/* ================================
   DAYDAYUP DESIGN SYSTEM
   Matches Flutter app theme (app_theme.dart)
   ================================ */

:root {
  /* Tailwind gray scale — matching Flutter app exactly */
  --gray-950: #030712;
  --gray-900: #111827;
  --gray-800: #1F2937;
  --gray-700: #374151;
  --gray-600: #4B5563;
  --gray-500: #6B7280;
  --gray-400: #9CA3AF;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --gray-50: #F9FAFB;

  /* Accent colors */
  --blue-400: #60A5FA;
  --blue-500: #3B82F6;
  --pink-500: #EC4899;
  --purple-500: #8B5CF6;
  --green-500: #22C55E;
  --red-500: #EF4444;

  /* Semantic tokens — light mode */
  --bg: #FFFFFF;
  --surface: #FFFFFF;
  --surface-raised: var(--gray-50);
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-500);
  --text-tertiary: var(--gray-400);
  --border: var(--gray-200);
  --input-bg: var(--gray-100);
  --btn-bg: var(--gray-900);
  --btn-text: #FFFFFF;
  --btn-disabled-bg: var(--gray-300);
  --btn-disabled-text: var(--gray-500);
  --accent: var(--blue-500);
  --error: var(--red-500);
  --success: var(--green-500);

  /* Gradient — pink to purple (used sparingly for accents) */
  --gradient: linear-gradient(135deg, var(--pink-500), var(--purple-500));

  /* Radii — matching Flutter app */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-pill: 9999px;

  /* Font */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--gray-950);
    --surface: var(--gray-900);
    --surface-raised: var(--gray-800);
    --text-primary: #FFFFFF;
    --text-secondary: var(--gray-400);
    --text-tertiary: var(--gray-600);
    --border: var(--gray-700);
    --input-bg: var(--gray-800);
    --btn-bg: #FFFFFF;
    --btn-text: var(--gray-950);
    --btn-disabled-bg: var(--gray-700);
    --btn-disabled-text: var(--gray-400);
    --accent: var(--blue-400);
  }
}

/* ================================
   BASE RESET & TYPOGRAPHY
   ================================ */

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

body {
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s;
}

a:hover {
  color: var(--accent);
}

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ================================
   LAYOUT
   ================================ */

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ================================
   HEADER / LOGO
   ================================ */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.logo img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.logo h2 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

nav a {
  margin-left: 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

nav a:hover {
  color: var(--text-primary);
}

/* ================================
   BUTTONS — dark bg, white text (matching Flutter ElevatedButton)
   ================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s;
  text-decoration: none;
  line-height: 1.4;
}

.btn:hover {
  opacity: 0.88;
  color: var(--btn-text);
  transform: translateY(-1px);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  background-color: var(--btn-disabled-bg);
  color: var(--btn-disabled-text);
  cursor: not-allowed;
  transform: none;
  opacity: 1;
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background-color: var(--surface-raised);
  color: var(--text-primary);
  border-color: var(--gray-300);
}

.btn-gradient {
  background: var(--gradient);
  color: #FFFFFF;
  border: none;
}

.btn-gradient:hover {
  color: #FFFFFF;
  opacity: 0.92;
}

.btn-danger {
  background-color: var(--red-500);
  color: #FFFFFF;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  border-radius: 10px;
}

.btn-xs {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* ================================
   FORMS — filled inputs, no border (matching Flutter InputDecoration)
   ================================ */

.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  margin-bottom: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

input, textarea, select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: var(--radius-md);
  background-color: var(--input-bg);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.9375rem;
  transition: box-shadow 0.15s;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

input::placeholder, textarea::placeholder {
  color: var(--text-tertiary);
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: var(--radius-md);
  background-color: var(--input-bg);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.9375rem;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

.error-message {
  color: var(--error);
  font-size: 0.875rem;
  margin-top: 0.75rem;
  display: none;
}

.success-message {
  color: var(--success);
  font-size: 0.875rem;
  margin-top: 0.75rem;
  display: none;
}

/* ================================
   HERO SECTION
   ================================ */

.hero {
  text-align: center;
  padding: 5rem 0 3rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ================================
   FEATURE CARDS
   ================================ */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin: 3rem 0;
}

.feature-card {
  background-color: var(--surface-raised);
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ================================
   FOOTER
   ================================ */

footer {
  text-align: center;
  padding: 2.5rem 0 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border);
}

footer p {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

footer a {
  color: var(--text-secondary);
}

/* ================================
   LOGIN / SIGNUP CARD
   ================================ */

.login-card {
  max-width: 400px;
  margin: 0 auto;
  background: var(--surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.form-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.875rem;
}

.form-footer p {
  color: var(--text-secondary);
}

.btn-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* ================================
   GALLERY LAYOUT
   ================================ */

.gallery-container {
  max-width: 1400px;
  padding: 1.5rem;
}

.gallery-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.portal-badge {
  background: var(--gradient);
  color: white;
  padding: 0.2rem 0.625rem;
  border-radius: var(--radius-pill);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.gallery-header nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.language-select {
  padding: 0.5rem 0.75rem;
  border: none;
  border-radius: var(--radius-md);
  background-color: var(--input-bg);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.875rem;
  cursor: pointer;
}

.language-select:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
}

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

/* ================================
   GALLERY HERO
   ================================ */

.gallery-hero {
  text-align: center;
  padding: 1.5rem 0 0.5rem;
}

.gallery-hero h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.gallery-hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ================================
   SEARCH & FILTERS
   ================================ */

.filters-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.search-container {
  position: relative;
  max-width: 380px;
}

.search-icon {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 1rem;
}

.search-input {
  padding: 0.625rem 1rem 0.625rem 2.5rem;
  font-size: 0.875rem;
  border: none;
  border-radius: var(--radius-pill);
  background-color: var(--input-bg);
}

.search-input:focus {
  box-shadow: 0 0 0 2px var(--accent);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.filter-chip {
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

.filter-chip:hover {
  border-color: var(--gray-400);
  color: var(--text-primary);
}

.filter-chip.active {
  background: var(--btn-bg);
  border-color: var(--btn-bg);
  color: var(--btn-text);
}

/* ================================
   STORY CARDS — flat, borderless image + metadata
   ================================ */

.story-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  padding-bottom: 2rem;
}

.story-card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.story-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.story-card-image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--input-bg);
}

.story-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.story-card:hover .story-card-image img {
  transform: scale(1.03);
}

.story-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.6), transparent 60%);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 0.875rem;
  opacity: 0;
  transition: opacity 0.25s;
}

.story-card:hover .story-card-overlay {
  opacity: 1;
}

.preview-text {
  color: white;
  font-weight: 600;
  font-size: 0.8125rem;
  padding: 0.375rem 0.875rem;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-pill);
}

.story-card-content {
  padding: 1rem 1.125rem 1.125rem;
}

.story-card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.125rem;
  color: var(--text-primary);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.story-card-native-title {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.story-card-description {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.story-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.difficulty-badge {
  padding: 0.2rem 0.625rem;
  border-radius: var(--radius-md);
  font-size: 0.6875rem;
  font-weight: 700;
  color: white;
}

.chapter-count {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.language-badge {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-left: auto;
}

/* ================================
   LOADING / ERROR / EMPTY STATES
   ================================ */

.loading-state,
.error-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 5rem 2rem;
  text-align: center;
}

.loader {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--text-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loader-small {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

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

.error-icon,
.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.2;
}

.error-state .error-icon {
  color: var(--error);
  opacity: 0.5;
}

/* ================================
   STORY VIEWER
   ================================ */

.viewer-container {
  min-height: 100vh;
  background-color: var(--bg);
}

.viewer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.back-button {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
}

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

.story-hero {
  position: relative;
  height: 280px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: flex-end;
}

.story-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.15));
}

.story-hero-content {
  position: relative;
  z-index: 1;
  padding: 2rem;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

.story-hero h1 {
  color: white;
  font-size: 2.25rem;
  margin-bottom: 0.25rem;
}

.story-title-native {
  color: rgba(255, 255, 255, 0.75);
  font-size: 1.375rem;
  margin-bottom: 1rem;
}

.story-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.meta-chip {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-pill);
  color: white;
  font-size: 0.8125rem;
  font-weight: 500;
}

.story-description-section,
.chapters-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.story-description-section h2,
.chapters-section h2 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.story-author {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  color: var(--text-tertiary);
  font-style: italic;
  font-size: 0.875rem;
}

/* ================================
   CHAPTERS LIST
   ================================ */

.chapters-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.875rem 1.25rem;
  background-color: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
}

.chapter-item:hover {
  border-color: var(--gray-400);
  transform: translateX(3px);
}

.chapter-number {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient);
  color: white;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.8125rem;
  flex-shrink: 0;
}

.chapter-info {
  flex: 1;
  min-width: 0;
}

.chapter-info h4 {
  margin-bottom: 0.125rem;
  font-size: 0.9375rem;
  font-weight: 600;
}

.chapter-native-title {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.chapter-arrow {
  opacity: 0.25;
  transition: opacity 0.15s, transform 0.15s;
  color: var(--text-secondary);
}

.chapter-item:hover .chapter-arrow {
  opacity: 0.7;
  transform: translateX(3px);
}

/* ================================
   MODAL
   ================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.2s;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal {
  background-color: var(--surface);
  width: 90%;
  max-width: 800px;
  max-height: 90vh;
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  transform: scale(0.95);
  transition: transform 0.2s;
  overflow: hidden;
  border: 1px solid var(--border);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  margin: 0;
  font-size: 1.125rem;
}

.close-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.375rem;
  color: var(--text-tertiary);
  transition: color 0.15s;
  font-size: 1.375rem;
  line-height: 1;
}

.close-btn:hover {
  color: var(--text-primary);
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

.chapter-content {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-primary);
}

.chapter-content p {
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.modal-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
}

.modal-footer .btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Assignment Modal */
.assign-modal .modal {
  max-width: 480px;
}

.classes-checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  max-height: 200px;
  overflow-y: auto;
}

.class-checkbox {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  background-color: var(--input-bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.15s;
}

.class-checkbox:hover {
  background-color: var(--gray-200);
}

@media (prefers-color-scheme: dark) {
  .class-checkbox:hover {
    background-color: var(--gray-700);
  }
}

.class-checkbox input {
  width: auto;
  cursor: pointer;
}

.no-classes-message {
  color: var(--error);
  font-size: 0.875rem;
  padding: 0.875rem;
  background-color: rgba(239, 68, 68, 0.08);
  border-radius: var(--radius-sm);
}

/* ================================
   IMAGE MANAGEMENT (Admin)
   ================================ */

.image-management-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  border-top: 1px solid var(--border);
}

.image-management-section h2 {
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
}

.image-card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  border: 1px solid var(--border);
}

.image-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.image-card-header h3 {
  margin: 0;
  font-size: 1rem;
}

.image-card-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  cursor: pointer;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.checkbox-label input {
  width: auto;
}

.image-preview-container {
  position: relative;
  min-height: 120px;
  background: var(--input-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.image-preview {
  width: 100%;
  max-height: 400px;
  object-fit: contain;
  display: block;
}

.image-loading,
.image-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2.5rem;
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

.image-metadata {
  margin-top: 0.75rem;
  padding: 0.875rem;
  background: var(--input-bg);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* Chunk Images */
.chunk-chapter-section {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.chunk-chapter-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.chunk-chapter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chunk-chapter-header h4 {
  margin: 0;
  font-size: 0.9375rem;
}

.chunk-images-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.75rem;
}

.chunk-image-item {
  position: relative;
  background: var(--input-bg);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.chunk-image-number {
  padding: 0.375rem;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--surface-raised);
  color: var(--text-secondary);
}

.chunk-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.chunk-generating,
.chunk-pending {
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.chunk-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 1.5rem;
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

.regenerate-chunk-btn {
  margin: 0.5rem;
}

/* ================================
   RESPONSIVE
   ================================ */

@media (max-width: 768px) {
  .gallery-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .gallery-header nav {
    width: 100%;
    justify-content: space-between;
  }

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

  .hero h1 {
    font-size: 2.25rem;
  }

  .story-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
  }

  .story-hero {
    height: 220px;
  }

  .story-hero h1 {
    font-size: 1.625rem;
  }

  .story-title-native {
    font-size: 1.125rem;
  }

  .modal {
    width: 95%;
    max-height: 95vh;
  }

  .modal-body {
    padding: 1.25rem;
  }

  .viewer-header {
    padding: 0.625rem 1rem;
  }

  .image-card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .chunk-images-grid {
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  }
}