:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --card: #1a1d24;
  --text: #f4f5f7;
  --muted: #a8b0bd;
  --accent: #f5c542;
  --accent-ink: #1a1400;
  --border: #2c3340;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f1ec;
    --card: #ffffff;
    --text: #16181d;
    --muted: #5c6570;
    --accent: #e0a800;
    --accent-ink: #1a1400;
    --border: #d7dbe2;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at top, rgba(245, 197, 66, 0.18), transparent 45%),
    var(--bg);
  color: var(--text);
}

.card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  text-align: center;
}

.brand {
  margin: 0 0 8px;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0 0 12px;
  font-size: 1.6rem;
  line-height: 1.2;
}

.detail {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.45;
}

.btn {
  display: block;
  width: 100%;
  margin: 0 0 10px;
  padding: 14px 16px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
}

.btn.primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.fallback {
  margin: 16px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
  word-break: break-word;
}