/* ============================================================
   404 ERROR PAGE
   ============================================================ */
.error-page {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-16) var(--space-8);
  background: var(--color-space);
  position: relative;
  overflow: hidden;
}

.error-page::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 40% 50%, hsla(220, 50%, 18%, 0.4), transparent),
    radial-gradient(ellipse 400px 300px at 65% 60%, hsla(268, 50%, 20%, 0.15), transparent);
  pointer-events: none;
}

.error-content {
  position: relative;
  z-index: 2;
  max-width: 500px;
}

.error-code {
  font-family: var(--font-heading);
  font-size: 140px;
  font-weight: var(--weight-heavy);
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(255,255,255,0.05);
  margin-bottom: var(--space-2);
}

.error-icon {
  font-size: 48px;
  color: var(--color-red);
  margin-bottom: var(--space-6);
  opacity: 0.9;
}

.error-title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--color-white);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}

.error-desc {
  font-size: var(--text-md);
  color: rgba(255,255,255,0.5);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-10);
}

.error-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}

.error-popular {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.error-popular-label {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: var(--weight-demi);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: rgba(255,255,255,0.25);
  margin-bottom: var(--space-5);
}

.error-popular-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.error-popular-links a {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: rgba(255,255,255,0.45);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid rgba(255,255,255,0.08);
  transition: all var(--duration-fast) var(--ease-out);
}

.error-popular-links a:hover {
  color: var(--color-white);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.05);
}