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

:root {
  --bg: #f8f9ff;
  --surface-low: #eff4ff;
  --surface-highest: #d3e4ff;
  --on-surface: #0c335a;
  --on-surface-muted: #40618a;
  --outline-variant: #94b4e2;
}

html { font-size: 18px; }

body {
  background: var(--bg);
  color: var(--on-surface);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
}

.error-container {
  max-width: 480px;
}

.hex {
  font-size: 3rem;
  display: block;
  margin-bottom: 1.5rem;
  opacity: 0.6;
}

h1 {
  font-family: 'Space Grotesk', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--on-surface-muted);
  margin-bottom: 1rem;
}

p {
  font-size: 1rem;
  color: var(--on-surface);
  margin-bottom: 1.5rem;
}

.path {
  font-family: 'Space Grotesk', monospace;
  font-size: 0.85rem;
  color: var(--on-surface-muted);
  background: var(--surface-low);
  padding: 0.4rem 0.8rem;
  margin-bottom: 1rem;
  display: inline-block;
}

a {
  color: var(--on-surface);
  text-decoration: none;
  border-bottom: 1px solid var(--outline-variant);
  transition: opacity 0.1s ease-in-out;
}

a:hover { opacity: 0.6; }

.btn {
  display: inline-block;
  font-family: 'Space Grotesk', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--on-surface);
  background: var(--surface-highest);
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--outline-variant);
  margin: 0.25rem;
  transition: background-color 0.15s ease;
}

.btn:hover {
  background: var(--surface-low);
  opacity: 1;
  border-bottom: 1px solid var(--outline-variant);
}

.back-link {
  margin-top: 2rem;
  font-size: 0.85rem;
  color: var(--on-surface-muted);
}