*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:#0b0c0f;color:#e5e7eb;line-height:1.65}
a{color:#93c5fd;text-decoration:none}
a:hover{color:#bfdbfe}
code{background:rgba(255,255,255,.06);padding:1px 6px;border-radius:4px;font-family:'SF Mono',Consolas,monospace;font-size:.92em}
.container{max-width:880px;margin:0 auto;padding:0 24px}
.narrow{max-width:760px}

/* Nav */
nav.topnav{border-bottom:1px solid rgba(255,255,255,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:1100px;margin:0 auto}
.nav-logo{font-size:17px;font-weight:700;color:#fff}
.nav-links{display:flex;gap:24px;align-items:center}
.nav-links a{font-size:14px;color:#9ca3af}
.nav-links a.active,.nav-links a:hover{color:#fff}
.nav-cta{padding:6px 14px;background:#2563eb;color:#fff!important;border-radius:6px;font-weight:500}
.nav-cta:hover{background:#1d4ed8}

/* Hero */
.hero{padding:80px 0 40px;text-align:center}
h1{font-size:clamp(32px,5vw,52px);font-weight:700;letter-spacing:-.02em;margin-bottom:16px;color:#fff}
.tagline{font-size:17px;color:#9ca3af;max-width:600px;margin:0 auto 32px}
.cta-group{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:10px 20px;border-radius:6px;font-weight:500;font-size:14px;border:1px solid transparent}
.btn-primary{background:#2563eb;color:#fff}
.btn-primary:hover{background:#1d4ed8}
.btn-secondary{background:transparent;color:#e5e7eb;border-color:rgba(255,255,255,.15)}
.btn-secondary:hover{border-color:rgba(255,255,255,.3)}

/* Sections */
section{padding:48px 0}
section h2{font-size:24px;font-weight:600;margin-bottom:12px;color:#fff}
.muted{color:#9ca3af;margin-bottom:20px;font-size:15px}

/* Page (about) */
.page{padding:60px 0}
.page h1{font-size:32px;text-align:left;margin-bottom:20px}
.page h2{font-size:20px;margin-top:36px;margin-bottom:12px}
.page p{color:#cbd5e1;margin-bottom:14px}
.page ul{margin-left:22px;color:#cbd5e1;margin-bottom:14px}
.page li{margin-bottom:6px}

/* Code */
.code-block{background:#13151a;border:1px solid rgba(255,255,255,.08);border-radius:8px;padding:18px 20px;font-family:'SF Mono',Consolas,monospace;font-size:13px;color:#cbd5e1;overflow-x:auto;line-height:1.7;white-space:pre}
.code-block .key{color:#f59e0b}
.code-block .str{color:#86efac}
.code-block .var{color:#93c5fd}
.code-block .com{color:#6b7280;font-style:italic}

/* URL callout */
.url-callout{background:linear-gradient(135deg,rgba(37,99,235,.08),rgba(59,130,246,.04));border:1px solid rgba(59,130,246,.25);border-radius:12px;padding:24px 28px;margin-bottom:40px;text-align:center}
.url-callout-label{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:#60a5fa;margin-bottom:14px;font-weight:600}
.url-display{font-family:'SF Mono',Consolas,monospace;font-size:clamp(20px,3.4vw,30px);font-weight:600;letter-spacing:-.01em;line-height:1.3}
.url-scheme{color:#6b7280}
.url-host{color:#e5e7eb}
.url-api{color:#60a5fa;position:relative;padding:0 2px;border-radius:4px;animation:apiPulse 2.4s ease-in-out infinite}
.url-api::before{content:'';position:absolute;inset:-2px -4px;border-radius:6px;background:rgba(96,165,250,.18);z-index:-1;animation:apiGlow 2.4s ease-in-out infinite}
@keyframes apiPulse{0%,100%{color:#60a5fa;text-shadow:0 0 0 rgba(96,165,250,0)}50%{color:#93c5fd;text-shadow:0 0 14px rgba(96,165,250,.6)}}
@keyframes apiGlow{0%,100%{opacity:.3;transform:scale(1)}50%{opacity:.7;transform:scale(1.08)}}
.url-note{margin-top:14px;font-size:13px;color:#9ca3af}
.url-note code.hl{background:rgba(96,165,250,.15);color:#93c5fd;padding:1px 6px;border-radius:4px;font-weight:500}
.url-note code.dim{background:rgba(255,255,255,.04);color:#6b7280;text-decoration:line-through;padding:1px 6px;border-radius:4px}

/* Tabs */
.tabs{display:flex;gap:4px;border-bottom:1px solid rgba(255,255,255,.08);margin:24px 0 0;flex-wrap:wrap}
.tab{background:transparent;border:none;color:#9ca3af;padding:10px 16px;font-size:14px;font-weight:500;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px;transition:color .15s,border-color .15s;font-family:inherit}
.tab:hover{color:#e5e7eb}
.tab.active{color:#fff;border-bottom-color:#2563eb}
.tab-panel{display:none;animation:fadeIn .25s ease}
.tab-panel.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}

/* Doc layout */
.doc-layout{display:grid;grid-template-columns:220px 1fr;gap:48px;padding:48px 24px;max-width:1100px;margin:0 auto}
.doc-sidebar{position:sticky;top:24px;height:fit-content}
.doc-sidebar h4{font-size:12px;text-transform:uppercase;color:#6b7280;letter-spacing:.08em;margin-bottom:10px;margin-top:20px}
.doc-sidebar h4:first-child{margin-top:0}
.doc-sidebar a{display:block;padding:5px 0;font-size:14px;color:#9ca3af}
.doc-sidebar a:hover,.doc-sidebar a.active{color:#fff}
.doc-content h2{font-size:24px;margin-bottom:18px;margin-top:40px;color:#fff;font-weight:600}
.doc-content h2:first-child{margin-top:0}
.doc-content h3{font-size:17px;margin-top:24px;margin-bottom:10px;color:#e5e7eb;font-weight:600}
.doc-content p{margin-bottom:12px;color:#cbd5e1}
.doc-content ul,.doc-content ol{margin-left:22px;margin-bottom:14px;color:#cbd5e1}
.doc-content li{margin-bottom:5px}
.doc-content table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.doc-content th{background:rgba(255,255,255,.04);padding:10px;text-align:left;color:#e5e7eb;font-weight:600;border-bottom:1px solid rgba(255,255,255,.08)}
.doc-content td{padding:10px;border-bottom:1px solid rgba(255,255,255,.05);color:#cbd5e1}
@media(max-width:768px){.doc-layout{grid-template-columns:1fr;gap:24px}.doc-sidebar{position:relative;top:0}}

/* Footer */
footer{padding:32px 0;border-top:1px solid rgba(255,255,255,.08);text-align:center;color:#6b7280;font-size:13px;margin-top:60px}
footer a{margin:0 10px;color:#9ca3af}
footer a:hover{color:#e5e7eb}

@media(max-width:640px){
  .nav-links{gap:14px}
  .nav-links a:not(.nav-cta){font-size:13px}
  .hero{padding:50px 0 30px}
  section{padding:36px 0}
}