:root,
:root[data-theme="light"] {
  --bg: #f5f7fb;
  --card: #fff;
  --fg: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #2563eb;
  --ok: #16a34a;
  --warn: #d97706;
  --err: #dc2626;
  --btn-bg: #fff;
  color-scheme: light;
}

/* 跟随系统：只在没有手动选 light/dark 时生效 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg: #0b1220;
    --card: #111a2e;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --line: #1f2a44;
    --brand: #60a5fa;
    --ok: #4ade80;
    --warn: #fbbf24;
    --err: #f87171;
    --btn-bg: #16223a;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --card: #111a2e;
  --fg: #e2e8f0;
  --muted: #94a3b8;
  --line: #1f2a44;
  --brand: #60a5fa;
  --ok: #4ade80;
  --warn: #fbbf24;
  --err: #f87171;
  --btn-bg: #16223a;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  transition: background-color .18s ease, color .18s ease;
}

main { max-width: 960px; margin: 0 auto; padding: 48px 20px 32px; }

.head-top { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
header h1 { margin: 0; font-size: 28px; letter-spacing: .5px; }
.sub { margin: 6px 0 28px; color: var(--muted); }
.controls { margin-left: auto; display: flex; gap: 8px; }

.ctl {
  border: 1px solid var(--line);
  background: var(--btn-bg);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 13px;
  line-height: 1.4;
  cursor: pointer;
  white-space: nowrap;
  transition: color .15s ease, border-color .15s ease;
}
.ctl:hover { color: var(--brand); border-color: var(--brand); }
.ctl:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
  min-height: 220px;
  transition: background-color .18s ease, border-color .18s ease;
}

.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.tag {
  font-weight: 600;
  font-size: 13px;
  padding: 2px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--brand) 14%, transparent);
  color: var(--brand);
}
.state { font-size: 13px; color: var(--muted); }
.state[data-state="ok"] { color: var(--ok); }
.state[data-state="hidden"] { color: var(--warn); }
.state[data-state="err"] { color: var(--err); }
.state[data-state="ok"]::before,
.state[data-state="hidden"]::before,
.state[data-state="err"]::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  margin-right: 6px;
  vertical-align: 1px;
}

.ip { display: flex; align-items: center; gap: 10px; min-height: 36px; margin-bottom: 14px; }
.ip-text {
  font: 600 22px/1.3 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  word-break: break-all;
}
.card.none .ip-text,
.card.hidden .ip-text,
.card.err .ip-text {
  font-family: inherit;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--muted);
}

.copy, #recheck {
  border: 1px solid var(--line);
  background: var(--btn-bg);
  color: var(--fg);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 13px;
  cursor: pointer;
}
.copy:hover, #recheck:hover { border-color: var(--brand); color: var(--brand); }

.meta { display: grid; grid-template-columns: 76px 1fr; gap: 6px 12px; margin: 0; font-size: 14px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; word-break: break-all; }
.meta dd.warn { color: var(--warn); }

.pref { margin: 20px 2px 0; color: var(--muted); font-size: 14px; }
#pref-value { color: var(--fg); font-weight: 600; }

footer { margin-top: 28px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.note { color: var(--muted); font-size: 12px; }

@media (max-width: 480px) {
  main { padding-top: 28px; }
  header h1 { font-size: 22px; }
  .meta { grid-template-columns: 68px 1fr; }
}