:root{--bg:#0C100E;--deep:#080A09;--surface:#141A16;--surface2:#1A2420;--title:#E8F6EE;--text:#CDE3D6;--muted:#8FB3A0;--soft:#6E8F7E;--green:#2A9D5C;--bright:#3CB371;--darkgreen:#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}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}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}a{color:inherit;text-decoration:none}button,input{font:inherit}.skip-link{position:fixed;left:16px;top:-60px;z-index:1000;background:var(--bright);color:#08110C;padding:10px 14px;border-radius:8px}.skip-link:focus{top:8px}.site-shell{position:fixed;top:0;left:0;right:0;z-index:50}.eyebrow-bar{height:22px;background:#050706;color:var(--bright);font-size:12px;border-bottom:1px solid var(--border)}.bar-inner{max-width:var(--max);height:100%;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.text-button,.drawer-trigger,.icon-button{border:0;background:transparent;color:inherit;cursor:pointer}.text-button{min-height:22px;padding:0 4px;color:var(--bright)}.main-bar{height:60px;background:var(--deep);border-bottom:1px solid var(--border-strong)}.main-bar-inner{display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.brand-link{justify-self:start;display:inline-flex;align-items:center;min-height:44px}.brand-logo,.footer-logo{height:28px;max-width:170px;object-fit:contain;object-position:center}.brand-fallback{font-size:16px;font-weight:800;color:var(--title);letter-spacing:.04em}.drawer-trigger{justify-self:center;min-width:64px;min-height:44px;padding:0 14px;border:1px solid var(--border-strong);border-radius:10px;color:var(--text);background:#0b110e}.app-link{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-size:14px;font-weight:800}.section-tabs{height:40px;background:#0f2118;border-bottom:1px solid var(--border-strong)}.tabs-inner{max-width:var(--max);height:100%;margin:0 auto;display:flex;align-items:center;justify-content:center;gap:8px;padding:0 20px}.tabs-inner a{height:32px;display:inline-flex;align-items:center;padding:0 15px;border-radius:8px;color:var(--text);font-size:13px}.tabs-inner a.is-current{background:var(--green);color:#08110C;font-weight:800}.page-main{max-width:var(--max);margin:0 auto;padding:146px 20px 64px}.page-hero{padding:26px 0 20px}.kicker{font-size:12px;color:var(--bright);letter-spacing:.12em;text-transform:uppercase}.page-hero h1{margin:6px 0 10px;color:var(--title);font-size:24px;line-height:1.3}.page-hero p{max-width:850px;margin:0;color:var(--muted)}h2{font-size:20px;line-height:1.35;color:var(--title);margin:0 0 10px}h3{font-size:16px;line-height:1.4;color:var(--sand);margin:0 0 8px}p{margin:0 0 12px}.section{padding:24px 0;border-top:1px solid var(--border)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}.section-head p{margin:0;color:var(--muted);max-width:650px}.grid-2,.grid-3,.grid-4{display:grid;gap:14px}.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(--surface);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow)}.card p:last-child{margin-bottom:0}.card .meta{font-size:12px;color:var(--soft);margin-bottom:6px}.media-slot{width:100%;height:180px;background:var(--deep);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-bottom:14px}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.media-slot.banner{height:260px}.media-slot.wide{height:200px}.media-slot.app-visual{height:min(360px,60vw)}.cover-copy{text-align:center;max-width:840px;margin:0 auto}.cover-copy .brandline{font-size:13px;color:var(--bright);letter-spacing:.12em}.cover-copy h1{font-size:24px;line-height:1.3;margin:8px 0 10px;color:var(--title)}.actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:16px}.btn{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 17px;border-radius:10px;font-size:14px;font-weight:800;white-space:nowrap}.btn-primary{background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C}.btn-secondary{background:#0a0e0c;border:1px solid var(--border-strong);color:var(--text)}a:hover,.text-button:hover,.drawer-trigger:hover,.icon-button:hover{filter:brightness(1.08)}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--bright);outline-offset:3px}.number-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:14px 0}.number-list div{padding:12px;border:1px solid var(--border);border-radius:10px;background:var(--surface2)}.number-list strong{display:block;color:var(--bright);font-size:12px}.lesson-list,.article-list,.sound-list{display:grid;gap:10px}.lesson-list article,.article-list article,.sound-list article{padding:14px 15px;background:var(--surface);border-left:3px solid var(--green);border-radius:0 10px 10px 0}.timeline{position:relative;margin:8px 0 0;padding-left:24px}.timeline:before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:1px;background:var(--border-strong)}.timeline-item{position:relative;padding:0 0 20px 10px}.timeline-item:before{content:"";position:absolute;left:-21px;top:7px;width:9px;height:9px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px #0C100E}.status{display:inline-flex;min-height:28px;align-items:center;padding:0 9px;border-radius:999px;background:#d9f1e3;color:#0b2114;font-size:12px;font-weight:800;margin-bottom:6px}.notice{padding:16px 18px;border:1px solid var(--border-strong);background:#0d1712;border-radius:12px;color:var(--text)}.prose{max-width:900px}.prose p{color:var(--text)}.term-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.term-grid dl{margin:0;padding:15px;background:var(--surface);border:1px solid var(--border);border-radius:10px}.term-grid dt{font-weight:800;color:var(--sand);margin-bottom:6px}.term-grid dd{margin:0;color:var(--muted)}.faq-list{display:grid;gap:12px}.faq-item{padding:18px;background:var(--surface);border:1px solid var(--border);border-radius:12px}.faq-item h2{font-size:16px;margin-bottom:8px}.faq-item p{margin:0}.site-footer{background:#050706;border-top:1px solid var(--border-strong);color:var(--text);font-size:13px;padding:34px 20px calc(34px + env(safe-area-inset-bottom))}.footer-inner{max-width:var(--max);margin:0 auto}.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:20px}.footer-brand span{color:var(--muted);letter-spacing:.12em}.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.footer-grid h2{font-size:13px;color:var(--bright);margin:0 0 8px}.footer-grid a{display:block;color:var(--text);padding:3px 0}.rights-note{margin:24px 0 8px;color:var(--muted);max-width:860px}.copyright{margin:0;color:var(--soft)}.drawer{position:fixed;z-index:80;left:0;top:0;bottom:0;width:400px;max-width:86vw;background:#090d0b;color:var(--text);transform:translateX(-105%);transition:transform .22s ease;visibility:hidden;pointer-events:none;overflow:auto;box-shadow:20px 0 50px rgba(0,0,0,.35)}.drawer.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:12px;padding:16px;background:#090d0b;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-brand img{height:28px;max-width:150px;object-fit:contain}.drawer-brand span{display:grid}.drawer-brand small{font-size:11px;color:var(--muted)}.icon-button{min-height:44px;padding:0 10px;border:1px solid var(--border);border-radius:9px;color:var(--text)}.drawer-body{padding:12px 16px 30px}.drawer-body section{padding:10px 0;border-bottom:1px solid var(--border)}.drawer-body h2{font-size:12px;color:var(--bright);margin-bottom:5px}.drawer-body a{display:grid;gap:2px;padding:10px 8px;border-radius:8px}.drawer-body a:hover{background:var(--surface2)}.drawer-body strong{font-size:14px;color:var(--title)}.drawer-body span{font-size:12px;color:var(--muted)}.site-overlay{position:fixed;z-index:70;inset:0;background:rgba(0,0,0,.62);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease}.site-overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}.search-layer{position:fixed;z-index:85;top:82px;left:50%;width:min(720px,calc(100% - 32px));transform:translate(-50%,-20px);opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}.search-layer.is-open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}.search-card{background:#070a08;border:1px solid var(--border-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:12px}.search-card label{display:block;color:var(--muted);margin-bottom:8px}.search-card input{width:100%;height:44px;border:1px solid var(--border-strong);border-radius:10px;background:#101713;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:1px solid var(--border);border-radius:9px;background:var(--surface);color:var(--text)}.ui-locked{overflow:hidden}.mobile-dock{display:none}.split-feature{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:16px;align-items:start}.app-copy .icon-row{display:flex;align-items:center;gap:12px;margin-bottom:12px}.app-copy .app-icon-slot{width:48px;height:48px;background:var(--deep);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center}.app-copy .app-icon-slot img{width:48px;height:48px;object-fit:contain}.tagrow{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0}.tag{display:inline-flex;min-height:28px;align-items:center;padding:0 9px;border:1px solid var(--border);border-radius:999px;color:var(--muted);font-size:12px}
@media (max-width:820px){.bar-inner{padding:0 16px}.section-tabs{display:none}.page-main{padding:98px 16px 76px}.grid-3,.grid-4{grid-template-columns:1fr}.grid-2,.term-grid,.split-feature{grid-template-columns:1fr}.number-list{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mobile-dock{position:fixed;z-index:55;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:#050706;border-top:1px solid var(--border-strong)}.mobile-dock a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:12px;color:var(--text)}.mobile-dock a.is-current{background:var(--green);color:#08110C;font-weight:800}.site-footer{padding-bottom:calc(82px + env(safe-area-inset-bottom))}.search-layer{top:0;left:0;width:100%;height:100%;transform:none;background:#050706}.search-layer.is-open{transform:none}.search-card{min-height:100%;border:0;border-radius:0;padding:22px 16px}.media-slot.banner{height:260px}.main-bar-inner{grid-template-columns:1fr auto 1fr}.brand-logo{max-width:120px}.app-link{padding:0 11px}.drawer-trigger{min-width:58px;padding:0 10px}}
@media (max-width:480px){.footer-grid{grid-template-columns:1fr 1fr}.number-list{grid-template-columns:1fr 1fr}.page-hero{padding-top:20px}.card{padding:16px}.bar-inner{gap:8px}.app-link{font-size:13px}.brand-fallback{font-size:15px}}