:root{
  --primary:#4f46e5;--primary-dark:#3730a3;--accent:#f59e0b;
  --bg:#f8fafc;--bg-soft:#eef2ff;--card:#ffffff;--text:#1e293b;--text-soft:#64748b;--border:#e2e8f0;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans TC","Microsoft JhengHei","PingFang TC",system-ui,sans-serif;
  color:var(--text);background:var(--bg);line-height:1.8;font-size:17px}
a{color:var(--primary-dark);text-decoration:none}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1080px;margin:0 auto;padding:0 1.25rem}
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.nav{display:flex;justify-content:space-between;align-items:center;padding:.85rem 1.25rem;flex-wrap:wrap;gap:.5rem}
.brand{display:flex;align-items:center;gap:.55rem;font-weight:700;font-size:1.2rem;color:var(--text)}
.logo{width:34px;height:34px;border-radius:9px;background:var(--primary);color:#fff;display:inline-flex;
  align-items:center;justify-content:center;font-weight:700}
.menu{display:flex;gap:1rem;list-style:none;flex-wrap:wrap}
.menu a{color:var(--text-soft);font-size:.95rem;font-weight:500}
.menu a:hover{color:var(--primary-dark)}
.hero{background:linear-gradient(180deg,var(--bg-soft),var(--bg));text-align:center;padding:3.5rem 0 2.5rem}
.hero h1{font-size:2.4rem;color:var(--primary-dark);margin-bottom:.5rem}
.tagline{color:var(--text-soft);font-size:1.1rem}
.grid{display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));padding:2.5rem 0}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden;
  display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(15,23,42,.1)}
.card-thumb{display:block;aspect-ratio:16/9;background:var(--bg-soft);overflow:hidden}
.card-thumb img{width:100%;height:100%;object-fit:cover}
.thumb-ph{width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  font-size:2.5rem;color:var(--primary);background:var(--bg-soft)}
.card-body{padding:1.25rem;display:flex;flex-direction:column;gap:.5rem;flex:1}
.card-body h2{font-size:1.2rem;line-height:1.4}
.card-body h2 a{color:var(--text)}
.card-body p{color:var(--text-soft);font-size:.95rem;flex:1}
.more{font-weight:600;font-size:.92rem}
.tag{display:inline-block;background:var(--bg-soft);color:var(--primary-dark);
  font-size:.8rem;font-weight:600;padding:.2rem .7rem;border-radius:999px;align-self:flex-start}
.article-hero{background:var(--bg-soft);padding:2.75rem 0 1.5rem;text-align:center}
.article-hero h1{font-size:2rem;margin:.75rem 0;color:var(--text)}
.article-meta{color:var(--text-soft);font-size:.9rem}
.article{max-width:760px;padding-top:2rem;padding-bottom:3rem}
.article h2{font-size:1.5rem;margin:2rem 0 .9rem;color:var(--primary-dark);
  border-left:4px solid var(--primary);padding-left:.7rem}
.article h3{font-size:1.2rem;margin:1.4rem 0 .6rem}
.article p{margin:0 0 1rem}
.article ul,.article ol{margin:0 0 1.2rem;padding-left:1.5rem}
.article li{margin-bottom:.4rem}
.hero-img{margin:0 0 1.75rem;text-align:center}
.hero-img img{width:100%;border-radius:14px;max-height:420px;object-fit:cover}
.hero-img figcaption{color:var(--text-soft);font-size:.82rem;margin-top:.4rem;font-style:italic}
.ai-tldr{border-radius:10px}
.toc{font-size:.95rem}
.toc a{color:var(--primary-dark)}
.back{margin-top:2.5rem}
iframe{max-width:100%;border-radius:12px;aspect-ratio:16/9;width:100%;height:auto;border:0}
.site-footer{background:#0f172a;color:#cbd5e1;margin-top:3rem;padding:2.5rem 0;text-align:center}
.foot-brand{color:#fff;font-weight:700;font-size:1.15rem}
.foot-tag{font-size:.92rem;opacity:.8;margin:.25rem 0 1rem}
.foot-copy{font-size:.82rem;opacity:.6}
@media(max-width:640px){.hero h1{font-size:1.9rem}.article-hero h1{font-size:1.6rem}}