/* ── Design Tokens ─────────────────────────────────────────────────────── */
:root {
  --bg-base:      #0d0d14;
  --bg-surface:   #14141f;
  --bg-elevated:  #1c1c2b;
  --border:       #252538;
  --text-primary: #e4e4f0;
  --text-muted:   #7878a0;
  --accent:       #4361ee;
  --accent-hover: #5570f1;
  --accent-muted: rgba(67, 97, 238, 0.15);
  --radius-sm:    6px;
  --radius-md:    10px;
  --radius-lg:    16px;
  --transition:   0.15s ease;
}

/* ── Bootstrap dark-mode variable overrides ────────────────────────────── */
[data-bs-theme="dark"] {
  --bs-body-bg:         var(--bg-base);
  --bs-body-color:      var(--text-primary);
  --bs-card-bg:         var(--bg-surface);
  --bs-border-color:    var(--border);
  --bs-modal-bg:        var(--bg-elevated);
  --bs-dropdown-bg:     var(--bg-elevated);
  --bs-link-color:      var(--accent);
  --bs-link-hover-color: var(--accent-hover);
}

/* ── Typography ─────────────────────────────────────────────────────────── */
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

/* ── Navbar ─────────────────────────────────────────────────────────────── */
.navbar {
  background-color: rgba(20, 20, 31, 0.82) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 0.6rem;
  padding-bottom: 0.6rem;
  position: sticky;
  top: 0;
  z-index: 1030;
}
.navbar-brand {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  color: var(--text-primary) !important;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.navbar-brand img {
  max-height: 40px;
  width: auto;
}

.nav-link {
  color: var(--text-muted) !important;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem !important;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background-color var(--transition);
}
.nav-link:hover {
  color: var(--text-primary) !important;
  background-color: rgba(255, 255, 255, 0.04);
}
.nav-link.active {
  color: var(--text-primary) !important;
  background-color: var(--accent-muted);
}
.navbar-toggler { color: var(--text-muted); }
.navbar-toggler-icon { filter: invert(0.7); }

/* ── User avatar ────────────────────────────────────────────────────────── */
.user-avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  object-fit: cover;
}

/* ── Dropdown ───────────────────────────────────────────────────────────── */
.dropdown-menu {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  padding: 0.35rem;
}
.dropdown-item {
  color: var(--text-primary);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.75rem;
}
.dropdown-item:hover,
.dropdown-item:focus {
  background-color: var(--accent-muted);
  color: var(--text-primary);
}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn { border-radius: var(--radius-sm); font-weight: 500; font-size: 0.875rem; }

.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 1px 6px rgba(67, 97, 238, 0.22);
}
.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 4px 18px rgba(67, 97, 238, 0.45);
}

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

.btn-outline-secondary {
  color: var(--text-muted);
  border-color: var(--border);
}
.btn-outline-secondary:hover {
  background-color: rgba(255, 255, 255, 0.06);
  border-color: var(--text-muted);
  color: var(--text-primary);
}

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.28);
}
.card-header {
  border-bottom: 1px solid var(--border);
  background-color: transparent;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  padding: 0.85rem 1rem;
}

/* ── Flash Alerts ───────────────────────────────────────────────────────── */
.alert {
  border-radius: var(--radius-sm);
  border-left-width: 3px;
  font-size: 0.875rem;
}
.alert-success {
  background-color: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.3);
  border-left-color: #10b981;
  color: #6ee7b7;
}
.alert-danger {
  background-color: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.3);
  border-left-color: #ef4444;
  color: #fca5a5;
}
.alert-warning {
  background-color: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.3);
  border-left-color: #f59e0b;
  color: #fcd34d;
}
.alert-info {
  background-color: var(--accent-muted);
  border-color: rgba(67, 97, 238, 0.3);
  border-left-color: var(--accent);
  color: #a5b4fc;
}

/* ── Forms ──────────────────────────────────────────────────────────────── */
.form-control,
.form-select {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}
.form-control:focus,
.form-select:focus {
  background-color: var(--bg-elevated);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
  color: var(--text-primary);
}
.form-control::placeholder { color: var(--text-muted); }
.form-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}
.form-control-color {
  width: 3rem;
  height: 2.25rem;
  padding: 0.2rem;
}
.form-check-input {
  background-color: var(--bg-elevated);
  border-color: var(--border);
}
.form-check-input:checked {
  background-color: var(--accent);
  border-color: var(--accent);
}
.form-check-input:focus {
  box-shadow: 0 0 0 3px var(--accent-muted);
  border-color: var(--accent);
}

/* ── Modals ─────────────────────────────────────────────────────────────── */
.modal-content {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.modal-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
}
.modal-footer {
  border-top: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
}
.modal-title {
  font-weight: 600;
  font-size: 0.95rem;
}

/* ── Tables ─────────────────────────────────────────────────────────────── */
.table {
  --bs-table-bg: transparent;
  --bs-table-striped-bg: rgba(255, 255, 255, 0.02);
  --bs-table-hover-bg: rgba(255, 255, 255, 0.04);
  --bs-table-border-color: var(--border);
  color: var(--text-primary);
  font-size: 0.875rem;
}
.table thead th {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  border-bottom-width: 1px;
  padding-bottom: 0.65rem;
}

/* ── Pagination ─────────────────────────────────────────────────────────── */
.pagination .page-link {
  background-color: var(--bg-surface);
  border-color: var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}
.pagination .page-link:hover,
.pagination .page-item.active .page-link {
  background-color: var(--accent-muted);
  border-color: var(--accent);
  color: var(--accent);
}
.pagination .page-item.disabled .page-link {
  background-color: var(--bg-surface);
  border-color: var(--border);
  color: var(--border);
}

/* ── Spinners ───────────────────────────────────────────────────────────── */
.spinner-border { color: var(--accent) !important; }

/* ── Section page heading ───────────────────────────────────────────────── */
.page-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* ─────────────────────────────────────────────────────────────────────────
   PHOTO CARDS (tag_photos.html — uniform square grid)
   ─────────────────────────────────────────────────────────────────────── */
.photo-card {
  position: relative;
  cursor: pointer;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: outline var(--transition);
}
.photo-card:hover {
  outline: 2px solid var(--accent);
  outline-offset: 0;
}
.photo-card.selected {
  outline: 2px solid var(--accent);
  outline-offset: 0;
}
.photo-thumb {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}
.photo-select-overlay {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 2;
}
.photo-select-overlay .form-check-input {
  width: 1.25em;
  height: 1.25em;
  cursor: pointer;
  border-color: rgba(255, 255, 255, 0.4);
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
}
.photo-select-overlay .form-check-input:checked {
  background-color: var(--accent);
  border-color: var(--accent);
}
.tag-badges {
  padding: 0.4rem 0.5rem;
}
.tag-badges .badge {
  font-size: 0.68rem;
  font-weight: 500;
  margin-bottom: 3px;
  padding: 0.25em 0.55em;
}

/* ── Floating batch action bar ─────────────────────────────────────────── */
.batch-bar {
  position: fixed;
  bottom: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.6rem 0.45rem 1rem;
  z-index: 1000;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}
.batch-bar-count {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  padding-right: 0.35rem;
}

/* ─────────────────────────────────────────────────────────────────────────
   GALLERY (masonry grid)
   ─────────────────────────────────────────────────────────────────────── */
.masonry-grid {
  opacity: 0;
  transition: opacity 0.2s ease;
}
.masonry-grid.is-ready { opacity: 1; }

/* Masonry item column widths — 2 → 3 → 4 → 5 → 6 cols */
.masonry-item {
  width: calc(50% - 6px);
  margin-bottom: 12px;
}
@media (min-width: 576px)  { .masonry-item { width: calc(33.333% - 8px); } }
@media (min-width: 768px)  { .masonry-item { width: calc(25% - 9px); } }
@media (min-width: 1200px) { .masonry-item { width: calc(20% - 9.6px); } }
@media (min-width: 1600px) { .masonry-item { width: calc(16.666% - 10px); } }

.gallery-card {
  cursor: pointer;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: outline var(--transition), transform var(--transition);
}
.gallery-card:hover {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  transform: translateY(-1px);
}
.gallery-card .gallery-thumb {
  width: 100%;
  display: block;
}
.gallery-card .card-body {
  padding: 0.5rem 0.6rem;
}

/* ── Tag filter bar ─────────────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.75rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}
.tag-filter-btn {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background-color: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition), background-color var(--transition), border-color var(--transition);
  line-height: 1.4;
}
.tag-filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}
.tag-filter-btn.active {
  color: #fff !important;
  border-color: transparent !important;
}

/* ── Filter mode toggle ─────────────────────────────────────────────────── */
.btn-group .btn-check + .btn {
  font-size: 0.78rem;
  padding: 0.28rem 0.65rem;
}
.btn-group .btn-check:checked + .btn-outline-primary {
  background-color: var(--accent-muted);
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Lightbox ───────────────────────────────────────────────────────────── */
#lightbox .modal-content {
  background-color: #08080f;
  border-color: var(--border);
}
.lightbox-layout {
  display: flex;
  min-height: 0;
}
.lightbox-image-col {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  padding: 0.5rem;
  min-width: 0;
}
.lightbox-image-col img {
  max-height: 80vh;
  max-width: 100%;
  object-fit: contain;
  display: block;
}
.lightbox-meta-col {
  flex: 0 0 240px;
  width: 240px;
  overflow-y: auto;
  padding: 1rem 1.25rem;
  border-left: 1px solid var(--border);
  background: var(--bg-surface);
}
@media (max-width: 767px) {
  .lightbox-layout {
    flex-direction: column;
  }
  .lightbox-meta-col {
    flex: none;
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 220px;
  }
}
.photo-meta-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 0.75rem;
  margin: 0;
  font-size: 0.8rem;
}
.photo-meta-list dt {
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}
.photo-meta-list dd {
  margin: 0;
  color: var(--text-primary);
  word-break: break-word;
}
.photo-meta-list a {
  color: var(--accent);
  text-decoration: none;
}
.photo-meta-list a:hover {
  text-decoration: underline;
}
#lightbox-tags .badge {
  font-size: 0.8rem;
}

/* ─────────────────────────────────────────────────────────────────────────
   LOGIN PAGE
   ─────────────────────────────────────────────────────────────────────── */
.login-page {
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}
.login-card {
  width: 100%;
  max-width: 380px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
}
.login-logo {
  max-width: 240px;
  height: auto;
  display: block;
  margin: 0 auto 1.75rem;
}
.login-card .tagline {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  line-height: 1.6;
}
.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  width: 100%;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color var(--transition), border-color var(--transition);
}
.btn-google:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--text-muted);
  color: var(--text-primary);
}

/* ─────────────────────────────────────────────────────────────────────────
   IMPORT PAGE
   ─────────────────────────────────────────────────────────────────────── */
.import-page {
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 2rem;
}
.import-card {
  width: 100%;
  max-width: 520px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
}
.import-state-icon {
  font-size: 2.75rem;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}
.import-state-icon.success { color: #10b981; }
.import-state-icon.danger  { color: #ef4444; }

/* Import tabs */
.import-tabs {
  border-bottom-color: var(--border);
}
.import-tabs .nav-link {
  color: var(--text-muted);
  border: none;
  border-bottom: 2px solid transparent;
  background: none;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  transition: color var(--transition);
}
.import-tabs .nav-link:hover { color: var(--text-primary); }
.import-tabs .nav-link.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: none;
}

/* Drop zone */
.upload-dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.5rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.upload-dropzone:hover,
.upload-dropzone:focus,
.upload-dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(67, 97, 238, 0.06);
  outline: none;
}
.upload-drop-icon {
  font-size: 2.5rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.75rem;
}

/* Selected file list */
.upload-file-list {
  margin-top: 1rem;
  text-align: left;
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}
.upload-file-row {
  display: flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--border);
}
.upload-file-row:last-child { border-bottom: none; }
.upload-file-name { min-width: 0; }
.upload-file-size { white-space: nowrap; font-size: 0.75rem; }
.btn-remove-file {
  background: none;
  border: none;
  padding: 0 0.15rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  flex-shrink: 0;
  transition: color var(--transition);
}
.btn-remove-file:hover { color: #ef4444; }

/* ─────────────────────────────────────────────────────────────────────────
   TAG MANAGEMENT PAGE
   ─────────────────────────────────────────────────────────────────────── */
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.5rem 0.3rem 0.55rem;
  font-size: 0.8rem;
}
.tag-chip .tag-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.tag-chip .btn-icon {
  background: none;
  border: none;
  padding: 0 0.1rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition);
  font-size: 0.75rem;
}
.tag-chip .btn-icon:hover { color: var(--text-primary); }
.tag-chip .btn-icon.btn-delete-icon:hover { color: #ef4444; }

/* ── Photo delete button ────────────────────────────────────────────────── */
.photo-delete-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(3px);
  border: none;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.7);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition), color var(--transition), background-color var(--transition);
}
.photo-card:hover .photo-delete-btn {
  opacity: 1;
}
.photo-delete-btn:hover {
  background-color: rgba(239, 68, 68, 0.85);
  color: #fff;
}

/* ── Text utilities ─────────────────────────────────────────────────────── */
.text-muted { color: var(--text-muted) !important; }