:root {
  --404-text-color: #fff;
  --404-accent: #e4002b;
}

.page-404 {
  position: relative;
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: var(--404-text-color);
}

.page-404__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(2px);
}

.page-404__content {
  position: relative;
  padding: 3rem 2.5rem 3.5rem;
  text-align: center;
  animation: fade-in .7s ease;
}

.page-404__content h1 {
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: .03em;
  margin-bottom: 1.25rem;
}

.page-404__text {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  margin-bottom: 2.2rem;
  opacity: .9;
}

.page-404__btn {
  display: inline-block;
  background: #fff;
  color: black  !important;
  text-decoration: none;
  padding: 1rem 2.2rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .06em;
  border-radius: 0;
  box-shadow: 0 4px 12px -4px rgba(0,0,0,.35), 0 2px 4px -2px rgba(0,0,0,.4);
  transition: background .25s, color .25s, transform .25s, box-shadow .25s;
}
.page-404__btn:hover {
  background: #000;
  color: #fff  !important;
  transform: translateY(-3px);
  box-shadow: 0 12px 28px -6px rgba(0,0,0,.6), 0 6px 10px -4px rgba(0,0,0,.4);
}
.page-404__btn:active {
  background: #000;
  color: #fff;
  transform: translateY(0);
  box-shadow: 0 6px 14px -4px rgba(0,0,0,.55), 0 3px 6px -2px rgba(0,0,0,.4);
}

@keyframes fade-in { from { opacity: 0; transform: translateY(15px);} to { opacity:1; transform: translateY(0);} }

/* Small screens */
@media (max-width: 480px) {
  .page-404__content { padding: 2.5rem 1.5rem 3rem; }
  .page-404__btn { width: 100%; }
}