:var(--green-light);letter-spacing:.08em;margin:0 0 8px}.page-head h1,.hero-copy h1{font-size:24px;line-height:1.3;color:var(--title);margin:0 0 12px}.page-head p,.hero-copy p{margin:0;max-width:780px;color:var(--muted)}h2{font-size:20px;line-height:1.4;color:var(--title);margin:0 0 12px}h3{font-size:16px;line-height:1.45;color:var(--title);margin:0 0 8px}p{margin:0 0 14px}.section{margin-top:34px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}.section-head p{color:var(--muted);margin:0;max-width:660px}.hero{padding-top:8px}.hero-media,.media-slot,.media-tall{width:100%;background:var(--bg-deep);border:1px solid var(--border);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden}.hero-media{height:260px}.media-slot{height:180px}.media-wide{height:200px}.media-tall{height:min(360px,60vw)}.hero-media img,.media-slot img,.media-tall img{width:100%;height:100%;object-fit:contain;object-position:center}.hero-copy{padding:22px 0 10px}.hero-copy .brand-note{color:var(--green-light);font-size:13px;margin-bottom:8px}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.button{height:42px;min-height:42px;font-size:14px;font-weight:800}.button.primary{background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;border-color:transparent}.button.secondary{background:#0A0E0C;color:var(--text);border-color:var(--border-strong)}.button:hover,.app-link:hover,.menu-button:hover{transform:translateY(-1px)}.grid-3,.grid-2,.grid-4{display:grid;gap:16px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow)}.card p{color:var(--muted)}.card .media-slot{margin:-18px -18px 16px;width:calc(100% + 36px);border:0;border-bottom:1px solid var(--border);border-radius:12px 12px 0 0}.link-row{display:flex;flex-wrap:wrap;gap:9px;margin-top:12px}.text-link{color:var(--sand);border-bottom:1px solid var(--border-strong)}.number-list{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.number-item{background:var(--panel-2);border:1px solid var(--border);border-radius:10px;padding:14px}.number-item b{display:block;color:var(--green-light);font-size:12px;margin-bottom:6px}.lesson-list,.article-list,.sound-list{display:grid;gap:10px}.lesson-list>div,.article-list>a,.sound-list>div{padding:14px 16px;background:var(--panel);border:1px solid var(--border);border-radius:10px}.article-list>a:hover{border-color:var(--border-strong);background:var(--panel-2)}.timeline{position:relative;padding-left:26px;display:grid;gap:16px}.timeline:before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:1px;background:var(--border-strong)}.timeline-item{position:relative;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:16px}.timeline-item:before{content:"";position:absolute;left:-24px;top:23px;width:9px;height:9px;border-radius:50%;background:var(--green-light);box-shadow:0 0 0 5px #0C100E}.status{display:inline-flex;align-items:center;min-height:28px;padding:0 9px;border-radius:999px;background:var(--green);color:#08110C;font-size:12px;font-weight:800;margin-bottom:8px}.prose{max-width:860px}.prose h2{margin-top:28px}.prose p,.prose li{color:var(--text)}.prose ul,.prose ol{padding-left:1.2em}.note{padding:16px 18px;border-left:3px solid var(--green-light);background:#101713;border-radius:0 10px 10px 0;color:var(--muted)}.terms{display:grid;gap:16px}.terms section{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px}.definition-list{display:grid;gap:12px}.definition-list div{display:grid;grid-template-columns:150px 1fr;gap:14px;padding:14px 0;border-bottom:1px solid var(--border)}.definition-list div:last-child{border-bottom:0}.definition-list dt{color:var(--sand);font-weight:800}.definition-list dd{margin:0;color:var(--muted)}.faq-list{display:grid;gap:14px}.faq-item{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px}.faq-item h2{font-size:16px}.faq-item p{color:var(--muted);margin:0}.site-footer{background:#050706;border-top:1px solid var(--border-strong);padding:34px 0 calc(34px + env(safe-area-inset-bottom))}.footer-inner{width:min(var(--max),calc(100% - 32px));margin:auto}.footer-brand{display:grid;grid-template-columns:minmax(260px,420px) 1fr;gap:28px;padding-bottom:24px;border-bottom:1px solid var(--border)}.footer-brandline{display:flex;align-items:center;gap:10px}.footer-brandline strong{color:var(--title)}.footer-brand p{color:var(--muted);font-size:13px;margin:0}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:24px 0}.footer-groups section{display:flex;flex-direction:column;gap:7px}.footer-groups h2{font-size:13px;color:var(--green-light);margin:0 0 4px}.footer-groups a{font-size:13px;color:var(--text)}.footer-bottom{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;color:var(--muted);padding-top:16px;border-top:1px solid var(--border)}.drawer{position:fixed;top:0;bottom:0;left:0;width:min(400px,86vw);z-index:110;background:#080A09;border-right:1px solid var(--border-strong);box-shadow:var(--shadow);transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:transform .2s ease,visibility .2s ease}.drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:68px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px;color:var(--title);font-weight:800}.close-button{min-height:40px;background:#101713;color:var(--text);border-color:var(--border-strong)}.drawer-scroll{height:calc(100% - 68px);overflow:auto;padding:14px 16px 28px}.drawer-group{margin-bottom:20px}.drawer-group h2{font-size:13px;color:var(--green-light);margin:0 0 8px}.drawer-group a{display:block;padding:11px 12px;border-radius:10px;border:1px solid transparent}.drawer-group a:hover{background:var(--panel);border-color:var(--border)}.drawer-group strong{display:block;font-size:14px;color:var(--title)}.drawer-group span{display:block;font-size:12px;color:var(--muted);margin-top:2px}.search-panel{position:fixed;top:calc(var(--top-h) + var(--bar-h));left:0;right:0;z-index:105;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .18s ease}.search-panel.is-open{visibility:visible;pointer-events:auto;opacity:1}.search-card{width:min(760px,calc(100% - 32px));margin:12px auto 0;background:#080A09;border:1px solid var(--border-strong);border-radius:14px;box-shadow:var(--shadow);padding:18px}.search-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.search-card p{color:var(--muted)}.search-links{display:flex;flex-wrap:wrap;gap:10px}.search-links a{min-height:44px;display:inline-flex;align-items:center;padding:0 14px;background:var(--panel);border:1px solid var(--border);border-radius:10px;color:var(--text)}.search-links a:hover{border-color:var(--border-strong)}.page-overlay{position:fixed;inset:0;z-index:100;background:rgba(0,0,0,.62);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .18s ease}.page-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-bottom{display:none}.split-feature{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}.quote-block{padding:18px;background:var(--panel-2);border:1px solid var(--border);border-radius:12px;color:var(--sand)}.mini-kicker{font-size:12px;color:var(--green-light);letter-spacing:.06em}.brand-panel{background:linear-gradient(160deg,#141A16,#0C100E);border:1px solid var(--border-strong);border-radius:14px;padding:22px}.brand-panel p{color:var(--muted)}
@media (max-width:860px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}.number-list{grid-template-columns:repeat(2,1fr)}.footer-brand{grid-template-columns:1fr}.footer-groups{grid-template-columns:repeat(2,1fr)}.split-feature{grid-template-columns:1fr}}
@media (max-width:680px){:root{--tabs-h:0px}.subtabs{display:none}.topline-inner,.sitebar-inner,.site-main,.footer-inner{width:calc(100% - 32px)}.sitebar-inner{grid-template-columns:minmax(80px,1fr) auto minmax(80px,1fr);gap:6px}.brand-logo{max-width:100px}.menu-button,.app-link{padding:0 10px;min-height:44px}.app-link{font-size:13px}.site-main{padding-top:calc(var(--top-h) + var(--bar-h) + 22px);padding-bottom:82px}.page-head{padding-top:18px}.hero-media{height:260px}.grid-3,.grid-2,.grid-4{grid-template-columns:1fr}.number-list{grid-template-columns:1fr 1fr}.section-head{align-items:start;flex-direction:column}.search-panel{inset:0;top:0;background:#080A09}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;padding:calc(22px + env(safe-area-inset-top)) 16px 80px;overflow:auto}.search-links{display:grid}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:75;height:calc(48px + env(safe-area-inset-bottom));display:grid;grid-template-columns:repeat(5,1fr);background:#050706;border-top:1px solid var(--border-strong);padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-width:0;font-size:12px;color:var(--text)}.mobile-bottom a.is-active{background:var(--green);color:#08110C;font-weight:800}.site-footer{padding-bottom:calc(80px + env(safe-area-inset-bottom))}.definition-list div{grid-template-columns:1fr;gap:6px}.drawer{z-index:120}.page-overlay{z-index:115}.footer-groups{grid-template-columns:1fr 1fr}}
@media (max-width:420px){.number-list{grid-template-columns:1fr}.footer-groups{grid-template-columns:1fr}.brand-logo{max-width:86px}.sitebar-inner{grid-template-columns:1fr auto 1fr}.menu-button{padding:0 9px}.app-link{padding:0 8px}}