:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #6366f1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border-radius: 20px;
  padding: 32px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.logo {
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-transform: uppercase;
  font-size: 14px;
  margin-bottom: 16px;
}

h1 {
  font-size: 24px;
  margin: 0 0 8px;
}

.sub {
  color: var(--muted);
  margin: 0 0 24px;
}

.cta {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn {
  display: block;
  padding: 14px 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

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

.hint {
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
}

.loading {
  color: var(--muted);
}