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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(circle at top, #1e2230 0%, var(--bg) 55%);
  color: var(--text);
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header p {
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.grid-item {
  appearance: none;
  border: none;
  padding: 0;
  margin: 0;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4 / 3;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.grid-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
}

.grid-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.grid-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.lightbox[hidden] {
  display: none;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(4px);
}

.lightbox-dialog {
  position: relative;
  z-index: 1;
  width: min(900px, 100%);
  max-height: 90vh;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lightbox-content {
  margin: 0;
  flex: 1;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.lightbox-content img {
  display: block;
  width: 100%;
  max-height: 75vh;
  object-fit: contain;
  background: #000;
}

.lightbox-content figcaption {
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
  color: var(--muted);
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: -2.75rem;
  right: 0;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: var(--text);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.22);
}

.lightbox-nav {
  flex-shrink: 0;
  width: 2.75rem;
  height: 2.75rem;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: var(--text);
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease;
}

.lightbox-nav:hover {
  background: var(--accent);
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .lightbox-dialog {
    flex-direction: column;
  }

  .lightbox-nav {
    display: none;
  }

  .lightbox-close {
    top: 0.5rem;
    right: 0.5rem;
    z-index: 2;
  }
}