:root {
  --bg: #0f1115;
  --bg-elevated: #161a21;
  --text: #e8eaed;
  --text-muted: #9aa3b2;
  --accent: #6ee7b7;
  --accent-strong: #34d399;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  --radius: 14px;
  --max-width: 1400px;
  --gap: 16px;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(
      1200px 600px at 10% -10%,
      rgba(110, 231, 183, 0.08),
      transparent 60%
    ),
    radial-gradient(
      1000px 500px at 100% 0%,
      rgba(99, 102, 241, 0.08),
      transparent 60%
    ),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Header */
.site-header {
  text-align: center;
  padding: clamp(32px, 6vw, 64px) 20px 24px;
}

.site-header h1 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-size: clamp(1.75rem, 4.5vw, 3rem);
}

.site-header .accent {
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.site-header .subtitle {
  margin: 12px auto 0;
  max-width: 540px;
  color: var(--text-muted);
  font-size: clamp(0.9rem, 2vw, 1rem);
  padding: 0 16px;
}

/* Main / grid */
main {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px clamp(16px, 4vw, 40px) 60px;
}

.img-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--gap);
}

.img-container a {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
  transform: translateY(8px);
  opacity: 0;
  animation: rise 0.5s ease forwards;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
  aspect-ratio: 1 / 1;
}

.img-container a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.img-container a::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    transparent 55%,
    rgba(0, 0, 0, 0.55) 100%
  );
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.img-container a:hover {
  transform: translateY(0) scale(1.015);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.55);
}

.img-container a:hover::after {
  opacity: 1;
}

.img-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease, filter 0.4s ease;
  filter: saturate(0.95);
}

.img-container a:hover img {
  transform: scale(1.06);
  filter: saturate(1.1);
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Loader */
.loader {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 32px 0 8px;
  min-height: 60px;
}

.loader.hidden {
  display: none;
}

.spinner {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.12);
  border-top-color: var(--accent-strong);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 24px 16px 40px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: border-color 0.2s ease;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  border-bottom-color: var(--accent);
}

/* Responsive tweaks */
@media (max-width: 900px) {
  .img-container {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
  }
}

@media (max-width: 600px) {
  main {
    padding: 16px 12px 40px;
  }

  .img-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .img-container a {
    border-radius: 10px;
  }
}

@media (max-width: 380px) {
  .img-container {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .img-container a,
  .img-container img,
  .spinner {
    animation: none !important;
    transition: none !important;
    opacity: 1;
    transform: none;
  }
}