:root {
  color-scheme: dark;
  --bg-start: #0b1220;
  --bg-end: #08111f;
  --accent: #7dd3fc;
  --surface: rgba(22, 31, 52, 0.92);
  --surface-strong: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #162847 0%, transparent 45%),
    linear-gradient(180deg, var(--bg-start) 0%, var(--bg-end) 100%);
  color: var(--text-primary);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 35% 15%, rgba(125, 211, 252, 0.17), transparent 24%),
    radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.13), transparent 20%);
  pointer-events: none;
}

.page-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.content-card {
  max-width: 520px;
  width: 100%;
  padding: 3rem 2.5rem;
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  text-align: center;
  animation: floatIn 0.9s ease-out;
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 0.95;
}

.lead {
  margin: 1.5rem 0 0;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.85;
}

.footer-note {
  margin-top: 2rem;
  display: inline-flex;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: #dbeafe;
  font-size: 0.95rem;
}

@keyframes floatIn {
  from {
    transform: translateY(18px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 520px) {
  .content-card {
    padding: 2.5rem 1.5rem;
  }
}