:root {
  color-scheme: light;
  --bg: #f3efe6;
  --card: #fffdf8;
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e4ddd0;
  --accent: #c2410c;
  --accent-ink: #fff7ed;
  --side: #1c1917;
  --side-ink: #f5f0e8;
  --side-muted: #a8a29e;
  --chip: #f5f0e6;
  --shadow: 0 1px 2px rgba(28, 25, 23, 0.06);
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", "PMingLiU", "Songti TC", serif;
  --sans: "Segoe UI", "Microsoft JhengHei UI", "PingFang TC", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    color-scheme: dark;
    --bg: #12110f;
    --card: #1c1a17;
    --ink: #f5f0e8;
    --muted: #a8a29e;
    --line: #3a342c;
    --accent: #fb923c;
    --accent-ink: #1c1917;
    --side: #0c0b0a;
    --chip: #2a261f;
    --shadow: none;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #12110f;
  --card: #1c1a17;
  --ink: #f5f0e8;
  --muted: #a8a29e;
  --line: #3a342c;
  --accent: #fb923c;
  --accent-ink: #1c1917;
  --side: #0c0b0a;
  --chip: #2a261f;
  --shadow: none;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
}
button, input, select { font: inherit; color: inherit; }
a { color: var(--accent); }

#app { display: flex; min-height: 100vh; }
#side {
  width: 268px;
  flex: none;
  background: var(--side);
  color: var(--side-ink);
  padding: 22px 16px 32px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}
.brand {
  color: var(--side-ink);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 28px;
  letter-spacing: 0.02em;
}
.company { display: block; margin: 0 0 14px; }
.company img { display: block; width: 150px; height: auto; }
.brand-sub { color: var(--side-muted); font-size: 13px; margin: 4px 0 18px; }
#nav { display: flex; flex-direction: column; gap: 2px; }
#nav button, .area-btn, .cat-link {
  background: transparent;
  border: 0;
  color: var(--side-ink);
  text-align: left;
  padding: 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  display: block;
  width: 100%;
}
#nav button:hover, .area-btn:hover, .cat-link:hover { background: rgba(255,255,255,0.06); }
#nav button.active, .cat-link.active { background: var(--accent); color: var(--accent-ink); }
.area { margin-top: 4px; }
.area-btn { color: var(--side-muted); font-size: 13px; }
.area ul { list-style: none; margin: 0; padding: 0 0 4px 8px; display: none; }
.area.open ul { display: block; }
.cat-link { font-size: 14px; padding: 4px 10px; color: var(--side-ink); }

#maincol { flex: 1; min-width: 0; display: flex; flex-direction: column; }
#top {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 2;
  flex-wrap: wrap;
}
#menu-btn { display: none; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; cursor: pointer; }
#q {
  flex: 1;
  min-width: 180px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
}
#top label { font-size: 13px; color: var(--muted); display: flex; gap: 6px; align-items: center; }
#top select { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }

#view { padding: 20px; flex: 1; }
#credit {
  padding: 14px 20px 22px;
  color: var(--muted);
  font-size: 12px;
  border-top: 1px solid var(--line);
}

.page-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.page-head h1 { font-family: var(--serif); font-weight: 500; font-size: 32px; margin: 0; }
.count { color: var(--muted); font-size: 14px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}
.thumb-link { display: block; aspect-ratio: 16/9; background: #292524; }
.thumb-link img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-body { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.card-title {
  color: inherit;
  text-decoration: none;
  font-weight: 650;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-title:hover { color: var(--accent); }
.channel { color: var(--muted); font-size: 13px; }
.card-meta { margin-top: auto; display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.icon-row { display: flex; gap: 4px; }
.icon-btn, .text-btn {
  background: var(--chip);
  border: 0;
  border-radius: 999px;
  padding: 4px 8px;
  cursor: pointer;
}
.icon-btn.on { background: var(--accent); color: var(--accent-ink); }
.more-wrap { display: flex; justify-content: center; margin: 18px 0 8px; }
.text-btn { padding: 8px 16px; }

.watch { max-width: 980px; }
.player {
  position: relative;
  padding-top: 56.25%;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
}
.player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.watch h1 { font-family: var(--serif); font-weight: 500; font-size: 30px; margin: 14px 0 4px; }
.watch-actions { display: flex; gap: 8px; margin: 12px 0; flex-wrap: wrap; }
.prose h2 { font-size: 15px; letter-spacing: 0.04em; color: var(--muted); font-weight: 650; margin: 22px 0 6px; }
.prose p { margin: 0 0 8px; }
.quote {
  margin: 0;
  padding: 8px 0 8px 14px;
  border-left: 3px solid var(--accent);
  font-family: var(--serif);
  font-size: 18px;
}
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  background: var(--chip);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 13px;
  color: inherit;
  text-decoration: none;
}
.mention {
  border-top: 1px solid var(--line);
  padding: 10px 0;
}
.mention .who { font-size: 13px; color: var(--muted); }
.rail { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.rail a.mini {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 8px;
  text-decoration: none;
  color: inherit;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.rail img { width: 96px; height: 64px; object-fit: cover; background: #292524; }
.mini span { padding: 6px 6px 6px 0; font-size: 13px; line-height: 1.35; }
.empty { color: var(--muted); padding: 24px 0; }
.clear-filter { padding: 8px 16px; border: 1px solid var(--line, #ddd); border-radius: 999px; background: var(--card, #fff); color: inherit; font: inherit; cursor: pointer; }
.settings label { display: flex; gap: 8px; align-items: center; margin: 8px 0; }
.note { color: var(--muted); font-size: 14px; }

@media (max-width: 860px) {
  #menu-btn { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; padding: 0; font-size: 20px; line-height: 1; }
  #side {
    position: fixed;
    z-index: 5;
    width: min(82vw, 300px);
    padding: 18px 14px 32px;
    transform: translateX(-105%);
    transition: transform 0.18s ease;
    box-shadow: 4px 0 24px rgba(0,0,0,0.25);
  }
  #side.open { transform: none; }
  #scrim { position: fixed; inset: 0; z-index: 4; background: rgba(0,0,0,0.45); }
  body.menu-open #scrim { display: block; }
  body.menu-open { overflow: hidden; }
  .company img { width: 120px; }
  .brand { font-size: 24px; }
}
#scrim { display: none; }

/* 頂欄金色標誌（2026-11-02）：只在手機出現（電腦版側欄已有標誌，不重複）；深色主題換米白字版 */
.top-logo { display: none; align-items: center; flex: none; }
.top-logo img { display: block; height: 24px; width: auto; }
.top-logo .tl-dark { display: none; }
:root[data-theme="dark"] .top-logo .tl-light { display: none; }
:root[data-theme="dark"] .top-logo .tl-dark { display: block; }
@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] .top-logo .tl-light { display: none; }
  :root[data-theme="auto"] .top-logo .tl-dark { display: block; }
}
@media (max-width: 860px) {
  .top-logo { display: flex; }
  #top { gap: 8px; padding: 12px 14px; }
  #q { flex: 1 1 160px; min-width: 0; }
}

/* 置頂分類（金屬材料學）：分類清單第一區，預設展開，用金色左線標出 */
.area.featured { border-left: 3px solid #d9a12b; margin-bottom: 8px; }
.area.featured > .area-btn { font-weight: 600; }