:root {
  --bg-dark: #020617;
  --card-bg: #0f172a;
  --border-soft: rgba(255,255,255,0.08);

  --primary: #38bdf8;
  --primary-dark: #0284c7;

  --gradient-main: linear-gradient(
    135deg,
    #38bdf8,
    #6366f1
  );

  --text-main: #e5e7eb;
  --text-muted: #94a3b8;
}

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

body {
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial;
  background:
    radial-gradient(circle at top, #0f172a, #020617 65%);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Main card */
.card {
  width: 100%;
  max-width: 390px;
  background: var(--card-bg);
  border-radius: 18px;
  padding: 28px;
  border: 1px solid var(--border-soft);
  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
  animation: fadeUp 0.6s ease;
}

/* Titles */
h1, h2 {
  font-weight: 600;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Button */
.btn {
  margin-top: 22px;
  width: 100%;
  padding: 14px;
  border-radius: 14px;
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  background: var(--gradient-main);
  color: #020617;
  transition: transform .2s ease, box-shadow .2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 30px rgba(56,189,248,.35);
}

/* Footer note */
.note {
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

/* Animations */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}