:root {
  --color-bg-start: #0f172a;
  --color-bg-end: #1e293b;
  --color-card: rgba(255, 255, 255, 0.04);
  --color-card-border: rgba(255, 255, 255, 0.08);
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-text-dim: #64748b;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --radius-lg: 16px;
  --radius-md: 10px;
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.4);
  --shadow-btn: 0 4px 14px rgba(59, 130, 246, 0.4);
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.15), transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.12), transparent 40%);
  pointer-events: none;
  z-index: 0;
}

.container {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 460px;
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
  animation: fadeInUp 0.6s ease-out;
}

.badge {
  display: inline-block;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 999px;
  margin-bottom: 28px;
}

h1 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 36px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 600;
  color: white;
  text-decoration: none;
  background: var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-btn);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary .arrow {
  transition: transform 0.2s ease;
}

.btn-primary:hover .arrow {
  transform: translateX(4px);
}

.hint {
  margin-top: 20px;
  font-size: 13px;
  color: var(--color-text-dim);
}

.footer {
  margin-top: 40px;
  font-size: 12px;
  color: var(--color-text-dim);
  text-align: center;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 520px) {
  .card {
    padding: 36px 24px;
  }

  h1 {
    font-size: 28px;
  }

  .tagline {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card {
    animation: none;
  }

  .btn-primary,
  .btn-primary .arrow {
    transition: none;
  }
}