:root{
  --bg:#fff;--bg2:#fafafa;--bg3:#f5f5f7;
  --ink:#0a0a13;--ink2:#3c3c47;--ink3:#6e6e80;
  --line:#e5e5ea;--line2:#d1d1d6;
  --purple:#7c3aed;--purple2:#a855f7;--purple-soft:rgba(124,58,237,.08);
  --grad:linear-gradient(135deg,#7c3aed 0%,#a855f7 60%,#ec4899 100%);
  --font-ui:'Inter','Noto Sans TC',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,monospace;
  --r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:24px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-ui);color:var(--ink);background:var(--bg);line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
.container{max-width:1100px;margin:0 auto;padding:0 24px}

/* nav */
nav.top{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--line)}
nav.top .inner{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:1100px;margin:0 auto}
.logo{display:flex;align-items:center;gap:10px}
.logo-mark{width:32px;height:32px;border-radius:9px;background:var(--grad);display:grid;place-items:center;box-shadow:0 4px 12px rgba(124,58,237,.25)}
.logo-mark svg{width:16px;height:16px;fill:#fff}
.logo-text{font-weight:800;font-size:18px;letter-spacing:-.01em;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.nav-links{display:flex;gap:4px;align-items:center}
.nav-links a{padding:8px 14px;font-size:14px;color:var(--ink2);border-radius:8px;transition:all .15s;font-weight:500}
.nav-links a:hover{background:var(--bg3);color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;font-size:13px;font-weight:600;border-radius:12px;border:none;cursor:pointer;transition:all .15s;line-height:1}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 4px 16px rgba(124,58,237,.3)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(124,58,237,.4)}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--bg3)}
.btn-lg{padding:14px 22px;font-size:15px;border-radius:14px}
@media(max-width:720px){.nav-links{display:none}}

/* breadcrumb */
.crumb{font-size:13px;color:var(--ink3);padding:24px 0 0}
.crumb a:hover{color:var(--purple)}
.crumb span{margin:0 6px;opacity:.5}

/* article */
article{padding:24px 0 64px;max-width:760px;margin:0 auto}
article .eyebrow{font-family:var(--font-mono);font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.16em;color:var(--purple);margin:24px 0 14px}
article h1{font-size:38px;font-weight:800;letter-spacing:-.025em;line-height:1.15;margin-bottom:16px}
article .meta{font-family:var(--font-mono);font-size:12px;color:var(--ink3);margin-bottom:8px;padding-bottom:28px;border-bottom:1px solid var(--line)}
article h2{font-size:24px;font-weight:700;letter-spacing:-.02em;margin:40px 0 14px}
article h3{font-size:18px;font-weight:700;margin:26px 0 10px}
article p{font-size:16px;line-height:1.85;color:var(--ink2);margin-bottom:16px}
article ul,article ol{margin:0 0 18px;padding-left:24px}
article li{font-size:16px;line-height:1.8;color:var(--ink2);margin-bottom:8px}
article strong{color:var(--ink);font-weight:700}
article a{color:var(--purple);text-decoration:underline;text-underline-offset:2px}
article .lead{font-size:18px;line-height:1.8;color:var(--ink2);margin:24px 0}
.callout{background:var(--purple-soft);border:1px solid rgba(124,58,237,.2);border-radius:var(--r-lg);padding:18px 20px;margin:24px 0;font-size:15px;line-height:1.7}
.kv{border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;margin:20px 0}
.kv table{width:100%;border-collapse:collapse}
.kv th,.kv td{text-align:left;padding:12px 16px;font-size:14px;border-bottom:1px solid var(--line);vertical-align:top}
.kv th{background:var(--bg3);font-family:var(--font-mono);font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink3);font-weight:600}
.kv tr:last-child td{border-bottom:none}

/* CTA */
.cta{background:var(--grad);border-radius:var(--r-xl);padding:36px 32px;text-align:center;margin:48px 0 8px;color:#fff}
.cta h3{font-size:22px;font-weight:800;margin-bottom:8px;color:#fff}
.cta p{font-size:15px;color:rgba(255,255,255,.9);margin-bottom:20px}
.cta .btn{background:#fff;color:var(--purple);font-weight:700}
.cta .btn:hover{transform:translateY(-1px)}

/* related */
.related{max-width:760px;margin:0 auto;padding:0 0 40px}
.related h4{font-size:13px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.1em;color:var(--ink3);margin-bottom:14px}
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.related-grid a{border:1px solid var(--line);border-radius:var(--r-md);padding:16px 18px;font-size:15px;font-weight:600;transition:border-color .15s}
.related-grid a:hover{border-color:var(--purple)}
@media(max-width:600px){.related-grid{grid-template-columns:1fr}}

/* hub */
.hub{padding:40px 0 64px;max-width:860px;margin:0 auto}
.hub h1{font-size:34px;font-weight:800;letter-spacing:-.02em;margin-bottom:10px}
.hub .sub{font-size:16px;color:var(--ink3);margin-bottom:32px}
.card-list{display:flex;flex-direction:column;gap:14px}
.guide-card{display:block;border:1px solid var(--line);border-radius:var(--r-xl);padding:24px 26px;transition:border-color .15s,transform .15s}
.guide-card:hover{border-color:var(--purple);transform:translateY(-2px)}
.guide-card h2{font-size:20px;font-weight:700;margin-bottom:6px}
.guide-card p{font-size:14px;color:var(--ink3);line-height:1.6}

/* footer */
footer{border-top:1px solid var(--line);background:var(--bg2);padding:40px 0}
footer .inner{max-width:1100px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:var(--ink3)}
footer a:hover{color:var(--purple)}