:root {
  --bg: #0d1117;
  --bg-grad: radial-gradient(1200px 600px at 50% -10%, #1b2230 0%, #0d1117 55%);
  --card: #161b22;
  --border: #232a33;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  background-image: var(--bg-grad);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  -webkit-font-smoothing: antialiased;
}

.card {
  width: 100%;
  max-width: 460px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.badge {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 1px;
  color: #fff;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
}

h1 {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 14px auto 0;
  max-width: 360px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.links {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.links a {
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  background: #1c2330;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.links a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

footer {
  margin-top: 36px;
  color: var(--muted);
  font-size: 13px;
}