/* Root styles and dark theme */
:root {
  --primary-bg: #0a0a0a;
  --secondary-bg: #1a1a1a;
  --tertiary-bg: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --border-color: #333333;
  --accent-color: #4a9eff;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--primary-bg);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
}

/* Container and layout */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.header h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.upload-nav-link {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--accent-color);
  color: var(--primary-bg);
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
  transition: var(--transition);
  font-size: 1rem;
}

.upload-nav-link:hover {
  background-color: #3a8eef;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 158, 255, 0.3);
}

.upload-nav-link:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Main content */
.main-content {
  padding: 20px 0;
}

/* Gallery section */
.gallery-section {
  width: 100%;
}

/* Gallery grid - responsive CSS Grid */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  width: 100%;
}

/* Gallery item */
.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
  background-color: var(--secondary-bg);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  aspect-ratio: 1;
}

.gallery-item:hover {
  border-color: var(--accent-color);
  transform: scale(1.02);
  box-shadow: 0 8px 24px rgba(74, 158, 255, 0.2);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: var(--transition);
}

.gallery-item:hover img {
  filter: brightness(1.1);
}

.gallery-item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  padding: 20px;
  transform: translateY(100%);
  transition: var(--transition);
}

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

.gallery-item-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Lightbox styles */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: -1;
}

.lightbox-modal {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  background-color: var(--secondary-bg);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: fadeInScale 0.3s ease;
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
  background-color: rgba(0, 0, 0, 0.5);
  border: none;
  color: var(--text-primary);
  font-size: 2.5rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  padding: 0;
}

.lightbox-close:hover {
  background-color: var(--accent-color);
  transform: rotate(90deg);
}

.lightbox-figure {
  display: flex;
  flex-direction: column;
  height: 100%;
  margin: 0;
  padding: 0;
}

.lightbox-image {
  width: 100%;
  height: auto;
  max-height: calc(90vh - 150px);
  object-fit: contain;
  object-position: center;
}

.lightbox-caption {
  background-color: var(--tertiary-bg);
  padding: 20px;
  border-top: 1px solid var(--border-color);
}

.lightbox-caption h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.lightbox-caption p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Navigation buttons */
.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0, 0, 0, 0.5);
  border: none;
  color: var(--text-primary);
  font-size: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  padding: 0;
  z-index: 20;
}

.lightbox-nav:hover:not(:disabled) {
  background-color: var(--accent-color);
}

.lightbox-nav:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.lightbox-prev {
  left: 20px;
}

.lightbox-next {
  right: 20px;
}

.lightbox-nav:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Metadata content */
.lightbox-metadata-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lightbox-metadata-content p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.lightbox-metadata-content strong {
  color: var(--text-primary);
}

/* Delete button */
.delete-button {
  padding: 10px 20px;
  background-color: #ff6b6b;
  color: var(--text-primary);
  border: none;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 15px;
  width: 100%;
}

.delete-button:hover {
  background-color: #ff5252;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.delete-button:focus-visible {
  outline: 2px solid #ff6b6b;
  outline-offset: 2px;
}

.delete-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Confirmation Modal */
.confirmation-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.confirmation-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: -1;
}

.confirmation-modal-dialog {
  position: relative;
  background-color: var(--secondary-bg);
  border-radius: 8px;
  padding: 30px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.3s ease;
}

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

.confirmation-modal-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.confirmation-modal-message {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 25px;
  margin: 0 0 25px;
}

.confirmation-modal-buttons {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.confirmation-modal-cancel,
.confirmation-modal-delete {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  min-width: 100px;
}

.confirmation-modal-cancel {
  background-color: var(--tertiary-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.confirmation-modal-cancel:hover {
  background-color: var(--border-color);
}

.confirmation-modal-cancel:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.confirmation-modal-delete {
  background-color: #ff6b6b;
  color: var(--text-primary);
}

.confirmation-modal-delete:hover {
  background-color: #ff5252;
}

.confirmation-modal-delete:focus-visible {
  outline: 2px solid #ff6b6b;
  outline-offset: 2px;
}

/* Message container and notifications */
.message-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 3000;
  max-width: 400px;
}

.message {
  padding: 16px 20px;
  border-radius: 4px;
  font-weight: 500;
  font-size: 0.95rem;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.message-success {
  background-color: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  color: #4caf50;
}

.message-error {
  background-color: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.3);
  color: #ff6b6b;
}

/* Responsive design */

/* Mobile: ≤480px - single column */
@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }

  .header {
    padding: 40px 0 30px;
    margin-bottom: 30px;
  }

  .header h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .lightbox-modal {
    max-width: 95vw;
    max-height: 95vh;
    border-radius: 4px;
  }

  .lightbox-close {
    width: 40px;
    height: 40px;
    font-size: 2rem;
    top: 10px;
    right: 10px;
  }

  .lightbox-nav {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
  }

  .lightbox-prev {
    left: 10px;
  }

  .lightbox-next {
    right: 10px;
  }

  .lightbox-image {
    max-height: calc(95vh - 120px);
  }

  .lightbox-caption {
    padding: 15px;
  }

  .lightbox-caption h2 {
    font-size: 1.2rem;
  }

  .gallery-item-overlay {
    padding: 15px;
  }

  .confirmation-modal-dialog {
    max-width: 90vw;
    padding: 20px;
  }

  .confirmation-modal-title {
    font-size: 1.1rem;
  }

  .confirmation-modal-message {
    font-size: 0.9rem;
  }

  .delete-button {
    padding: 8px 16px;
    font-size: 0.9rem;
  }

  .message-container {
    left: 20px;
    right: 20px;
  }
}

/* Tablet: 481px - 768px - two columns */
@media (min-width: 481px) and (max-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .header {
    padding: 50px 0 35px;
    margin-bottom: 35px;
  }

  .header h1 {
    font-size: 2.5rem;
  }
}

/* Desktop: 769px+ - three or more columns */
@media (min-width: 769px) {
  .gallery-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
  }
}

/* Large desktop: 1200px+ - optimize for larger screens */
@media (min-width: 1200px) {
  .container {
    padding: 0 40px;
  }

  .gallery-grid {
    gap: 28px;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
.gallery-item:focus-visible,
.lightbox-close:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Upload page styles */
.upload-section {
  width: 100%;
  padding: 20px 0 40px;
}

.upload-container {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 40px;
}

.back-link {
  display: inline-block;
  color: var(--accent-color);
  text-decoration: none;
  font-size: 1rem;
  margin-bottom: 30px;
  transition: var(--transition);
}

.back-link:hover {
  color: var(--text-primary);
}

.back-link:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Preview container */
.preview-container {
  margin-bottom: 30px;
  text-align: center;
  padding: 20px;
  background-color: var(--tertiary-bg);
  border-radius: 8px;
}

.preview-image {
  max-width: 100%;
  max-height: 300px;
  width: auto;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Form styles */
.upload-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.form-label:has(+ input[required])::after {
  content: ' *';
  color: #ff6b6b;
}

.upload-form input[type="file"],
.upload-form input[type="text"],
.upload-form input[type="date"],
.upload-form textarea {
  padding: 12px;
  background-color: var(--tertiary-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.upload-form input[type="file"]::file-selector-button {
  background-color: var(--accent-color);
  color: var(--primary-bg);
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  margin-right: 12px;
  transition: var(--transition);
}

.upload-form input[type="file"]::file-selector-button:hover {
  background-color: #3a8eef;
}

.upload-form input[type="text"]:focus,
.upload-form input[type="date"]:focus,
.upload-form textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.1);
}

.metadata-textarea {
  resize: vertical;
  min-height: 100px;
}

/* Progress bar */
.progress-container {
  margin: 20px 0;
  padding: 16px;
  background-color: var(--tertiary-bg);
  border-radius: 4px;
}

.progress-bar-wrapper {
  width: 100%;
  height: 8px;
  background-color: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 12px;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-color), #3a8eef);
  border-radius: 4px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Error message */
.error-message {
  color: #ff6b6b;
  font-size: 0.9rem;
  margin: 0;
  display: none;
}

/* Success message */
.success-message {
  padding: 16px;
  background-color: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  border-radius: 4px;
  text-align: center;
}

.success-message p {
  color: #4caf50;
  font-weight: 600;
  margin: 0 0 12px;
}

.gallery-link {
  color: var(--accent-color);
  text-decoration: none;
  transition: var(--transition);
}

.gallery-link:hover {
  color: var(--text-primary);
}

.gallery-link:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Submit button */
.submit-button {
  padding: 12px 24px;
  background-color: var(--accent-color);
  color: var(--primary-bg);
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 10px;
}

.submit-button:hover:not(:disabled) {
  background-color: #3a8eef;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 158, 255, 0.3);
}

.submit-button:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.submit-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Responsive upload page */
@media (max-width: 480px) {
  .upload-container {
    padding: 24px 16px;
  }

  .upload-form input[type="file"],
  .upload-form input[type="text"],
  .upload-form input[type="date"],
  .upload-form textarea {
    font-size: 16px;
  }

  .metadata-textarea {
    min-height: 80px;
  }

  .preview-image {
    max-height: 250px;
  }

  .back-link {
    font-size: 0.9rem;
    margin-bottom: 24px;
  }
}

@media (max-width: 768px) {
  .upload-container {
    max-width: 100%;
  }
}