:root{--bg:#0B1026;--bg2:#121A36;--card:#161F3F;--line:#243055;--text:#F4F6FB;--muted:#AEB8CC;--gold:#FFB300;--cyan:#4FC3F7;--green:#66BB6A;--radius:16px;--max:1120px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,"PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.75;-webkit-font-smoothing:antialiased;padding-bottom:calc(84px + env(safe-area-inset-bottom))}
@media(min-width:860px){body{padding-bottom:0}}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--gold);color:#0B1026;font-weight:700;padding:14px 26px;border-radius:999px;font-size:17px;transition:transform .15s,box-shadow .15s;box-shadow:0 8px 24px rgba(255,179,0,.25)}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(255,179,0,.35)}
.btn.ghost{background:transparent;color:var(--text);border:1px solid rgba(255,255,255,.35);box-shadow:none}
.btn.small{padding:10px 18px;font-size:15px}
nav{position:sticky;top:0;z-index:20;background:rgba(11,16,38,.85);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:20px}
.logo svg{width:24px;height:24px}
nav ul{display:none;gap:22px;list-style:none;color:var(--muted);font-size:15px}
nav ul a:hover{color:var(--text)}
@media(min-width:860px){nav ul{display:flex}}
.crumbs{font-size:13px;color:var(--muted);margin:24px 0 8px}
.crumbs a{color:var(--cyan)}
.article{max-width:780px;margin:0 auto;padding:16px 0 56px}
.article h1{font-size:clamp(26px,4.2vw,40px);line-height:1.3;font-weight:700;letter-spacing:-.3px;margin:8px 0 12px}
.meta{color:var(--muted);font-size:13.5px;display:flex;flex-wrap:wrap;gap:6px 16px;margin-bottom:22px}
.lead{font-size:18px;color:var(--text)}
.tldr{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:12px;padding:18px 20px;margin:22px 0}
.tldr b{color:var(--gold);display:block;margin-bottom:8px;font-size:14px;letter-spacing:1px}
.tldr p{margin-bottom:10px}
.tldr ul{margin:0 0 0 20px;color:var(--text)}
.toc{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:0 0 28px;font-size:14.5px}
.toc b{display:block;margin-bottom:6px;color:var(--muted);font-size:13px}
.toc ol{margin-left:18px}
.toc a{color:var(--cyan)}
.body h2{font-size:clamp(21px,3vw,27px);font-weight:700;line-height:1.3;margin:40px 0 12px;padding-top:4px}
.body h3{font-size:18px;font-weight:700;margin:26px 0 8px}
.body p{margin:0 0 14px;color:var(--text)}
.body ul,.body ol{margin:0 0 16px 22px}
.body li{margin-bottom:6px}
.body li b,.body p b{color:#fff}
.body a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.body table{width:100%;border-collapse:collapse;margin:14px 0 20px;font-size:14.5px;display:block;overflow-x:auto}
.body th,.body td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
.body th{background:var(--bg2);color:var(--text);white-space:nowrap}
.body blockquote{border-left:3px solid var(--cyan);padding:6px 16px;color:var(--muted);margin:0 0 16px}
.body code{background:var(--bg2);padding:2px 6px;border-radius:6px;font-size:.92em}
.cta-box{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;background:linear-gradient(135deg,rgba(255,179,0,.14),rgba(79,195,247,.10));border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin:28px 0}
.cta-box b{font-size:18px;display:block;margin-bottom:4px}
.cta-box p{color:var(--muted);font-size:14px;margin:0}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--gold);font-size:22px;flex:none}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--muted);margin-top:10px;font-size:15px}
.sources{font-size:14px;color:var(--muted)}
.sources ol{margin-left:20px}
.sources a{color:var(--cyan)}
.related{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-top:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:block;transition:border-color .15s}
.card:hover{border-color:var(--gold)}
.card h3{font-size:16px;font-weight:700;margin-bottom:6px;line-height:1.4}
.card p{color:var(--muted);font-size:14px}
.card small{color:var(--muted);font-size:12.5px;display:block;margin-top:8px}
.section-title{font-size:20px;font-weight:700;margin:44px 0 12px}
.final{background:linear-gradient(180deg,var(--bg2),var(--bg));border-top:1px solid var(--line);padding:56px 0;text-align:center}
.final h2{font-size:clamp(22px,3.4vw,32px);margin-bottom:10px}
.final p{color:var(--muted);max-width:620px;margin:0 auto 22px}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:13px}
footer .wrap{display:grid;gap:10px}
footer a{color:var(--cyan)}
.sticky{position:fixed;left:0;right:0;bottom:0;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:rgba(11,16,38,.92);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--line);z-index:30;display:flex;justify-content:center;transform:translateY(110%);transition:transform .25s}
.sticky.show{transform:none}
.sticky .btn{width:100%;max-width:480px}
@media(min-width:860px){.sticky{display:none}}
.hub{padding:40px 0 60px}
.hub h1{font-size:clamp(26px,4.2vw,40px);margin-bottom:10px}
.hub .sub{color:var(--muted);font-size:17px;max-width:720px;margin-bottom:28px}
.hub .related{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}