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

/* ── Theme variables ── */

:root {
  --bg: #f5f4f2;
  --surface: #ffffff;
  --surface-hover: #f7f6f4;
  --text: #1c1c1c;
  --text-muted: #888;
  --media-bg: #e8e6e2;
  --card-border: rgba(0, 0, 0, 0.08);
  --card-shadow: rgba(0, 0, 0, 0.1);
  --toggle-bg: #ffffff;
  --toggle-border: rgba(0, 0, 0, 0.12);
  --toggle-shadow: rgba(0, 0, 0, 0.08);
  --radius: 10px;
}

html.dark {
  --bg: #0d0d0d;
  --surface: #1a1a1a;
  --surface-hover: #222;
  --text: #f0ede8;
  --text-muted: #777;
  --media-bg: #111;
  --card-border: transparent;
  --card-shadow: rgba(0, 0, 0, 0.55);
  --toggle-bg: #1e1e1e;
  --toggle-border: rgba(255, 255, 255, 0.1);
  --toggle-shadow: rgba(0, 0, 0, 0.4);
}

/* ── Base ── */

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
  line-height: 1.5;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* ── Theme toggle ── */

.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 100;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid var(--toggle-border);
  background: var(--toggle-bg);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px var(--toggle-shadow);
  transition: background-color 0.25s ease, border-color 0.25s ease,
              box-shadow 0.2s ease, transform 0.15s ease;
}

.theme-toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 3px 10px var(--toggle-shadow);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--text-muted);
  outline-offset: 2px;
}

.icon {
  width: 1.1rem;
  height: 1.1rem;
  display: block;
}

/* Light mode: show moon, hide sun */
.icon--sun  { display: none; }
.icon--moon { display: block; }

/* Dark mode: show sun, hide moon */
html.dark .icon--sun  { display: block; }
html.dark .icon--moon { display: none; }

/* ── Header ── */

.site-header {
  padding: 4rem 2rem 2rem;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.site-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 300;
  letter-spacing: 0.04em;
}

.site-description {
  margin-top: 0.6rem;
  color: var(--text-muted);
  font-size: 1rem;
}

/* ── Gallery grid ── */

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  padding: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.gallery__empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-muted);
  padding: 4rem 0;
}

/* ── Cards ── */

.card {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, border-color 0.25s ease,
              transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  background: var(--surface-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--card-shadow);
}

.card:focus-visible {
  outline: 2px solid var(--text-muted);
  outline-offset: 2px;
}

.card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--media-bg);
}

.card__media--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.card__image--missing {
  width: 100%;
  height: 100%;
}

.card:hover .card__image {
  transform: scale(1.04);
}

.card__placeholder-icon {
  width: 2rem;
  height: 2rem;
  color: var(--text-muted);
}

.card__body {
  padding: 0.9rem 1.1rem 1.1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.card__title {
  font-size: 0.975rem;
  font-weight: 600;
}

.card__description {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ── Unavailable card ── */

.card--unavailable {
  opacity: 0.45;
  cursor: default;
}

/* ── Responsive ── */

@media (max-width: 600px) {
  .gallery {
    grid-template-columns: 1fr;
    padding: 1rem;
    gap: 1rem;
  }

  .site-header {
    padding: 2.5rem 1.25rem 1.5rem;
  }
}

@media (min-width: 601px) and (max-width: 900px) {
  .gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}