/* ============================================================
   Image Bridge — "Friendly Studio" Theme
   Dual light/dark with system-preference + user toggle
   ============================================================ */

/* ---------- Light theme (default) ---------- */
:root,
[data-bs-theme="light"] {
  --bg-primary: #FEFCF8;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-input: #F8F6F1;
  --border-color: #E5E2DB;
  --border-subtle: #F0EDE6;
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-glow: 0 4px 20px rgba(249,115,22,0.18);
  --accent-primary: #F97316;
  --accent-primary-hover: #EA580C;
  --accent-secondary: #14B8A6;
  --accent-secondary-hover: #0D9488;
  --accent-tertiary: #8B5CF6;
  --danger: #EF4444;
  --danger-hover: #DC2626;
  --warning: #F59E0B;
  --success: #10B981;
  --overlay-bg: rgba(0,0,0,0.35);
  --nav-bg: rgba(255,255,255,0.85);
  --badge-notification: #EF4444;
  color-scheme: light;
}

/* ---------- Dark theme ---------- */
[data-bs-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-card: #1E293B;
  --bg-input: #0F172A;
  --border-color: #334155;
  --border-subtle: #1E293B;
  --text-primary: #E2E8F0;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.4);
  --shadow-glow: 0 4px 20px rgba(249,115,22,0.25);
  --overlay-bg: rgba(0,0,0,0.55);
  --nav-bg: rgba(15,23,42,0.88);
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { transition: background-color 0.2s ease, border-color 0.2s ease, color 0.15s ease, box-shadow 0.2s ease; }

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Nunito Sans', 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6,
.navbar-brand, .page-heading {
  font-family: 'Fredoka', 'Nunito Sans', sans-serif;
  font-weight: 500;
}

/* Page entrance animation */
.page-content {
  animation: fadeSlideIn 0.35s ease-out;
}
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Navbar ---------- */
.navbar {
  background: var(--nav-bg) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding-top: 0.6rem;
  padding-bottom: 0.6rem;
}

.navbar-brand {
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  font-size: 1.35rem;
  color: var(--accent-primary) !important;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.navbar-brand .bi {
  font-size: 1.3rem;
}

.navbar .nav-link {
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.45rem 0.85rem !important;
  border-radius: 8px;
  color: var(--text-secondary) !important;
  transition: color 0.15s, background 0.15s;
}
.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--accent-primary) !important;
  background: rgba(249,115,22,0.08);
}

.navbar .dropdown-menu {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.4rem;
  box-shadow: var(--shadow-lg);
  min-width: 11rem;
}
.navbar .dropdown-item {
  border-radius: 8px;
  padding: 0.5rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
}
.navbar .dropdown-item:hover,
.navbar .dropdown-item:focus {
  background: rgba(249,115,22,0.08);
  color: var(--accent-primary);
}

.navbar-toggler {
  border-color: var(--border-color);
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  padding: 0.35rem 0.55rem;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  display: flex;
  align-items: center;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.theme-toggle:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: rgba(249,115,22,0.06);
}

/* Notification badges in navbar */
.nav-link .badge {
  font-size: 0.6rem;
  vertical-align: top;
  margin-left: 3px;
  background: var(--badge-notification) !important;
  animation: badgePulse 2s ease-in-out infinite;
}
@keyframes badgePulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.15); }
}

/* ---------- Flash alerts ---------- */
.alert-info {
  background: rgba(249,115,22,0.09);
  border: 1px solid rgba(249,115,22,0.25);
  border-radius: 12px;
  color: var(--text-primary);
  font-weight: 500;
}

/* ---------- Prompt Section ---------- */
.prompt-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.prompt-section h2 {
  font-size: 1.45rem;
  margin-bottom: 0.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.prompt-section .subtitle {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 0.92rem;
}

.prompt-textarea {
  background: var(--bg-input) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 14px !important;
  color: var(--text-primary) !important;
  padding: 1rem 1.15rem !important;
  font-size: 0.95rem;
  font-family: 'Nunito Sans', sans-serif;
  resize: vertical;
  min-height: 100px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.prompt-textarea:focus {
  border-color: var(--accent-primary) !important;
  box-shadow: 0 0 0 3px rgba(249,115,22,0.13) !important;
  outline: none;
}

.prompt-textarea::placeholder {
  color: var(--text-muted) !important;
}

/* ---------- Buttons ---------- */
.btn-generate {
  background: linear-gradient(135deg, var(--accent-primary), #FB923C);
  border: none;
  border-radius: 12px;
  color: #fff;
  font-family: 'Fredoka', sans-serif;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.7rem 1.8rem;
  transition: transform 0.15s, box-shadow 0.2s, filter 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  cursor: pointer;
}

.btn-generate:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  filter: brightness(1.05);
}

.btn-generate:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-generate:disabled {
  opacity: 0.55;
  transform: none;
  box-shadow: none;
  cursor: not-allowed;
}

.btn-danger-outline {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 10px;
  padding: 0.4rem 0.9rem;
  font-weight: 600;
  font-size: 0.82rem;
  transition: all 0.15s;
}

.btn-danger-outline:hover {
  background: var(--danger);
  color: #fff;
}

.btn-back {
  color: var(--text-secondary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  transition: color 0.15s;
}

.btn-back:hover {
  color: var(--accent-primary);
}

/* ---------- Gallery Grid ---------- */
.gallery-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.gallery-header h3 {
  font-size: 1.2rem;
  margin: 0;
}

.gallery-count {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}

@media (min-width: 1400px) {
  .gallery-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 992px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 576px) {
  .gallery-grid { grid-template-columns: 1fr; }
}

/* ---------- Image Card ---------- */
.image-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: block;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.image-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  color: inherit;
  text-decoration: none;
}

.image-card .card-img-wrapper {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1;
}

.image-card .card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.image-card:hover .card-img-wrapper img {
  transform: scale(1.06);
}

.image-card .card-img-overlay {
  position: absolute;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s;
}

.image-card:hover .card-img-overlay {
  opacity: 1;
}

.image-card .card-body {
  padding: 0.85rem 1rem;
}

.image-card .card-prompt {
  font-size: 0.84rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.45;
  margin-bottom: 0.3rem;
}

.image-card .card-time {
  font-size: 0.73rem;
  color: var(--text-muted);
}

/* ---------- View Image Page ---------- */
.view-image-container {
  max-width: 800px;
  margin: 0 auto;
}

.view-image-container .image-display {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
}

.view-image-container .image-display img {
  width: 100%;
  height: auto;
  display: block;
}

.view-image-container .image-meta {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.view-image-container .image-prompt {
  font-size: 1.02rem;
  line-height: 1.65;
  margin-bottom: 0.7rem;
}

.view-image-container .image-time {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* ---------- Profile ---------- */
.profile-header {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 2rem;
  margin-bottom: 2rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  box-shadow: var(--shadow-sm);
}

.profile-header img {
  border-radius: 50%;
  border: 3px solid var(--border-color);
}

.profile-info h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
.profile-info .profile-bio { color: var(--text-secondary); margin-bottom: 0.5rem; }
.profile-info .profile-stats { color: var(--text-secondary); font-size: 0.9rem; }

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 3.2rem;
  margin-bottom: 0.8rem;
  opacity: 0.45;
}

.empty-state p {
  font-size: 1rem;
  max-width: 320px;
  margin: 0 auto;
  line-height: 1.5;
}

/* ---------- Cards (generic) ---------- */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}

/* ---------- Stat Cards ---------- */
.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.35rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: 16px 16px 0 0;
  background: var(--stat-accent, var(--accent-primary));
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.stat-card .stat-icon {
  font-size: 1.5rem;
  color: var(--stat-accent, var(--accent-primary));
  margin-bottom: 0.3rem;
}
.stat-card .stat-number {
  font-family: 'Fredoka', sans-serif;
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}
.stat-card .stat-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.45rem;
}

/* stat accent variants */
.stat-card.accent-orange  { --stat-accent: #F97316; }
.stat-card.accent-teal    { --stat-accent: #14B8A6; }
.stat-card.accent-purple  { --stat-accent: #8B5CF6; }
.stat-card.accent-red     { --stat-accent: #EF4444; }
.stat-card.accent-green   { --stat-accent: #10B981; }
.stat-card.accent-blue    { --stat-accent: #3B82F6; }
.stat-card.accent-amber   { --stat-accent: #F59E0B; }

/* ---------- Tables ---------- */
.ib-table {
  --bs-table-bg: var(--bg-secondary);
  --bs-table-border-color: var(--border-color);
  --bs-table-hover-bg: rgba(249,115,22,0.04);
  --bs-table-striped-bg: rgba(0,0,0,0.015);
  border-collapse: separate;
  border-spacing: 0;
}
[data-bs-theme="dark"] .ib-table {
  --bs-table-striped-bg: rgba(255,255,255,0.02);
  --bs-table-hover-bg: rgba(249,115,22,0.06);
}
.ib-table thead th {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
  border-bottom: 2px solid var(--border-color);
  padding: 0.7rem 0.85rem;
}
.ib-table tbody td {
  padding: 0.75rem 0.85rem;
  vertical-align: middle;
  border-bottom: 1px solid var(--border-subtle);
}

/* ---------- Prompt Card (My Prompts) ---------- */
.prompt-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.15rem 1.35rem;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s;
}
.prompt-card:hover {
  box-shadow: var(--shadow-md);
}
.prompt-card .prompt-text {
  font-size: 0.92rem;
  line-height: 1.5;
  margin-bottom: 0.55rem;
  color: var(--text-primary);
}
.prompt-card .prompt-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- Status Badges ---------- */
.badge { font-weight: 600; font-size: 0.72rem; }

.badge-pending {
  background: rgba(245,158,11,0.15);
  color: #D97706;
  border: 1px solid rgba(245,158,11,0.3);
}
.badge-generating {
  background: rgba(20,184,166,0.12);
  color: #0D9488;
  border: 1px solid rgba(20,184,166,0.3);
}
.badge-approved {
  background: rgba(16,185,129,0.12);
  color: #059669;
  border: 1px solid rgba(16,185,129,0.3);
}
.badge-rejected, .badge-failed {
  background: rgba(239,68,68,0.1);
  color: #DC2626;
  border: 1px solid rgba(239,68,68,0.25);
}
.badge-review {
  background: rgba(139,92,246,0.12);
  color: #7C3AED;
  border: 1px solid rgba(139,92,246,0.25);
}

[data-bs-theme="dark"] .badge-pending  { color: #FBBF24; }
[data-bs-theme="dark"] .badge-generating { color: #2DD4BF; }
[data-bs-theme="dark"] .badge-approved { color: #34D399; }
[data-bs-theme="dark"] .badge-rejected,
[data-bs-theme="dark"] .badge-failed   { color: #F87171; }
[data-bs-theme="dark"] .badge-review   { color: #A78BFA; }

/* ---------- Forms ---------- */
.form-control, .form-select {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  padding: 0.55rem 0.85rem;
  font-size: 0.9rem;
}

.form-control:focus, .form-select:focus {
  background-color: var(--bg-input);
  border-color: var(--accent-primary);
  color: var(--text-primary);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.12);
}

.form-check-input:checked {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}
.form-check-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.12);
}

.form-label {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

/* ---------- Pagination ---------- */
.pagination .page-link {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  color: var(--text-primary);
  border-radius: 10px;
  margin: 0 0.15rem;
  font-weight: 600;
  font-size: 0.85rem;
}

.pagination .page-link:hover {
  background: rgba(249,115,22,0.08);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.pagination .page-item.disabled .page-link {
  background: var(--bg-primary);
  border-color: var(--border-subtle);
  color: var(--text-muted);
}

/* ---------- Auth pages (centered card) ---------- */
.auth-card-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - 160px);
}
.auth-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2.5rem 2.25rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-md);
}
.auth-card .auth-brand {
  text-align: center;
  margin-bottom: 1.8rem;
}
.auth-card .auth-brand i {
  font-size: 2.2rem;
  color: var(--accent-primary);
  display: block;
  margin-bottom: 0.5rem;
}
.auth-card .auth-brand h1 {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.6rem;
  color: var(--accent-primary);
  margin: 0;
}

/* ---------- Review cards (teacher prompts/images) ---------- */
.review-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 0.75rem 1.35rem;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow-sm);
}

/* Review image thumbnails */
.review-thumbnail {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.review-thumbnail:hover {
  transform: scale(1.08);
  box-shadow: var(--shadow-md);
}
.review-thumb-link {
  display: block;
  line-height: 0;
}

/* ---------- Error pages ---------- */
.error-page {
  text-align: center;
  padding: 4rem 1rem 3rem;
}
.error-page .error-icon {
  font-size: 4rem;
  color: var(--accent-primary);
  margin-bottom: 1rem;
}
.error-page h1 {
  font-size: 1.6rem;
  margin-bottom: 0.6rem;
}
.error-page p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

/* ---------- Spinner ---------- */
.spinner {
  display: none;
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid rgba(249,115,22,0.25);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Table (legacy fallback) ---------- */
.table-dark {
  --bs-table-bg: var(--bg-secondary);
  --bs-table-border-color: var(--border-color);
}

/* ---------- Responsive safety at 1366×768 ---------- */
@media (max-width: 1399px) {
  .prompt-section { padding: 1.5rem; }
  .stat-card .stat-number { font-size: 1.7rem; }
}
@media (max-width: 768px) {
  .prompt-section { padding: 1.25rem; border-radius: 14px; }
  .gallery-grid { gap: 1rem; }
  .auth-card { padding: 2rem 1.5rem; }
}

.table-dark.table-hover > tbody > tr:hover > * {
  --bs-table-bg-state: var(--bg-card);
}