:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1c2330;
  --muted: #5a6475;
  --accent: #002eff;
  --accent-hover: #0024c7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151c;
    --card: #1a202b;
    --text: #e8ecf3;
    --muted: #a3adbd;
    --accent: #4d6bff;
    --accent-hover: #6a84ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  max-width: 520px;
  width: 100%;
  padding: 40px 32px;
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  text-align: center;
}

h1 { margin: 0 0 16px; font-size: 1.6rem; }
p { margin: 0 0 16px; color: var(--muted); line-height: 1.5; }
.countdown { color: var(--text); }

.button {
  display: inline-block;
  margin-top: 8px;
  padding: 14px 28px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
}

.button:hover, .button:focus-visible { background: var(--accent-hover); }