:root {
  --main-bg: #333;
  --main-text: #fff;
  --btn-bg: #555;
  --btn-hover: #777;
  --gallery-bg: #f4f4f4;
  --border-color: #ddd;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --hover-shadow-color: rgba(0, 0, 0, 0.3);
  --accent-color: #ff5722;
  --overlay-color: rgba(0, 0, 0, 0.7);
  --highlight-color: #ffc107;
  --secondary-text: #666;
}

body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(180deg, #e8e8e8, #fefefe);
  color: #333;
  line-height: 1.6;
  overflow-x: hidden;
}

header {
  background: linear-gradient(135deg, var(--accent-color) 50%, #444);
  color: var(--main-text);
  padding: 3em 1em;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 10px var(--shadow-color);
}

header h1 {
  font-size: 3em;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 5px;
  position: relative;
  z-index: 1;
  animation: fadeIn 1.5s ease-in-out, textGlow 2s infinite alternate;
}

header::before,
header::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--highlight-color), transparent 60%);
  transform: translate(-50%, -50%) scale(1);
  z-index: 0;
  opacity: 0.1;
  animation: rotateGlow 15s linear infinite;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes rotateGlow {
  0% {
    transform: translate(-50%, -50%) scale(1) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) scale(1) rotate(360deg);
  }
}

@keyframes textGlow {
  from {
    text-shadow: 0 0 10px var(--highlight-color), 0 0 20px var(--accent-color);
  }
  to {
    text-shadow: 0 0 20px var(--highlight-color), 0 0 40px var(--accent-color);
  }
}

#filters {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin: 2em auto;
  padding: 1em;
  background: var(--gallery-bg);
  border-radius: 12px;
  box-shadow: 0 4px 10px var(--shadow-color);
  animation: slideIn 1s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#filters select,
#filters button {
  padding: 15px 25px;
  font-size: 1.2em;
  border: 2px solid var(--border-color);
  border-radius: 30px;
  cursor: pointer;
  transition: all 0.3s ease;
  background: white;
  box-shadow: 0 4px 6px var(--shadow-color);
}

#filters button {
  background: var(--btn-bg);
  color: var(--main-text);
}

#filters select:hover,
#filters button:hover {
  background: var(--btn-hover);
  color: #fff;
  transform: scale(1.1) rotate(2deg);
  box-shadow: 0 6px 12px var(--hover-shadow-color);
}

#gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  padding: 30px;
  background: linear-gradient(to bottom, #fff, var(--gallery-bg));
  border-top: 5px solid var(--accent-color);
  border-bottom: 5px solid var(--accent-color);
  animation: fadeIn 1.5s ease-in-out;
}

#gallery .image-item {
  position: relative;
  border: 3px solid var(--border-color);
  border-radius: 15px;
  overflow: hidden;
  background: white;
  transition: transform 0.4s, box-shadow 0.4s;
  box-shadow: 0 6px 10px var(--shadow-color);
}

#gallery .image-item:hover {
  transform: translateY(-10px) scale(1.05);
  box-shadow: 0 12px 20px var(--hover-shadow-color);
  background: var(--accent-color);
}

#gallery .image-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s ease, filter 0.6s ease;
  border-radius: 12px 12px 0 0;
}

#gallery .image-item:hover img {
  transform: scale(1.2);
  filter: brightness(1.3) contrast(1.2);
}

#gallery .image-item p {
  margin: 0;
  padding: 15px;
  font-size: 1.1em;
  font-weight: bold;
  text-align: center;
  color: var(--secondary-text);
  transition: color 0.3s ease;
}

#gallery .image-item:hover p {
  color: white;
}

#gallery .image-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--overlay-color);
  opacity: 0;
  transition: opacity 0.4s ease;
  z-index: 1;
}

#gallery .image-item:hover::before {
  opacity: 1;
}

#gallery .image-item p {
  position: relative;
  z-index: 2;
}

/* Loader animé */
#gallery p {
  text-align: center;
  font-size: 1.5em;
  color: var(--btn-bg);
  animation: blink 1.5s infinite;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@media (max-width: 768px) {
  #filters {
    flex-direction: column;
    gap: 15px;
  }

  #gallery {
    grid-template-columns: 1fr;
  }

  #gallery .image-item {
    width: 90%;
    margin: 0 auto;
  }
}