:root {
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-color: #212529;
  --border-color: #e9ecef;
  --primary-color: #0d6efd;
  --badge-bg: #e7f1ff;
  --badge-text: #0c63e4;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
  --bg-color: #121212;
  --card-bg: #1e1e1e;
  --text-color: #f8f9fa;
  --border-color: #2d2d2d;
  --primary-color: #0d6efd;
  --badge-bg: #1c2a38;
  --badge-text: #6ea8fe;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.7);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
  padding-bottom: 3rem;
}

/* Header & Theme Toggle */
.header {
  padding: 2rem 1rem 1rem;
  text-align: center;
  position: relative;
}

.top-bar {
  display: flex;
  justify-content: flex-end;
  max-width: 1200px;
  margin: 0 auto;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.theme-toggle:hover {
  background-color: var(--border-color);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Search Bar */
.search-container {
  margin: 1.5rem 0;
  display: flex;
  justify-content: center;
}

.search-container input {
  width: 100%;
  max-width: 500px;
  padding: 0.75rem 1.25rem;
  border-radius: 25px;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg);
  color: var(--text-color);
  font-size: 1rem;
  outline: none;
  box-shadow: var(--shadow);
}

.search-container input:focus {
  border-color: var(--primary-color);
}

/* Filter Navigation */
.filter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background-color: var(--card-bg);
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--primary-color);
  color: #ffffff;
  border-color: var(--primary-color);
}

/* Gallery Grid */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card.hidden {
  display: none !important;
}

.card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background-color: var(--border-color);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-content {
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.badge {
  background-color: var(--badge-bg);
  color: var(--badge-text);
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: capitalize;
}

#no-results {
  text-align: center;
  padding: 3rem 0;
  font-size: 1.1rem;
  color: var(--text-color);
  opacity: 0.7;
}

.hidden {
  display: none !important;
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.lightbox img {
  max-width: 90%;
  max-height: 80vh;
  border-radius: 8px;
  object-fit: contain;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.lightbox-caption {
  color: #ffffff;
  margin-top: 1rem;
  font-size: 1.1rem;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 25px;
  color: #ffffff;
  font-size: 2.5rem;
  background: none;
  border: none;
  cursor: pointer;
  line-height: 1;
}