:root {
  --bg: #0c111d;
  --bg-elevated: #141b2d;
  --border: rgba(148, 163, 184, 0.12);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-dim: rgba(56, 189, 248, 0.15);
  --radius: 12px;
  --shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.45);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 106.25%;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(56, 189, 248, 0.12), transparent),
    radial-gradient(ellipse 60% 50% at 100% 100%, rgba(99, 102, 241, 0.08), transparent);
}

.wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
}

.card {
  width: 100%;
  max-width: 28rem;
  padding: 2rem 2rem 1.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.65rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

p {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
  padding: 0.65rem 1.15rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: filter 0.15s ease, transform 0.15s ease;
}

.btn:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  text-decoration: none;
}

footer {
  margin-top: 2rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

.error-code {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
  opacity: 0.9;
}