*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#07090F;--surface:#0D1220;--surface2:#111827;--border:rgba(255,255,255,.07);--border2:rgba(255,255,255,.12);--text:#F1F5F9;--text-sub:#94A3B8;--text-dim:#475569;--coral:#E8431F;--coral-dim:#C73615;--coral-soft:rgba(232,67,31,.08);--green:#22C55E;--sans:'Plus Jakarta Sans',system-ui,-apple-system,sans-serif;--radius:12px;--radius-sm:8px}
html,body{min-height:100vh;background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased;line-height:1.6}
a{color:var(--coral);text-decoration:none}
a:hover{text-decoration:underline}

/* Sidebar */
.sidebar{position:fixed;top:0;left:0;bottom:0;width:260px;background:var(--surface);border-right:1px solid var(--border);overflow-y:auto;padding:20px 0;z-index:100;transition:transform .25s}
.sidebar-header{padding:0 20px 20px;border-bottom:1px solid var(--border);margin-bottom:12px}
.sidebar-brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.sidebar-brand:hover{text-decoration:none}
.sidebar-logo{width:32px;height:32px;flex-shrink:0}
.sidebar-brand-text{font-size:16px;font-weight:700;color:var(--text);letter-spacing:-.02em}
.sidebar-brand-text .coral{color:var(--coral)}
.sidebar-brand-text .dim{color:var(--text-sub);font-weight:500}
.sidebar-section{margin-bottom:8px}
.sidebar-section-title{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);padding:12px 20px 4px}
.sidebar-link{display:block;padding:7px 20px;font-size:13px;color:var(--text-sub);text-decoration:none;transition:all .15s;border-left:2px solid transparent}
.sidebar-link:hover{color:var(--text);background:rgba(255,255,255,.03);text-decoration:none}
.sidebar-link.active{color:var(--text);background:var(--coral-soft);border-left-color:var(--coral)}
.sidebar-footer{padding:16px 20px;border-top:1px solid var(--border);margin-top:12px}
.sidebar-footer-link{font-size:12px;color:var(--text-sub);text-decoration:none}
.sidebar-footer-link:hover{color:var(--coral)}

/* Content */
.content{margin-left:260px;min-height:100vh}
.content-inner{max-width:780px;margin:0 auto;padding:48px 40px 80px}
.page-title{margin-bottom:40px}
.page-title h1{font-size:32px;font-weight:800;letter-spacing:-.03em;margin-bottom:8px}
.page-title .subtitle{font-size:16px;color:var(--text-sub);line-height:1.5}

.doc-section{margin-bottom:40px}
.doc-section h2{font-size:20px;font-weight:700;letter-spacing:-.02em;margin-bottom:16px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.doc-section h3{font-size:16px;font-weight:600;margin-bottom:12px;margin-top:24px}
.doc-section p{margin-bottom:14px;color:var(--text);line-height:1.7}
.doc-section ul,.doc-section ol{margin:12px 0 16px 20px;line-height:1.8}
.doc-section li{margin-bottom:6px}
.doc-section code{background:rgba(255,255,255,.06);padding:2px 6px;border-radius:4px;font-size:13px;color:var(--coral)}
.doc-section pre{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 20px;overflow-x:auto;margin:16px 0;font-size:13px;line-height:1.6}
.doc-section pre code{background:none;padding:0;color:var(--text)}

/* Feature grid */
.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}
.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:border-color .15s}
.feature-card:hover{border-color:rgba(255,255,255,.12)}
.feature-icon{font-size:24px;margin-bottom:10px}
.feature-title{font-size:14px;font-weight:700;margin-bottom:4px}
.feature-desc{font-size:13px;color:var(--text-sub);line-height:1.5}

/* Steps */
.steps{counter-reset:step}
.steps li{margin-bottom:14px;padding-left:4px}

/* Routing table */
.routing-table{display:flex;flex-direction:column;gap:8px;margin:16px 0}
.routing-row{display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px}
.routing-trigger{flex:1;color:var(--text);font-style:italic}
.routing-arrow{color:var(--text-dim);font-weight:700}
.routing-target{color:var(--coral);font-weight:700;min-width:40px}

/* Seat page */
.seat-header{display:flex;align-items:center;gap:16px;margin-bottom:32px;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.seat-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:28px;flex-shrink:0}
.seat-title{font-size:24px;font-weight:800;letter-spacing:-.02em}
.seat-subtitle{font-size:14px;color:var(--text-sub)}

.capability-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0}
.capability-list li{padding:10px 14px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13px;display:flex;align-items:center;gap:8px}
.capability-list li::before{content:'✓';color:var(--green);font-weight:700}

/* Callout */
.callout{padding:16px 20px;border-radius:var(--radius-sm);margin:16px 0;font-size:14px;line-height:1.6}
.callout-info{background:rgba(59,130,246,.08);border:1px solid rgba(59,130,246,.15);color:#93C5FD}
.callout-warning{background:rgba(234,179,8,.08);border:1px solid rgba(234,179,8,.15);color:#FDE68A}
.callout-tip{background:rgba(34,197,94,.08);border:1px solid rgba(34,197,94,.15);color:#86EFAC}

/* Nav footer */
.nav-footer{display:flex;justify-content:space-between;padding-top:32px;border-top:1px solid var(--border);margin-top:40px}
.nav-prev,.nav-next{font-size:14px;font-weight:600;padding:10px 18px;border-radius:var(--radius-sm);text-decoration:none;transition:all .15s}
.nav-prev{color:var(--text-sub);background:var(--surface);border:1px solid var(--border)}
.nav-prev:hover{color:var(--text);text-decoration:none}
.nav-next{color:#fff;background:var(--coral)}
.nav-next:hover{background:var(--coral-dim);text-decoration:none}

/* Mobile */
.mobile-toggle{display:none;position:fixed;top:12px;left:12px;z-index:200;width:40px;height:40px;border-radius:10px;background:var(--surface);border:1px solid var(--border);color:var(--text);font-size:20px;cursor:pointer;align-items:center;justify-content:center}

@media(max-width:768px){
  .mobile-toggle{display:flex}
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .content{margin-left:0}
  .content-inner{padding:60px 20px 40px}
  .feature-grid{grid-template-columns:1fr}
  .capability-list{grid-template-columns:1fr}
}