body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-muted);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border-subtle) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.35;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(
    ellipse at center,
    black 20%,
    transparent 70%
  );
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(
    ellipse at center,
    rgba(10, 111, 135, 0.08) 0%,
    transparent 60%
  );
  pointer-events: none;
}

.repair-visual {
  width: 240px;
  height: 240px;
  margin: 0 auto 1.5rem;
}

@media (min-width: 768px) {
  .repair-visual {
    width: 300px;
    height: 300px;
  }
}

.error-code {
  font-family: var(--font-serif);
  font-size: clamp(4.5rem, 12vw, 7rem);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.error-code span {
  color: var(--accent-tech);
}

h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1rem;
}

p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  background: var(--accent-btn);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 6px;
  text-decoration: none;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    filter 0.2s ease;
  box-shadow: 0 4px 18px rgba(10, 111, 135, 0.3);
}

.btn:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(10, 111, 135, 0.45);
  color: #fff;
}

.btn:focus-visible {
  outline: 3px solid var(--accent-link-hover);
  outline-offset: 3px;
}

.vernier span {
  color: var(--accent-tech);
  opacity: 0.5;
}