:root {
  --bg-1: #071426;
  --bg-2: #102b45;
  --accent: #22d3ee;
  --text: #f4f8ff;
  --muted: #b7c4d9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 20%, #1f4f7d 0%, transparent 40%),
    radial-gradient(circle at 80% 30%, #0f7ca8 0%, transparent 35%),
    linear-gradient(160deg, var(--bg-1), var(--bg-2));
  min-height: 100vh;
}

.hero {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(640px, 100%);
  background: rgba(8, 20, 34, 0.75);
  border: 1px solid rgba(143, 181, 230, 0.3);
  border-radius: 18px;
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(6px);
}

.label {
  margin: 0;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--accent);
}

h1 {
  margin: 12px 0 8px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.1;
}

.subtitle {
  margin: 0 auto 24px;
  max-width: 44ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  color: #062034;
  background: linear-gradient(120deg, #67e8f9, #22d3ee);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.35);
}