:root {
  color-scheme: dark;
  --bg: #0b0a12;
  --surface: rgba(255, 255, 255, 0.05);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f3f1ff;
  --muted: #a29cb9;
  --accent: #8a6bff;
  --accent-2: #4fd8e8;
  --warn: #ff9f8b;
  --radius: 16px;
}
html[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f5fb;
  --surface: #ffffff;
  --line: rgba(22, 14, 48, 0.12);
  --text: #1a1530;
  --muted: #6a6584;
  --accent: #6b4bf0;
  --accent-2: #0ea2b4;
  --warn: #c2410c;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); }
body {
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  padding: 14px;
  background:
    radial-gradient(560px 300px at 8% -10%, color-mix(in srgb, var(--accent) 24%, transparent), transparent 72%),
    radial-gradient(480px 280px at 100% 0%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 70%),
    var(--bg);
}

.stage {
  max-width: 460px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.stage.wide { max-width: 680px; }

.head { display: flex; align-items: center; gap: 8px; }
.dot {
  width: 8px; height: 8px; border-radius: 50%; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 80%, transparent);
}
h1 {
  margin: 0; font-size: 16px; font-weight: 650; letter-spacing: -0.01em;
  flex: 1; min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.status {
  font-size: 11.5px; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 3px 9px; white-space: nowrap;
}
.status.error { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 45%, transparent); }

.lede { margin: 0; font-size: 13px; line-height: 1.7; color: var(--muted); }

.flip {
  perspective: 1000px;
  width: 100%;
  height: 168px;
  border-radius: var(--radius);
}
.flip.large { height: 236px; }

.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.3, 0.8, 0.3, 1);
}
.flip.is-open .flip-inner { transform: rotateY(180deg); }

.face {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.front {
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.045) 0 10px, transparent 10px 20px),
    linear-gradient(160deg, color-mix(in srgb, var(--accent) 34%, var(--bg)), color-mix(in srgb, var(--accent-2) 20%, var(--bg)));
}
.mark {
  font-size: 44px;
  font-weight: 700;
  color: color-mix(in srgb, var(--text) 78%, transparent);
  text-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  line-height: 1;
}
.front-tip { font-size: 12px; color: color-mix(in srgb, var(--text) 62%, transparent); }

.back {
  transform: rotateY(180deg);
  background:
    radial-gradient(120% 120% at 20% 0%, rgba(255, 255, 255, 0.34), transparent 62%),
    var(--tone, #888);
  color: #fff;
  text-shadow: 0 1px 18px rgba(0, 0, 0, 0.35);
}
.color-name { font-size: 30px; font-weight: 700; letter-spacing: 0.02em; }
.color-hex { font-size: 12.5px; font-family: ui-monospace, "SF Mono", Menlo, monospace; opacity: 0.9; }

.actions { display: flex; gap: 8px; }
.btn {
  appearance: none;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  border-radius: 11px;
  padding: 11px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  flex: 1;
  color: #0a0616;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  transition: transform 0.14s ease, opacity 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.ghost {
  flex: none;
  color: var(--muted);
  background: transparent;
  border-color: var(--line);
}
.btn.ghost:hover { color: var(--text); border-color: color-mix(in srgb, var(--text) 26%, transparent); }

.hint {
  margin: 0;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--muted);
  text-align: center;
  min-height: 16px;
}

.meta {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.meta h2 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.meta dl { margin: 0; display: grid; gap: 8px; }
.meta dl > div { display: grid; grid-template-columns: 84px 1fr; gap: 10px; font-size: 12.5px; line-height: 1.6; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; color: color-mix(in srgb, var(--text) 90%, var(--muted)); }

@media (max-width: 420px) {
  body { padding: 10px; }
  .flip { height: 148px; }
  .flip.large { height: 200px; }
  .color-name { font-size: 26px; }
  .meta dl > div { grid-template-columns: 1fr; gap: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  .flip-inner { transition-duration: 0.01s; }
}