/* --- Variabel Warna & Gaya Global --- */
:root {
  --primary-color: #3b82f6; /* Biru INSIDER */
  --bg-color: #f3f4f6;
  --card-bg-color: #ffffff;
  --text-color: #1f2937;
  --subtle-text-color: #6b7280;
  --border-color: #e5e7eb;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --font-family: "Poppins", sans-serif;
}

body.dark-mode {
  --bg-color: #111827;
  --card-bg-color: #1f2937;
  --text-color: #f9fafb;
  --subtle-text-color: #9ca3af;
  --border-color: #374151;
  --shadow-color: rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

/* --- Layout Utama & Header --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

/* --- Galeri --- */
.gallery-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--shadow-color);
  cursor: pointer;
}

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

.gallery-item:hover img {
  transform: scale(1.1);
}

.item-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: white;
  padding: 2rem 1.5rem 1.5rem;
  transform: translateY(100%);
  transition: transform 0.4s ease;
}

.gallery-item:hover .item-info {
  transform: translateY(0);
}

.item-info h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.item-info p {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* --- Lightbox --- */
.lightbox {
  display: none; /* Tersembunyi secara default */
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  justify-content: center;
  align-items: center;
  animation: fadeIn 0.3s;
}

.lightbox.active {
  display: flex;
}

.lightbox-content {
  max-width: 90%;
  max-height: 80%;
  animation: zoomIn 0.3s;
}

.close-button {
  position: absolute;
  top: 20px;
  right: 35px;
  color: #fff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.2s;
}

.close-button:hover {
  color: #ccc;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes zoomIn {
  from {
    transform: scale(0.8);
  }
  to {
    transform: scale(1);
  }
}

/* --- Footer --- */
.page-footer {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--subtle-text-color);
}

/* --- Dark Mode Toggle Switch --- */
.controls {
  display: flex;
  align-items: center;
}
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.controls {
  gap: 1rem;
}
.back-button {
  background-color: var(--primary-color);
  color: white;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background-color 0.2s, transform 0.2s;
}
.back-button:hover {
  background-color: #2563eb; /* Warna biru sedikit lebih gelap */
  transform: translateY(-2px);
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 28px;
}
.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}
input:checked + .slider {
  background-color: var(--primary-color);
}
input:checked + .slider:before {
  transform: translateX(22px);
}