/* CSS Variables */
:root {
  --primary-color: #4a90a4;
  --primary-dark: #357a8c;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --light-bg: #f8f9fa;
  --dark-bg: #343a40;
  --text-color: #333;
  --text-muted: #6c757d;
  --border-color: #dee2e6;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
  --radius: 8px;
  --radius-lg: 12px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-bg);
}

a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

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

/* Header */
.header {
  background: white;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: var(--text-color);
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav a:hover,
.nav a.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
  text-decoration: none;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin: 0 0 1rem;
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  margin: 0;
}

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.card-image {
  aspect-ratio: 16/10;
  background-color: #e9ecef;
  background-size: cover;
  background-position: center;
}

.card-body {
  padding: 1.25rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.card-text {
  color: var(--text-muted);
  margin: 0;
}

/* Grid */
.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 2rem 0;
}

/* Gallery Grid */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  padding: 1rem 0;
}

.gallery-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background-color: #e9ecef;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item .badge {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-official {
  background: var(--primary-color);
  color: white;
}

.badge-contribution {
  background: var(--success-color);
  color: white;
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.lightbox.active {
  display: flex;
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
}

.lightbox-content img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  transition: background 0.2s;
  z-index: 1001;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  transition: background 0.2s;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox-prev {
  left: 1rem;
}

.lightbox-next {
  right: 1rem;
}

.lightbox-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1rem;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  color: white;
}

.lightbox-info .contributor {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: white;
  text-decoration: none;
}

.btn-secondary {
  background: var(--secondary-color);
  color: white;
}

.btn-success {
  background: var(--success-color);
  color: white;
}

.btn-danger {
  background: var(--danger-color);
  color: white;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 144, 164, 0.2);
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  flex-wrap: wrap;
  align-items: center;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
}

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

/* Stats */
.stats {
  display: flex;
  gap: 2rem;
  padding: 1rem 0;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state h3 {
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

/* Footer */
.footer {
  background: var(--dark-bg);
  color: rgba(255, 255, 255, 0.7);
  padding: 2rem 0;
  margin-top: 4rem;
  text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .events-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats {
    flex-wrap: wrap;
    justify-content: center;
  }

  .filter-bar {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }

  .lightbox-nav {
    width: 40px;
    height: 40px;
  }
}

/* Dark theme overrides for photowall page */
.photowall-page .header {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.photowall-page .logo {
  color: white;
}

.photowall-page .nav a {
  color: rgba(255, 255, 255, 0.8);
}

.photowall-page .nav a:hover,
.photowall-page .nav a.active {
  color: white;
  border-bottom-color: white;
}

.photowall-page .spinner {
  border-color: rgba(255, 255, 255, 0.2);
  border-top-color: white;
}

/* Admin Layout */
.admin-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: calc(100vh - 60px);
}

.sidebar {
  background: white;
  border-right: 1px solid var(--border-color);
  padding: 1.5rem;
}

.sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav a {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  color: var(--text-color);
  margin-bottom: 0.25rem;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: var(--primary-color);
  color: white;
  text-decoration: none;
}

.main-content {
  padding: 1.5rem;
  background: var(--light-bg);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

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

.section-header h2 {
  margin: 0;
}

.pending-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.bulk-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  padding: 1rem;
  background: white;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.selection-info {
  margin-right: auto;
  font-weight: 500;
}

.actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.event-form {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.event-list {
  display: grid;
  gap: 1rem;
}

.event-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: white;
  border-radius: var(--radius);
  gap: 1rem;
}

.event-list-item h4 {
  margin: 0 0 0.25rem;
}

.event-list-item p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.event-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  cursor: pointer;
  white-space: nowrap;
}

.toggle-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* Upload Page */
.upload-form {
  max-width: 600px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.upload-area:hover {
  border-color: var(--primary-color);
  background: rgba(74, 144, 164, 0.05);
}

.upload-area.dragover {
  border-color: var(--primary-color);
  background: rgba(74, 144, 164, 0.1);
}

.upload-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.upload-text {
  font-size: 1.125rem;
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

.upload-hint {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.preview-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  margin-top: 1rem;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary-color);
  width: 0%;
  transition: width 0.3s;
}

.upload-status {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius);
  text-align: center;
}

.upload-status.success {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success-color);
}

.upload-status.error {
  background: rgba(220, 53, 69, 0.1);
  color: var(--danger-color);
}

/* Responsive Admin */
@media (max-width: 768px) {
  .admin-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .sidebar-nav {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
  }

  .sidebar-nav a {
    white-space: nowrap;
  }
}