/* 基础变量与主题 */
:root {
  --bg: #ffffff;
  --fg: #111827;
  --muted: #6b7280;
  --card: #f9fafb;
  --card-border: #e5e7eb;
  --brand: #111827;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #ef4444;
  --chip: #eef2ff;
  --chip-fg: #3730a3;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 6px 20px rgba(0,0,0,.06);
}

:root.dark {
  --bg: #0b0f14;
  --fg: #e5e7eb;
  --muted: #9ca3af;
  --card: #111827;
  --card-border: #1f2937;
  --brand: #e5e7eb;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #f87171;
  --chip: #0b1220;
  --chip-fg: #93c5fd;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 14px/1.5 system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center;
  padding: 16px clamp(16px, 4vw, 28px);
  backdrop-filter: saturate(1.1) blur(6px);
  background: color-mix(in hsl, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--card-border);
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.logo { width: 28px; height: 28px; display: inline-grid; place-items: center; border-radius: 8px; background: var(--chip); color: var(--chip-fg); }
.title { margin: 0; font-size: 18px; font-weight: 700; color: var(--brand); }

.actions { display: inline-flex; gap: 8px; align-items: center; }
.search { position: relative; display: inline-flex; align-items: center; }
.search input {
  width: min(56vw, 520px);
  padding: 10px 36px 10px 12px;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  background: var(--card);
  color: var(--fg);
  outline: none;
}
#clearSearch {
  position: absolute; right: 6px; border-radius: 8px; opacity: .6; display: none;
}

.icon-btn, .btn {
  height: 36px; min-width: 36px; padding: 0 10px; border: 1px solid var(--card-border);
  background: var(--card); color: var(--fg); border-radius: 10px; cursor: pointer;
}
.icon-btn:hover, .btn:hover { filter: brightness(1.02); }
.primary-btn {
  height: 36px; padding: 0 14px; border: 1px solid color-mix(in hsl, var(--primary) 30%, var(--card-border));
  background: var(--primary); color: #fff; border-radius: 10px; cursor: pointer;
}
.primary-btn:hover { background: var(--primary-hover); }
.danger-btn { background: var(--danger); color: #fff; border: none; }

/* Categories */
.categories {
  display: flex; gap: 8px; padding: 10px clamp(16px, 4vw, 28px); overflow: auto;
}
.categories::-webkit-scrollbar { height: 8px; }
.categories .chip {
  white-space: nowrap; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--card-border);
  background: var(--chip); color: var(--chip-fg); cursor: pointer; font-size: 12px;
}
.categories .chip.active { outline: 2px solid color-mix(in hsl, var(--primary) 60%, transparent); }

/* Grid */
main { padding: 10px clamp(16px, 4vw, 28px) 28px; }
.grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

/* Card */
.card {
  position: relative; border: 1px solid var(--card-border); border-radius: 14px; background: var(--card);
  box-shadow: var(--shadow); transition: transform .12s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0,0,0,.08); }
.card:focus-within { outline: 2px solid color-mix(in hsl, var(--primary) 55%, transparent); }
.card-menu { position: absolute; top: 8px; right: 8px; opacity: .6; }
.card-link { display: grid; grid-template-columns: 40px 1fr; gap: 10px; padding: 16px; color: inherit; text-decoration: none; }
.favicon-wrap { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; background: #fff; overflow: hidden; border: 1px solid var(--card-border); font-weight: 700; color: var(--primary); }
.favicon { display: none; }
.card-title { margin: 0; font-size: 15px; font-weight: 700; }
.card-desc { margin: 6px 0 10px; font-size: 12px; color: var(--muted); height: 32px; overflow: hidden; }
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.card-tags .tag { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: color-mix(in hsl, var(--primary) 10%, var(--card)); color: var(--muted); border: 1px solid var(--card-border); }

/* Dialog */
.dialog::backdrop { background: rgba(0,0,0,.35); }
.dialog { border: 1px solid var(--card-border); border-radius: 16px; padding: 0; width: min(680px, 96vw); background: var(--bg); color: var(--fg); }
.dialog-header { padding: 16px 18px; border-bottom: 1px solid var(--card-border); }
.form { margin: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 16px 18px; }
.form-grid label { display: grid; gap: 6px; font-size: 12px; color: var(--muted); }
.form-grid input { padding: 10px 12px; border: 1px solid var(--card-border); border-radius: 10px; background: var(--card); color: var(--fg); }
.dialog-actions { display: flex; gap: 10px; justify-content: flex-end; padding: 14px 18px; border-top: 1px solid var(--card-border); }

/* Toast */
.toast { position: fixed; inset-inline: 0; bottom: 18px; margin: auto; width: fit-content; max-width: 92vw; background: var(--fg); color: var(--bg); padding: 10px 12px; border-radius: 10px; opacity: 0; transform: translateY(10px); transition: .2s; }
.toast.show { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 720px) {
  .search input { width: 52vw; }
  .form-grid { grid-template-columns: 1fr; }
}

/* System theme respect */
@media (prefers-color-scheme: dark) {
  :root:not(.light) { color-scheme: dark; }
}