:root{
  --bg:#f0f2f5; --card:#fff; --ink:#1c1e21; --muted:#65676b;
  --accent:#1877f2; --accent-d:#0f5ed6; --line:#dadde1; --chip:#e7f0fe;
  --radius:12px; --shadow:0 1px 3px rgba(0,0,0,.08);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Microsoft JhengHei",sans-serif;
  line-height:1.6}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}

/* Header */
.site-header{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:10px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:10px;
  background:var(--accent);color:#fff;font-size:18px}
.brand-text b{display:block;font-size:18px}
.brand-text small{display:block;color:var(--muted);font-size:12px}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{padding:8px 12px;border-radius:8px;color:var(--ink)}
.nav a:hover{background:var(--bg);text-decoration:none}
.searchbar{display:flex;gap:8px;padding:10px 16px 12px;max-width:1040px}
.searchbar input{flex:1;padding:10px 14px;border:1px solid var(--line);border-radius:24px;font-size:15px}
.searchbar button{padding:10px 20px;border:0;border-radius:24px;background:var(--accent);color:#fff;cursor:pointer}
.searchbar button:hover{background:var(--accent-d)}

main.wrap{padding-top:20px;padding-bottom:48px;min-height:60vh}

/* Hero */
.hero{text-align:center;padding:24px 0 8px}
.hero h1{margin:0 0 6px;font-size:28px}
.hero .lead{color:var(--muted);margin:0}
.section-title{font-size:20px;margin:24px 0 14px;border-left:4px solid var(--accent);padding-left:10px}
.count{color:var(--muted);margin:-6px 0 14px}
.empty,.empty-page{color:var(--muted);text-align:center;padding:32px 0}
.empty code{background:var(--card);padding:2px 6px;border-radius:6px}

/* Theme grid */
.theme-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.theme-card{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;
  background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 12px;
  color:var(--ink);border-top:4px solid var(--tc,var(--accent));transition:transform .12s,box-shadow .12s}
.theme-card:hover{transform:translateY(-3px);box-shadow:0 6px 16px rgba(0,0,0,.14);text-decoration:none}
.theme-name{font-size:18px;font-weight:700;color:var(--tc,var(--ink))}
.theme-count{font-size:13px;color:var(--muted)}

/* 主題彩色膠囊（每主題一色）*/
.theme-chip{display:inline-block;background:var(--tc,var(--accent));color:#fff;font-size:12px;
  font-weight:600;padding:2px 10px;border-radius:999px;white-space:nowrap;line-height:1.6}
.theme-chip-link{text-decoration:none}
.theme-chip-link:hover .theme-chip{opacity:.88}
.card-theme{margin-bottom:1px}
/* 導覽列主題前的彩色圓點 */
.nav-theme::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;
  background:var(--tc,var(--accent));margin-right:6px;vertical-align:middle}

/* Card grid */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:16px}
.card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
  color:var(--ink);display:flex;flex-direction:column;transition:transform .12s,box-shadow .12s}
.card:hover{transform:translateY(-2px);box-shadow:0 4px 14px rgba(0,0,0,.12);text-decoration:none}
.card-thumb{position:relative;aspect-ratio:16/9;background:#000}
.card-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.card-thumb .play{position:absolute;inset:0;display:grid;place-items:center;color:#fff;
  font-size:34px;text-shadow:0 2px 8px rgba(0,0,0,.6);opacity:.9}
.card-thumb .noimg{display:grid;place-items:center;height:100%;color:#888}
.card-body{padding:10px 12px;display:flex;flex-direction:column;gap:6px;flex:1}
.card-title{font-weight:600;font-size:15px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-tags{display:flex;flex-wrap:wrap;gap:4px}
.card-date{color:var(--muted);font-size:12px;margin-top:auto}

/* Chips — 關鍵字（主題色淺色調；與實心主題膠囊仍有輕重之分）*/
.chip{display:inline-block;font-size:12px;padding:2px 9px;border-radius:999px;white-space:nowrap;
  background:#eceff3;color:#475569;border:1px solid #e2e6eb; /* 舊瀏覽器 fallback */
  background:color-mix(in srgb, var(--tc,#64748b) 12%, #fff);
  color:color-mix(in srgb, var(--tc,#64748b) 80%, #1c1e21);
  border:1px solid color-mix(in srgb, var(--tc,#64748b) 22%, #fff)}
.chip-link:hover{background:#64748b;color:#fff;border-color:#64748b;text-decoration:none;
  background:var(--tc,#64748b);border-color:var(--tc,#64748b)}
.chip-n{opacity:.55}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud .chip{font-size:14px;padding:5px 12px}

/* Video detail */
.video-detail h1{font-size:24px;margin:0 0 6px}
.meta-row{color:var(--muted);font-size:13px;margin-bottom:14px;display:flex;gap:6px;flex-wrap:wrap}
.embed{position:relative;aspect-ratio:16/9;background:#000;border-radius:var(--radius);overflow:hidden}
.embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.link-row{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}
.ext-link{padding:8px 14px;border-radius:8px;font-size:14px}
.ext-link.yt{background:#ff0000;color:#fff}
.ext-link.fb{background:var(--accent);color:#fff}
.ext-link.dl{background:#10b981;color:#fff}
.ext-link:hover{opacity:.9;text-decoration:none}
.video-note{color:var(--muted);font-size:12px;margin:6px 0 0}
.tags-block{display:flex;flex-wrap:wrap;gap:6px;margin:14px 0}
.summary{background:var(--card);border-radius:var(--radius);padding:16px 18px;margin:16px 0;box-shadow:var(--shadow)}
.summary h2{margin:0 0 8px;font-size:17px}
.summary p{margin:0}
.transcript{background:var(--card);border-radius:var(--radius);padding:0 18px;margin:16px 0;box-shadow:var(--shadow)}
.transcript summary{cursor:pointer;padding:14px 0;font-weight:600}
.copy-btn{margin-left:12px;padding:3px 12px;border:1px solid var(--accent);background:var(--card);
  color:var(--accent);border-radius:8px;font-size:13px;font-weight:500;cursor:pointer;vertical-align:middle}
.copy-btn:hover{background:var(--chip)}
.copy-btn.copied{background:#10b981;color:#fff;border-color:#10b981}
.transcript-body{padding:0 0 18px;color:#333;white-space:pre-wrap}

/* Prose / about */
.prose{background:var(--card);border-radius:var(--radius);padding:20px 24px;box-shadow:var(--shadow);max-width:760px}
.prose .disclaimer{color:var(--muted);font-size:13px;border-top:1px solid var(--line);padding-top:12px;margin-top:16px}

/* Footer */
.site-footer{background:var(--card);border-top:1px solid var(--line);padding:20px 0;margin-top:24px}
.foot-links{text-align:center;color:var(--muted)}
.copyright{text-align:center;color:var(--muted);font-size:13px;margin:6px 0 0}

/* Admin */
.admin-login{max-width:340px;margin:40px auto;background:var(--card);padding:24px;border-radius:var(--radius);box-shadow:var(--shadow);text-align:center}
.admin-login input{width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;margin-bottom:10px}
.admin-login button{padding:10px 24px;border:0;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}
.admin-login .err{color:#c2403a}
.admin-bar{display:flex;justify-content:space-between;align-items:center}
.ok{background:#e7f6ef;color:#1a7f4e;padding:8px 14px;border-radius:8px}
.admin-row{display:grid;grid-template-columns:140px 1fr auto;gap:14px;background:var(--card);
  padding:14px;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:12px;align-items:start}
.admin-thumb img{width:100%;border-radius:8px;display:block}
.admin-edit{display:flex;flex-direction:column;gap:6px}
.admin-edit input,.admin-edit textarea,.admin-edit select{padding:7px 10px;border:1px solid var(--line);border-radius:8px;font:inherit;width:100%}
.admin-meta{font-size:12px;color:var(--muted)}
.admin-edit button{align-self:flex-start;padding:6px 16px;border:0;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}
.admin-actions{display:flex;flex-direction:column;gap:6px}
.admin-actions button{padding:6px 14px;border:1px solid var(--line);border-radius:8px;background:var(--card);cursor:pointer}
.admin-actions .danger{color:#c2403a;border-color:#f0c4c1}

@media(max-width:720px){
  .header-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .nav{width:100%;gap:2px}
  .nav a{padding:7px 9px;font-size:14px}
  .admin-row{grid-template-columns:1fr}
  .admin-thumb img{max-width:200px}
  .hero h1{font-size:24px}
  .video-detail h1{font-size:20px}
}
@media(max-width:480px){
  .wrap{padding:0 12px}
  .brand-text small{display:none}
  .brand-mark{width:34px;height:34px;font-size:15px}
  .brand-text b{font-size:16px}
  .searchbar{padding:8px 12px 10px}
  .searchbar input{padding:9px 12px;font-size:14px}
  .searchbar button{padding:9px 14px}
  .hero{padding:16px 0 4px}
  .hero h1{font-size:21px}
  .section-title{font-size:18px;margin:18px 0 12px}
  .card-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
  .theme-grid{grid-template-columns:repeat(2,1fr)}
  .card-title{font-size:14px}
  .summary,.transcript,.prose{padding-left:14px;padding-right:14px}
  .ext-link{padding:7px 12px;font-size:13px}
  .copy-btn{display:inline-block;margin:6px 0 0;width:auto}
  .transcript summary{display:flex;flex-direction:column;align-items:flex-start;gap:4px}
}