:root {
  color-scheme: light dark;
  --bg: #f4f6fb;
  --fg: #1a1d29;
  --muted: #5b6472;
  --card: #ffffff;
  --accent: #3b5bdb;
  --border: #e2e6ef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141c;
    --fg: #eef1f7;
    --muted: #9aa3b2;
    --card: #1b1e29;
    --accent: #748ffc;
    --border: #2a2e3d;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 2rem 1.25rem;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.card {
  max-width: 40rem;
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  box-shadow: 0 12px 40px rgba(20, 24, 40, 0.08);
  text-align: center;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  color: var(--accent);
}

.welcome {
  margin: 0;
  font-size: 1.05rem;
  color: var(--fg);
}

footer {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}