:root{
    --bg:#0C100E;--deep:#080A09;--card:#141A16;--card2:#1A2420;--title:#E8F6EE;--text:#CDE3D6;--muted:#8FB3A0;--assist:#6E8F7E;--green:#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;--topline:22px;--utility:60px;--tabs:40px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg);overflow-x:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Noto Sans CJK SC",Arial,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%}
.skip-link{position:fixed;left:16px;top:-80px;z-index:1000;background:var(--sand);color:var(--deep);padding:8px 12px;border-radius:8px}.skip-link:focus{top:10px}
.topline{position:fixed;z-index:80;top:0;left:0;right:0;height:var(--topline);background:#050706;color:var(--bright);border-bottom:1px solid var(--line)}
.topline-inner{max-width:var(--max);height:100%;margin:auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;font-size:12px;line-height:1}
.topline-search{position:relative;height:22px;min-width:44px;border:0;background:transparent;color:var(--bright);cursor:pointer;padding:0 8px}.topline-search:before{content:"";position:absolute;left:-4px;right:-4px;top:-11px;bottom:-11px}
.utilitybar{position:fixed;z-index:79;top:var(--topline);left:0;right:0;height:var(--utility);background:#080A09;border-bottom:1px solid var(--line-strong)}
.utilitybar-inner{max-width:var(--max);height:100%;margin:auto;padding:0 20px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px}
.brand-link{justify-self:start;display:inline-flex;align-items:center;min-width:80px;height:44px}.brand-logo{height:28px;width:auto;object-fit:contain;object-position:center}.brand-text{font-size:16px;font-weight:800;color:var(--title);letter-spacing:.04em}
.drawer-open,.app-link,.drawer-close,.search-head button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:10px;border:1px solid var(--line-strong);background:var(--deep);color:var(--text);padding:0 16px;cursor:pointer}
.drawer-open{justify-self:center}.app-link{justify-self:end;background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;border:0;font-weight:800}
.layer-tabs{position:fixed;z-index:78;top:calc(var(--topline) + var(--utility));left:0;right:0;height:var(--tabs);background:var(--darkgreen);border-bottom:1px solid var(--line-strong)}
.layer-tabs-inner{max-width:var(--max);height:100%;margin:auto;display:flex;align-items:center;justify-content:center;gap:10px;padding:0 20px}
.layer-tabs a{height:30px;min-width:96px;padding:0 16px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-size:13px;color:var(--title)}
.layer-tabs a.is-current{background:var(--green);color:#08110C;font-weight:800}
.site-main{min-height:60vh;padding-top:calc(var(--topline) + var(--utility) + var(--tabs) + 26px);padding-bottom:44px}
.container{width:min(calc(100% - 40px),var(--max));margin:0 auto}
.page-head{padding:24px 0 20px;border-bottom:1px solid var(--line);margin-bottom:28px}.eyebrow{margin:0 0 7px;color:var(--bright);font-size:12px;letter-spacing:.08em;text-transform:uppercase}.page-head h1,.hero-copy h1{margin:0;color:var(--title);font-size:24px;line-height:1.3}.page-head p{max-width:820px;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:1.45;color:var(--sand);margin:0 0 8px}p{margin:0 0 14px}.muted{color:var(--muted)}
.hero{padding-top:2px}.hero-banner{height:260px;width:100%;background:var(--deep);border:1px solid var(--line);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden;box-shadow:var(--shadow)}.hero-banner img,.image-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.hero-copy{padding:24px 0 6px}.hero-copy .brand-kicker{color:var(--bright);font-size:13px;margin-bottom:8px}.hero-copy p{max-width:840px;color:var(--text)}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn{min-height:44px;padding:0 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;white-space:nowrap}.btn-primary{background:linear-gradient(135deg,#3CB371 0%,#2A9D5C 55%,#146B3A 100%);color:#08110C;font-weight:800}.btn-secondary{background:var(--deep);border:1px solid var(--line-strong);color:var(--text)}
.section{padding:30px 0;border-top:1px solid var(--line)}.section:first-of-type{border-top:0}.section-title{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:16px}.section-title p{margin:0;max-width:640px;color:var(--muted)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:0 8px 18px rgba(8,10,9,.18);min-width:0}.card p{color:var(--text)}.card a.more{display:inline-flex;min-height:44px;align-items:center;color:var(--bright);font-weight:700}.card .tag{display:inline-flex;align-items:center;min-height:26px;padding:0 9px;border-radius:999px;background:var(--card2);color:var(--muted);font-size:12px;margin-bottom:10px}
.image-slot{width:100%;height:180px;background:var(--deep);border:1px solid var(--line);border-radius:10px;margin-bottom:14px;display:flex;align-items:center;justify-content:center;overflow:hidden}.image-slot.medium{height:200px}.image-slot.app-visual{height:360px;max-width:420px;margin:0 auto 18px}.image-slot.icon-slot{height:68px;width:68px;border-radius:16px}.image-slot.icon-slot img{width:48px;height:48px}
.feature-row{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:20px;align-items:stretch}.feature-copy{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}.number-list{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0}.number-list span{background:var(--card2);border:1px solid var(--line);border-radius:10px;padding:12px;color:var(--sand);text-align:center;font-size:13px}.number-list b{display:block;color:var(--bright);font-size:18px;margin-bottom:4px}
.lesson-list,.entry-list,.link-index{display:grid;gap:12px}.lesson-item,.entry-item,.index-item{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}.lesson-item strong,.entry-item strong,.index-item strong{color:var(--sand)}.lesson-item p,.entry-item p,.index-item p{margin:6px 0 0;color:var(--muted)}
.timeline{position:relative;margin:6px 0 0;padding-left:28px}.timeline:before{content:"";position:absolute;left:8px;top:8px;bottom:8px;width:1px;background:var(--line-strong)}.timeline-item{position:relative;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:14px}.timeline-item:before{content:"";position:absolute;left:-25px;top:22px;width:9px;height:9px;border-radius:50%;background:var(--bright);box-shadow:0 0 0 4px var(--bg)}.status{display:inline-flex;min-height:26px;align-items:center;padding:0 9px;border-radius:999px;background:var(--green);color:#08110C;font-size:12px;font-weight:800;margin-bottom:8px}
.prose{max-width:900px}.prose h2{margin-top:28px}.prose h2:first-child{margin-top:0}.prose p{color:var(--text)}.prose ul{padding-left:1.2em;color:var(--text)}.prose li{margin:.35em 0}.notice{background:var(--card2);border:1px solid var(--line-strong);border-radius:12px;padding:16px;color:var(--text);margin:18px 0}.notice strong{color:var(--sand)}
.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:0 0 8px;color:var(--sand)}.faq-item p{margin:0;color:var(--text)}
.site-footer{background:#050706;border-top:1px solid var(--line-strong);color:var(--text);padding:34px 0 calc(28px + env(safe-area-inset-bottom))}.footer-inner{width:min(calc(100% - 40px),var(--max));margin:auto}.footer-brand{display:flex;align-items:center;gap:14px;margin-bottom:24px}.footer-brand-link{display:inline-flex;align-items:center;height:44px}.footer-logo{height:28px;width:auto;object-fit:contain}.footer-brand p{margin:0;display:flex;gap:9px;align-items:baseline}.footer-brand-name,.footer-brand strong{color:var(--title);font-size:16px}.footer-brand span{color:var(--muted);font-size:13px}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.footer-groups h2{font-size:13px;color:var(--bright);margin:0 0 9px}.footer-groups a{display:block;font-size:13px;color:var(--text);padding:4px 0}.footer-note,.footer-copy{font-size:13px;color:var(--muted);max-width:940px}.footer-note{margin:18px 0 8px}.footer-copy{margin:0}
.site-overlay{position:fixed;inset:0;z-index:88;background:rgba(0,0,0,.62);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,visibility .2s ease}.drawer-active .site-overlay,.search-active .site-overlay{opacity:1;visibility:visible;pointer-events:auto}
.site-drawer{position:fixed;z-index:92;left:0;top:0;bottom:0;width:400px;max-width:86vw;background:var(--deep);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 ease}.drawer-active .site-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:72px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 18px;border-bottom:1px solid var(--line)}.drawer-brand{display:flex;align-items:center;gap:10px;color:var(--title)}.drawer-logo{height:28px;width:auto;object-fit:contain}.drawer-scroll{height:calc(100% - 72px);overflow-y:auto;padding:16px 18px 28px}.drawer-group{margin-bottom:18px}.drawer-group h2{font-size:13px;color:var(--bright);margin:0 0 8px}.drawer-group a{display:block;border-top:1px solid var(--line);padding:11px 0}.drawer-group b{display:block;color:var(--sand);font-size:15px}.drawer-group span{display:block;color:var(--muted);font-size:13px;margin-top:2px}.panel-lock{overflow:hidden}
.search-panel{position:fixed;z-index:93;top:calc(var(--topline) + var(--utility));left:50%;width:min(calc(100% - 40px),760px);transform:translate(-50%,-14px);background:var(--deep);border:1px solid var(--line-strong);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,transform .2s ease,visibility .2s ease}.search-active .search-panel{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}.search-card{padding:18px}.search-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.search-head strong{color:var(--title);font-size:18px}.search-card>p{color:var(--muted);margin:4px 0 14px}.search-presets{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.search-presets a{min-height:44px;display:flex;align-items:center;justify-content:center;border-radius:10px;background:var(--card);border:1px solid var(--line);color:var(--text)}
.mobile-bottom{display:none}
a:hover,.footer-groups a:hover,.drawer-group a:hover{color:var(--bright)}a:focus-visible,button:focus-visible{outline:2px solid var(--sand);outline-offset:2px}
@media (max-width:820px){
    :root{--tabs:0px}.layer-tabs{display:none}.topline-inner,.utilitybar-inner{padding:0 16px}.utilitybar-inner{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:8px}.brand-link{min-width:0}.brand-logo{max-width:112px}.drawer-open,.app-link{padding:0 12px}.site-main{padding-top:calc(var(--topline) + var(--utility) + 18px);padding-bottom:76px}.container{width:calc(100% - 32px)}.page-head{padding-top:18px}.card-grid,.card-grid.two,.card-grid.four,.feature-row{grid-template-columns:1fr}.number-list{grid-template-columns:repeat(2,1fr)}.footer-inner{width:calc(100% - 32px)}.footer-groups{grid-template-columns:repeat(2,1fr)}.site-footer{padding-bottom:calc(82px + env(safe-area-inset-bottom))}.mobile-bottom{position:fixed;z-index:70;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(--line-strong)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-width:0;min-height:48px;font-size:13px;color:var(--muted)}.mobile-bottom a.is-current{background:var(--green);color:#08110C;font-weight:800}.search-panel{top:0;left:0;right:0;bottom:0;width:100%;border:0;border-radius:0;transform:none;background:var(--deep)}.search-active .search-panel{transform:none}.search-card{padding:calc(28px + env(safe-area-inset-top)) 16px 24px}.search-presets{grid-template-columns:1fr}.search-presets a{justify-content:flex-start;padding:0 14px}.site-drawer{max-width:86vw}.hero-banner{height:260px}.section-title{display:block}.section-title p{margin-top:6px}.image-slot.app-visual{height:320px}
}
@media (max-width:480px){.topline-inner{padding:0 12px}.utilitybar-inner{padding:0 12px}.brand-text{font-size:15px}.drawer-open,.app-link{font-size:13px;padding:0 10px}.footer-groups{grid-template-columns:1fr 1fr;gap:16px}.hero-copy h1,.page-head h1{font-size:24px}.card{padding:16px}.number-list{grid-template-columns:1fr 1fr}}