:root{
  --bg:#0C100E;--bg-deep:#080A09;--panel:#141A16;--panel2:#1A2420;
  --title:#E8F6EE;--text:#CDE3D6;--muted:#8FB3A0;--faint:#6E8F7E;
  --green:#2A9D5C;--green2:#3CB371;--green3:#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;--topline:22px;--utility:60px;--subtabs:40px;--mobilebar:48px;
}
*{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","Hiragino Sans GB","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}.topline,.utility-bar{position:fixed;left:0;right:0;z-index:80}.topline{top:0;height:var(--topline);background:var(--bg-deep);color:var(--green2);font-size:12px;border-bottom:1px solid var(--line)}.topline-inner,.utility-inner{max-width:var(--max);height:100%;margin:0 auto;padding:0 18px;display:flex;align-items:center;justify-content:space-between}.text-button,.drawer-open,.drawer-close,.search-close{border:0;background:transparent;color:inherit;cursor:pointer}.text-button{height:22px;padding:0 8px;color:var(--green2)}.utility-bar{top:var(--topline);height:var(--utility);background:#090C0A;border-bottom:1px solid var(--line-strong)}.utility-inner{position:relative}.brand-link,.footer-brand-link,.drawer-brand{display:flex;align-items:center;gap:10px}.brand-link{min-width:132px}.logo-box,.footer-logo-box,.drawer-logo-box{height:28px;min-width:28px;display:flex;align-items:center;justify-content:flex-start}.brand-logo,.footer-logo,.drawer-logo{display:block;max-height:28px;max-width:150px;object-fit:contain;object-position:center}.brand-fallback{font-weight:700;font-size:16px;color:var(--title)}.drawer-open{position:absolute;left:50%;transform:translateX(-50%);height:44px;min-width:82px;padding:0 18px;border:1px solid var(--line-strong);border-radius:10px;color:var(--text);background:#0D120F}.app-link{height:44px;display:inline-flex;align-items:center;padding:0 15px;border-radius:10px;background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;font-weight:700;font-size:14px}.subtabs{position:fixed;z-index:70;top:calc(var(--topline) + var(--utility));left:0;right:0;height:var(--subtabs);display:flex;align-items:stretch;justify-content:center;background:#0E2B1C;border-bottom:1px solid var(--line-strong)}.subtabs a{min-width:120px;padding:0 18px;display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--text);border-left:1px solid rgba(255,255,255,.03)}.subtabs a:last-child{border-right:1px solid rgba(255,255,255,.03)}.subtabs a.is-active{background:var(--green);color:#08110C;font-weight:800}.site-main{max-width:var(--max);margin:0 auto;padding:calc(var(--topline) + var(--utility) + var(--subtabs) + 28px) 18px 72px}.page-hero{margin:0 0 28px;padding:24px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(180deg,#111713,#0F1511);box-shadow:var(--shadow)}.eyebrow{margin:0 0 8px;color:var(--green2);font-size:12px;letter-spacing:.08em}.page-hero h1{margin:0;color:var(--title);font-size:24px;line-height:1.3}.lead{margin:12px 0 0;color:var(--text);max-width:860px}.section{margin:26px 0}.section h2{margin:0 0 12px;color:var(--title);font-size:20px}.section h3{margin:0 0 8px;color:var(--title);font-size:16px}.section p{margin:0 0 12px}.cards{display:grid;gap:16px}.cards.three{grid-template-columns:repeat(3,minmax(0,1fr))}.cards.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{min-width:0;padding:18px;border:1px solid var(--line);border-radius:12px;background:var(--panel);box-shadow:var(--shadow)}.card p{margin:0;color:var(--text)}.card small,.muted{color:var(--muted)}.image-slot{width:100%;min-height:140px;display:flex;align-items:center;justify-content:center;background:var(--bg-deep);border:1px solid var(--line);border-radius:12px;overflow:hidden}.image-slot.home-banner{height:260px}.image-slot.card-image{height:180px;margin-bottom:14px}.image-slot.section-image{height:200px;margin-bottom:16px}.image-slot.app-image{height:360px;max-width:460px;margin:0 auto 16px}.image-slot img{display:block;width:100%;height:100%;object-fit:contain;object-position:center}.cover-copy{padding:18px 4px 0}.cover-copy h1{margin:0;font-size:24px;line-height:1.3;color:var(--title)}.cover-copy .tagline{font-size:20px;margin:8px 0;color:var(--sand)}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.btn{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border-radius:10px;font-size:14px;font-weight:700}.btn-primary{background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C}.btn-secondary{border:1px solid var(--line-strong);background:#0B100D;color:var(--text)}.btn:hover,.app-link:hover,.drawer-open:hover{filter:brightness(1.08)}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--sand);outline-offset:2px}.numbered{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:14px}.numbered span{display:flex;align-items:center;justify-content:center;min-height:44px;border-radius:10px;background:var(--panel2);border:1px solid var(--line);color:var(--text);font-weight:700}.lesson-list,.column-list,.link-index{display:grid;gap:10px}.lesson-list li,.timeline li,.column-list li{list-style:none}.lesson-list{grid-template-columns:repeat(2,minmax(0,1fr));padding:0;margin:0}.lesson-list li{padding:14px;border:1px solid var(--line);border-radius:10px;background:var(--panel2)}.timeline{position:relative;padding:0 0 0 24px;margin:0}.timeline:before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:1px;background:var(--line-strong)}.timeline li{position:relative;margin:0 0 14px;padding:15px 16px;border:1px solid var(--line);border-radius:10px;background:var(--panel)}.timeline li:before{content:"";position:absolute;left:-22px;top:23px;width:9px;height:9px;border-radius:50%;background:var(--green2);box-shadow:0 0 0 4px #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}.info-table{width:100%;border-collapse:collapse;border:1px solid var(--line);background:var(--panel);border-radius:12px;overflow:hidden}.info-table th,.info-table td{padding:12px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}.info-table th{width:28%;color:var(--sand);background:#101612}.info-table tr:last-child th,.info-table tr:last-child td{border-bottom:0}.quote-box{padding:16px 18px;border-left:3px solid var(--green2);background:var(--panel2);border-radius:0 10px 10px 0;color:var(--text)}.faq-list{display:grid;gap:12px}.faq-item{padding:17px 18px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.faq-item h2{margin:0 0 8px;font-size:16px;color:var(--title)}.faq-item p{margin:0}.site-footer{background:#050706;border-top:1px solid var(--line-strong);color:var(--text);font-size:13px}.footer-inner{max-width:var(--max);margin:0 auto;padding:28px 18px 82px}.footer-brand{margin-bottom:18px}.footer-brand-link strong,.drawer-brand strong{display:block;font-size:16px;color:var(--title)}.footer-brand-link small,.drawer-brand small{display:block;color:var(--muted)}.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.footer-grid h2{font-size:13px;margin:0 0 8px;color:var(--green2)}.footer-grid a{display:block;padding:4px 0;color:var(--text)}.footer-grid a:hover{color:var(--sand)}.footer-note{max-width:900px;margin:22px 0 10px;color:var(--muted)}.copyright{margin:0;color:var(--faint)}.screen-mask{position:fixed;inset:0;z-index:110;background:rgba(0,0,0,.62);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.screen-mask.is-visible{opacity:1;visibility:visible;pointer-events:auto}.nav-drawer{position:fixed;z-index:120;top:0;bottom:0;left:0;width:400px;max-width:86vw;background:#080B09;border-right:1px solid var(--line-strong);box-shadow:var(--shadow);transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:transform .24s ease,visibility .24s;overflow-y:auto}.nav-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;min-height:66px;padding:10px 14px;background:#080B09;border-bottom:1px solid var(--line)}.drawer-close,.search-close{min-height:44px;padding:0 12px;border:1px solid var(--line-strong);border-radius:10px}.drawer-groups{padding:12px 14px 28px}.drawer-groups section{margin-bottom:18px}.drawer-groups h2{margin:0 0 8px;font-size:13px;color:var(--green2)}.drawer-groups a{display:block;padding:10px 12px;border-radius:10px;border:1px solid transparent}.drawer-groups a:hover{border-color:var(--line);background:var(--panel)}.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}.search-panel{position:fixed;z-index:125;top:calc(var(--topline) + var(--utility));left:50%;width:min(720px,calc(100vw - 32px));transform:translate(-50%,-16px);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.search-panel.is-open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}.search-card{padding:18px;border:1px solid var(--line-strong);border-radius:14px;background:#080B09;box-shadow:var(--shadow)}.search-head{display:flex;align-items:center;justify-content:space-between}.search-head strong{font-size:16px;color:var(--title)}.search-card p{color:var(--muted)}.search-label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}.search-input{width:100%;height:44px;padding:0 13px;border:1px solid var(--line-strong);border-radius:10px;background:#101612;color:var(--text)}.search-presets{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:12px}.search-presets a{min-height:44px;display:flex;align-items:center;justify-content:center;border-radius:10px;border:1px solid var(--line);background:var(--panel);color:var(--text)}.search-empty{margin-bottom:0}.mobile-bottom{display:none}
@media (max-width:820px){
  :root{--subtabs:0px}.topline-inner,.utility-inner{padding:0 16px}.subtabs{display:none}.site-main{padding:calc(var(--topline) + var(--utility) + 20px) 16px calc(var(--mobilebar) + env(safe-area-inset-bottom) + 32px)}.cards.three,.cards.two,.footer-grid{grid-template-columns:1fr}.lesson-list,.numbered{grid-template-columns:1fr 1fr}.page-hero{padding:20px}.footer-inner{padding:26px 16px calc(var(--mobilebar) + env(safe-area-inset-bottom) + 34px)}.mobile-bottom{position:fixed;z-index:90;left:0;right:0;bottom:0;height:calc(var(--mobilebar) + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:#070A08;border-top:1px solid var(--line-strong)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-width:0;font-size:13px;color:var(--text)}.mobile-bottom a.is-active{background:var(--green);color:#08110C;font-weight:800}.nav-drawer{width:86vw}.search-panel{top:0;left:0;right:0;bottom:0;width:100%;transform:none;background:#080B09}.search-panel.is-open{transform:none}.search-card{height:100%;border:0;border-radius:0;padding:calc(var(--topline) + 20px) 16px 24px}.search-presets{grid-template-columns:1fr 1fr}.image-slot.home-banner{height:220px}.image-slot.app-image{height:320px}.brand-link{min-width:84px}.brand-fallback{font-size:15px}.app-link{padding:0 10px}.drawer-open{min-width:70px;padding:0 12px}}
@media (max-width:520px){.numbered,.lesson-list,.search-presets{grid-template-columns:1fr}.image-slot.home-banner{height:190px}.image-slot.card-image{height:160px}.image-slot.section-image{height:180px}.page-hero h1,.cover-copy h1{font-size:24px}.cover-copy .tagline{font-size:18px}.utility-inner{gap:8px}.app-link{font-size:13px}.info-table th,.info-table td{display:block;width:100%}.info-table th{border-bottom:0;padding-bottom:4px}.info-table td{padding-top:4px}}

.button-center{justify-content:center}.app-icon-slot{width:64px;height:64px;min-height:64px;flex:0 0 64px}