/* Bootsy Cat Gallery — brighter, clean, modern */

* { box-sizing: border-box; }

:root {
  color-scheme: dark;
  --bg1: #2b2f36;
  --bg2: #111317;
  --card: rgba(255,255,255,0.06);
  --card2: rgba(255,255,255,0.10);
  --border: rgba(255,255,255,0.14);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.72);
  --muted2: rgba(255,255,255,0.58);
  --shadow: rgba(0,0,0,0.55);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 520px at 18% 8%, rgba(140,255,200,0.18), transparent 60%),
    radial-gradient(820px 460px at 82% 18%, rgba(160,180,255,0.18), transparent 62%),
    radial-gradient(760px 420px at 50% 92%, rgba(255,180,220,0.14), transparent 65%),
    radial-gradient(circle at top, var(--bg1), var(--bg2));
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Header */
header {
  text-align: center;
  padding: 42px 18px 18px;
}

header h1 {
  margin: 0;
  font-size: clamp(2rem, 3.2vw, 2.8rem);
  letter-spacing: 0.3px;
}

header p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

header .meta {
  margin-top: 12px;
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--muted2);
  font-size: 0.88rem;
  backdrop-filter: blur(10px);
}

/* Gallery */
.gallery {
  width: min(1150px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  padding: 14px;
}

/* Tile button wrapper */
.tile {
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 16px;
  outline: none;
  position: relative;
}

/* Image */
.tile img {
  width: 100%;
  height: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
  filter: brightness(1.12) contrast(1.06) saturate(1.05);
  transform: translateZ(0);
  transition: transform 180ms ease, box-shadow 180ms ease, filter 180ms ease, border-color 180ms ease;
}

/* Hover / focus */
.tile:hover img,
.tile:focus-visible img {
  transform: translateY(-4px) scale(1.02);
  border-color: rgba(255,255,255,0.22);
  box-shadow: 0 26px 60px rgba(0,0,0,0.45);
  filter: brightness(1.18) contrast(1.08) saturate(1.10);
}

.tile:focus-visible {
  box-shadow: 0 0 0 3px rgba(160,180,255,0.28);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(900px 520px at 20% 10%, rgba(140,255,200,0.10), transparent 60%),
    radial-gradient(820px 460px at 80% 20%, rgba(160,180,255,0.10), transparent 62%),
    rgba(0,0,0,0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
  z-index: 1000;
}

.lightbox.show {
  opacity: 1;
  pointer-events: all;
}

.lightbox img {
  max-width: min(95vw, 1200px);
  max-height: 90vh;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: 0 30px 90px rgba(0,0,0,0.75);
}

/* Lightbox controls */
.lb-close,
.lb-nav {
  position: absolute;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.92);
  cursor: pointer;
  border-radius: 14px;
  backdrop-filter: blur(10px);
  transition: transform 140ms ease, background 140ms ease, opacity 140ms ease, border-color 140ms ease;
}

.lb-close:hover,
.lb-nav:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.24);
  transform: translateY(-1px);
}

.lb-close:active,
.lb-nav:active {
  transform: translateY(0px);
}

.lb-close {
  top: 18px;
  right: 18px;
  width: 44px;
  height: 44px;
  font-size: 20px;
}

.lb-nav {
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  font-size: 34px;
  line-height: 0;
  opacity: 0.85;
}

.lb-prev { left: 16px; }
.lb-next { right: 16px; }

.lb-hint {
  position: absolute;
  bottom: 18px;
  width: 100%;
  text-align: center;
  color: rgba(255,255,255,0.55);
  font-size: 0.84rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 30px 0 34px;
  font-size: 0.92rem;
  color: rgba(255,255,255,0.62);
}

/* Prevent scroll when lightbox open */
.no-scroll { overflow: hidden; }

/* Mobile tweaks */
@media (max-width: 600px) {
  header { padding-top: 34px; }
  .gallery { gap: 10px; padding: 10px; }
  .tile img { border-radius: 14px; }
  .lb-nav { width: 46px; height: 46px; font-size: 30px; }
  .lb-close { width: 42px; height: 42px; }
}