/* ============================================================
 *  char.iacgn.com 共用样式
 *  index / 404 / 健康检查 三个页面共用
 *  纯黑白，无渐变、无光斑、无毛玻璃、无动画
 * ============================================================ */

:root {
  --bg: #ffffff;
  --fg: #111111;
  --dim: #6b6b6b;
  --line: #e6e6e6;
  --solid-bg: #111111;
  --solid-fg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d0d;
    --fg: #f0f0f0;
    --dim: #9a9a9a;
    --line: #262626;
    --solid-bg: #f0f0f0;
    --solid-fg: #0d0d0d;
  }
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 22px;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

.card {
  width: 100%;
  max-width: 460px;
}

/* ---------- 头部 ---------- */
.head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 6px;
}

h1 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .01em;
  margin: 0;
  line-height: 1.4;
}

.sub {
  font-size: 13px;
  color: var(--dim);
  margin: 0 0 28px;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}

/* ---------- 信息行 ---------- */
.rows {
  border-top: 1px solid var(--line);
}

.row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
}

.row .k {
  color: var(--dim);
  flex: none;
  font-size: 13px;
}

.row .v {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  text-align: right;
  word-break: break-all;
  min-width: 0;
}

.row .v.wrap {
  font-family: inherit;
  font-size: 13.5px;
  line-height: 1.65;
}

/* ---------- 徽标 ---------- */
.pill {
  display: inline-block;
  padding: 0 7px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 11px;
  line-height: 18px;
  color: var(--dim);
  white-space: nowrap;
  vertical-align: 1px;
}

/* ---------- 按钮 ---------- */
.actions {
  display: flex;
  gap: 10px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.btn {
  flex: 1;
  min-width: 132px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 8px;
  border: 1px solid var(--fg);
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: opacity .15s, transform .12s ease;
  -webkit-tap-highlight-color: transparent;
}

/* 按压反馈：松手自动回弹 */
.btn:active {
  opacity: .85;
  transform: scale(.97);
}

/* hover 只在真有鼠标的设备上生效。
   手机浏览器点完会一直保持 hover 状态，导致按钮看起来"没回弹"。 */
@media (hover: hover) and (pointer: fine) {
  .btn:hover { opacity: .75; }
}

.btn.pri {
  background: var(--solid-bg);
  color: var(--solid-fg);
  border-color: var(--solid-bg);
}

.btn svg { width: 15px; height: 15px; flex: none; }

/* ---------- 底部说明 ---------- */
.foot {
  margin-top: 30px;
  font-size: 11.5px;
  color: var(--dim);
  text-align: center;
}

.foot code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
}

/* ---------- 404 专用 ---------- */
.center-text { text-align: center; }

.icon {
  width: 42px;
  height: 42px;
  margin: 0 auto 18px;
  color: var(--fg);
  opacity: .85;
}

.code {
  font-size: 76px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  margin: 0 0 10px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.center-text h1 { margin: 0 0 8px; font-size: 17px; }

.center-text .sub {
  max-width: 320px;
  margin: 0 auto;
}

@media (max-width: 420px) {
  .actions .btn { min-width: 0; }
  .row { gap: 12px; }
}