:root {
  --bg: #0f172a; --card: #1e293b; --card2: #263449; --text: #e2e8f0;
  --muted: #94a3b8; --line: #334155; --accent: #38bdf8; --accent2: #0ea5e9;
  --new: #22c55e; --star: #fbbf24; --danger: #ef4444;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f1f5f9; --card: #ffffff; --card2: #f8fafc; --text: #0f172a;
    --muted: #64748b; --line: #e2e8f0; --accent: #0284c7; --accent2: #0369a1;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.55 -apple-system, "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  padding-bottom: 40px;
}

#topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg); border-bottom: 1px solid var(--line);
  padding: 10px 12px calc(8px + env(safe-area-inset-top)); padding-top: calc(10px + env(safe-area-inset-top));
}
#topbar .row { display: flex; align-items: center; justify-content: space-between; }
h1 { font-size: 18px; margin: 0; }
.icon-btn {
  background: var(--card); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; width: 36px; height: 36px; font-size: 18px; cursor: pointer;
}
#search {
  width: 100%; margin: 8px 0; padding: 9px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--card); color: var(--text); font-size: 15px;
}
.tabs { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 4px; -webkit-overflow-scrolling: touch; }
.tabs::-webkit-scrollbar { display: none; }
.tab {
  flex: 0 0 auto; padding: 6px 12px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: var(--card); color: var(--muted); font-size: 14px; white-space: nowrap;
}
.tab.active { background: var(--accent); color: #04283a; border-color: var(--accent); font-weight: 600; }
.toggles { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 8px; font-size: 13px; color: var(--muted); }
.toggles label { display: flex; align-items: center; gap: 4px; }
.stat { margin-left: auto; }

#list { padding: 12px; display: flex; flex-direction: column; gap: 12px; max-width: 760px; margin: 0 auto; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px;
}
.card.dim { opacity: 0.5; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 6px; }
.chip { font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--card2); color: var(--muted); }
.chip.topic { background: rgba(56,189,248,0.15); color: var(--accent); }
.chip.new { background: rgba(34,197,94,0.18); color: var(--new); font-weight: 600; }
.title { font-size: 16px; margin: 2px 0 6px; line-height: 1.4; }
.meta { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.abstract { font-size: 14px; color: var(--text); background: var(--card2); border-radius: 10px; padding: 10px; margin-bottom: 8px; }
.zh { font-size: 14.5px; white-space: pre-wrap; background: rgba(56,189,248,0.08); border-left: 3px solid var(--accent); border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; }
.zh.loading { color: var(--muted); }

.actions { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.act {
  background: var(--card2); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; font-size: 13px; cursor: pointer; text-decoration: none;
}
.act:active { transform: scale(0.96); }
.act.summarize { background: var(--accent); color: #04283a; border-color: var(--accent); font-weight: 600; }
.spacer { flex: 1; }
.act.on.up { background: rgba(34,197,94,0.25); border-color: var(--new); }
.act.on.down { background: rgba(239,68,68,0.25); border-color: var(--danger); }
.act.on.star { background: rgba(251,191,36,0.28); border-color: var(--star); }
.empty { text-align: center; color: var(--muted); padding: 40px 20px; }