:root{
  --accent:#2563eb;
  --accent-2:#7c3aed;
  --accent-3:#06b6d4;
  --bg:#f3f7fb;
  --bg-soft:#eef4ff;
  --panel:#ffffff;
  --panel-2:#f8fbff;
  --sidebar:#f7faff;
  --border:#d8e3f0;
  --text:#0f172a;
  --muted:#475569;
  --nav:#0b1220;
  --nav-2:#121b2e;
  --code:#0f172a;
  --code-text:#e2ecff;
  --note:#eef2ff;
  --tip:#ecfeff;
  --warn:#fff7ed;
  --shadow:0 18px 40px rgba(15,23,42,.08);
  --shadow-soft:0 8px 24px rgba(37,99,235,.08);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Inter","Noto Sans TC","Segoe UI",Arial,sans-serif;background:radial-gradient(circle at top right,rgba(124,58,237,.09),transparent 28%),radial-gradient(circle at top left,rgba(6,182,212,.08),transparent 26%),linear-gradient(180deg,#f8fbff 0%,#f1f6fb 100%);color:var(--text)}
a{text-decoration:none;color:inherit}
.topbar{position:sticky;top:0;z-index:1000;min-height:72px;background:linear-gradient(135deg,var(--nav) 0%,var(--nav-2) 100%);color:#fff;display:flex;align-items:center;padding:12px 22px;gap:18px;border-bottom:1px solid rgba(148,163,184,.18);box-shadow:0 16px 32px rgba(2,8,23,.22);backdrop-filter:blur(14px)}
.logo{font-size:22px;font-weight:900;white-space:nowrap;letter-spacing:.02em;background:linear-gradient(90deg,#93c5fd,#c4b5fd 55%,#67e8f9);-webkit-background-clip:text;background-clip:text;color:transparent}
.top-links{display:flex;gap:8px;font-size:14px;color:#dbe7ff;flex-wrap:wrap}
.top-links a{padding:10px 12px;border-radius:999px;transition:.2s ease}
.top-links a:hover{background:rgba(255,255,255,.08);color:#fff}
.search-mini{margin-left:auto;display:flex;align-items:center;gap:8px}
.search-mini input{height:42px;border-radius:999px;border:1px solid rgba(148,163,184,.2);outline:none;padding:0 18px;min-width:280px;background:rgba(255,255,255,.96);color:#0f172a;box-shadow:inset 0 0 0 1px rgba(255,255,255,.25),0 10px 30px rgba(15,23,42,.15)}
.layout{display:flex;min-height:calc(100vh - 72px);max-width:1600px;margin:0 auto}
.sidebar{width:300px;background:linear-gradient(180deg,rgba(255,255,255,.92) 0%,rgba(247,250,255,.98) 100%);border-right:1px solid var(--border);height:calc(100vh - 72px);overflow-y:auto;position:sticky;top:72px;flex-shrink:0;padding:14px 10px 20px;box-shadow:inset -1px 0 0 rgba(255,255,255,.7)}
.sidebar-title{font-size:22px;font-weight:800;padding:10px 14px 8px;margin:0;color:#0f172a}
.sidebar .group-label{padding:14px 14px 8px;color:#64748b;font-size:12px;text-transform:uppercase;letter-spacing:.12em;font-weight:700}
.sidebar a{display:block;padding:11px 14px;font-size:14px;color:#1e293b;border:1px solid transparent;border-radius:12px;transition:.18s ease;margin:2px 6px}
.sidebar a:hover{background:#eef4ff;border-color:#dbeafe;color:#1d4ed8;transform:translateX(2px)}
.sidebar a.active{background:linear-gradient(135deg,#2563eb 0%,#7c3aed 100%);color:#fff;border-color:transparent;font-weight:800;box-shadow:0 12px 24px rgba(37,99,235,.26)}
.content{flex:1;min-width:0;padding:34px 42px 76px;max-width:1160px}
.breadcrumb{font-size:13px;color:#64748b;margin-bottom:12px}.breadcrumb a{color:#2563eb;font-weight:700}
h1{font-size:48px;font-weight:900;letter-spacing:-.02em;margin:0 0 20px;color:#0f172a}
h2{font-size:32px;font-weight:850;letter-spacing:-.015em;margin-top:48px;margin-bottom:16px;scroll-margin-top:100px;color:#111827}
h3{font-size:24px;font-weight:800;margin-top:26px;margin-bottom:12px}h4{margin:0 0 8px;font-size:18px}
p,li{font-size:16px;line-height:1.8;color:var(--text)}
.page-nav,.footer-nav{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:16px 0 28px}
.footer-nav{margin-top:48px;padding-top:20px;border-top:1px solid #dbe3ee}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-2) 100%);color:#fff;padding:12px 18px;border-radius:12px;font-size:16px;font-weight:800;border:none;cursor:pointer;box-shadow:0 14px 28px rgba(37,99,235,.22);transition:.18s ease}
.btn:hover{transform:translateY(-1px);filter:brightness(1.02)}
.btn.secondary{background:#fff;color:#0f172a;border:1px solid #d7e2ef;box-shadow:var(--shadow-soft)}
.hero-box{background:linear-gradient(135deg,#0f172a 0%,#1e3a8a 55%,#334155 100%);color:#fff;border:1px solid rgba(96,165,250,.18);border-radius:24px;padding:30px 26px;margin-bottom:30px;box-shadow:0 26px 50px rgba(15,23,42,.18);position:relative;overflow:hidden}
.hero-box::after{content:"";position:absolute;inset:auto -60px -60px auto;width:220px;height:220px;background:radial-gradient(circle,rgba(255,255,255,.16),transparent 65%)}
.hero-box h3,.hero-box p,.hero-box li{color:#fff}
.tag{display:inline-block;background:rgba(255,255,255,.12);color:#dbeafe;border:1px solid rgba(255,255,255,.18);backdrop-filter:blur(8px);border-radius:999px;padding:7px 12px;font-size:12px;margin-bottom:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.example-box,.info-box{background:linear-gradient(180deg,#fff 0%,#f9fbff 100%);padding:20px;border-radius:20px;margin:22px 0;border:1px solid #dce8f5;box-shadow:var(--shadow)}
.example-box h3,.info-box h3{margin-top:0;margin-bottom:12px}
.code-wrapper{background:linear-gradient(180deg,#0f172a 0%,#111c33 100%);border:1px solid rgba(96,165,250,.18);padding:18px 18px;overflow-x:auto;margin-bottom:14px;border-radius:16px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.03)}
pre{margin:0;font-family:Consolas,Monaco,monospace;font-size:15px;line-height:1.7;color:var(--code-text);white-space:pre-wrap}
code{font-family:Consolas,Monaco,monospace;background:#eaf1ff;padding:2px 6px;border-radius:6px;font-size:.95em;color:#1d4ed8}
.note,.tip{padding:18px 20px;border-left:4px solid var(--accent);margin:18px 0;border-radius:14px;box-shadow:var(--shadow-soft)}
.note{background:var(--note)}
.tip{background:var(--tip);border-left-color:var(--accent-3)}
.data-table{overflow-x:auto;margin:18px 0 8px}
table{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}
th,td{text-align:left;padding:12px 13px;border-bottom:1px solid #e5edf6;font-size:15px}
th{background:#eff6ff;color:#0f172a;font-weight:800}tr:nth-child(even) td{background:#fbfdff}
.card-grid{display:grid;grid-template-columns:repeat(2,minmax(260px,1fr));gap:16px;margin-top:18px}
.card{border:1px solid #dde7f2;border-radius:20px;padding:20px;background:linear-gradient(180deg,#fff 0%,#f9fbff 100%);box-shadow:var(--shadow);transition:.2s ease}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 44px rgba(15,23,42,.12)}
.card p{font-size:14px;color:#475569;margin:0 0 12px}
.mini-link{color:#2563eb;font-weight:800;font-size:14px}
.quiz-box{background:linear-gradient(135deg,#0f172a 0%,#1e293b 100%);color:#fff;border-radius:20px;padding:24px;margin-top:24px;box-shadow:var(--shadow)}.quiz-box p{color:#e2e8f0}.quiz-options{display:grid;gap:10px;margin-top:14px}.quiz-options button{text-align:left;padding:13px 14px;border-radius:12px;border:1px solid #cbd5e1;cursor:pointer;font-size:15px;background:#fff;color:#111827}.quiz-result{margin-top:14px;font-weight:800;font-size:15px}
.reference-list{display:grid;gap:12px;margin-top:12px}.reference-item{padding:16px 18px;border:1px solid #dbe3ee;border-radius:16px;background:#fff;box-shadow:var(--shadow)}.reference-item strong{display:block;margin-bottom:4px}
.copy-btn{background:linear-gradient(135deg,#0f172a 0%,#1e40af 100%);color:#fff;border:none;padding:10px 13px;border-radius:10px;cursor:pointer;font-size:14px;font-weight:700;margin-bottom:12px;box-shadow:0 10px 20px rgba(15,23,42,.16)}
.copy-btn:hover{filter:brightness(1.04)}
.backtop{position:fixed;right:20px;bottom:20px;width:50px;height:50px;border-radius:50%;border:none;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-2) 100%);color:#fff;cursor:pointer;font-size:18px;display:none;box-shadow:0 16px 30px rgba(37,99,235,.24)}
.hero-split{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:start}.stat-list{display:grid;gap:12px}.stat{background:rgba(255,255,255,.12);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:14px 16px}.stat strong{font-size:22px;color:#fff}
.chips{display:flex;flex-wrap:wrap;gap:9px}.chip{display:inline-block;padding:7px 11px;border-radius:999px;background:#fff;border:1px solid #d8e7ff;font-size:13px;color:#1e3a8a;font-weight:700}
.callout-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px}
.small{font-size:14px;color:var(--muted)}
.footer-note{margin-top:28px;color:#64748b;font-size:14px}
.example-stack{display:grid;gap:18px}
.mini-table{display:grid;grid-template-columns:repeat(2,minmax(200px,1fr));gap:14px;margin:16px 0}
.mini-panel{background:#fff;border:1px solid #dbe5f3;border-radius:16px;padding:16px;box-shadow:var(--shadow-soft)}
.section-intro{font-size:17px;color:#334155;margin-bottom:12px}
@media (max-width:1100px){.sidebar{width:248px}.content{padding:26px 24px 54px}.card-grid,.mini-table{grid-template-columns:1fr}.hero-split{grid-template-columns:1fr}h1{font-size:38px}}
@media (max-width:768px){.layout{display:block}.sidebar{position:relative;top:0;width:100%;height:auto;border-right:none;border-bottom:1px solid #dbe3ee;padding-bottom:12px}.content{padding:20px 16px 42px}.topbar{flex-wrap:wrap;min-height:auto}.search-mini{margin-left:0;width:100%}.search-mini input{width:100%;min-width:0}h1{font-size:30px}h2{font-size:26px}.top-links{gap:4px}}