/* ==================================================================
   Void — Professional File Hosting
   ================================================================== */

/* ── 1. Custom Properties ──────────────────────────────────────────── */
:root {
  /* Colors */
  --sidebar-bg: #1a1d23;
  --sidebar-hover: #262a33;
  --sidebar-active: #2c313b;
  --sidebar-text: #a4a9b4;
  --sidebar-text-bright: #e4e6ea;
  --sidebar-border: #2a2e37;
  --sidebar-accent: #6366f1;
  --main-bg: #f5f6f8;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-muted: #6c757d;
  --border: #e2e5ea;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: #eef2ff;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: #fef2f2;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --star: #f59e0b;
  --star-empty: #d1d5db;
  --info-bg: #1e1f2b;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --sidebar-width: 220px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', Consolas, monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 0.875rem;
  --text-lg: 1rem;
  --text-xl: 1.125rem;
  --text-2xl: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.08);

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 2px;
  --radius-lg: 12px;

  /* Transitions */
  --transition-fast: 0.12s ease;
  --transition-normal: 0.2s ease;
}

/* ── 2. Reset & Base ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; overflow: hidden; }

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text);
  background: var(--main-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font-family: inherit; cursor: pointer; }
input, select { font-family: inherit; font-size: inherit; }

/* ── 3. App Layout ─────────────────────────────────────────────────── */
.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  border-right: 1px solid var(--sidebar-border);
  user-select: none;
}

.main-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xl);
  background: var(--main-bg);
}

/* ── 4. Sidebar ────────────────────────────────────────────────────── */
.sidebar-logo {
  padding: var(--space-lg) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-logo .logo-icon {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
  color: var(--sidebar-text-bright);
}

.sidebar-logo h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--sidebar-text-bright);
  letter-spacing: -0.01em;
}

.sidebar-nav {
  padding: var(--space-sm);
  border-bottom: 1px solid var(--sidebar-border);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-base);
  color: var(--sidebar-text);
  transition: background var(--transition-fast), color var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.nav-item:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-text-bright);
  text-decoration: none;
}

.nav-item.active {
  background: var(--sidebar-active);
  color: var(--sidebar-text-bright);
  font-weight: 500;
}

.nav-item .nav-icon {
  font-size: 1.1rem;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.nav-item .nav-badge {
  margin-left: auto;
  background: var(--sidebar-accent);
  color: #fff;
  font-size: var(--text-xs);
  padding: 1px 6px;
  border-radius: 10px;
  font-weight: 600;
}

/* Folder tree */
.sidebar-folders {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm);
}

.sidebar-folders-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--sidebar-text);
  opacity: 0.5;
  padding: var(--space-sm) var(--space-md);
  font-weight: 600;
}

.folder-tree { list-style: none; }
.folder-tree ul { list-style: none; }

.folder-tree-item a {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--sidebar-text);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.folder-tree-item a:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-text-bright);
  text-decoration: none;
}

.folder-tree-item a.active {
  background: var(--sidebar-active);
  color: var(--sidebar-text-bright);
}

.folder-tree-item .tree-icon { font-size: 0.9rem; flex-shrink: 0; }

/* Nested folders */
.folder-tree ul { padding-left: var(--space-lg); }

.sidebar-footer {
  padding: var(--space-sm);
  border-top: 1px solid var(--sidebar-border);
}

.sidebar-footer .nav-item { color: var(--sidebar-text); opacity: 0.7; }
.sidebar-footer .nav-item:hover { opacity: 1; }

/* ── 5. Breadcrumbs ─────────────────────────────────────────────────── */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  margin-bottom: var(--space-lg);
  font-size: var(--text-sm);
}

.breadcrumbs a {
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--accent);
  background: var(--accent-light);
  text-decoration: none;
}

.breadcrumbs .sep {
  color: var(--border);
  margin: 0 2px;
}

.breadcrumbs .current {
  color: var(--text);
  font-weight: 600;
  padding: 2px 6px;
}

/* ── 6. Toolbar ─────────────────────────────────────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.search-box {
  position: relative;
  flex: 1;
  min-width: 200px;
  max-width: 360px;
}

.search-box .search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: var(--text-base);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 8px 12px 8px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  font-size: var(--text-sm);
  color: var(--text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-box input::placeholder { color: #adb5bd; }

.filter-select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  font-size: var(--text-sm);
  color: var(--text);
  cursor: pointer;
  min-width: 130px;
}

.filter-select:focus {
  outline: none;
  border-color: var(--accent);
}

.toolbar-spacer { flex: 1; }

/* ── 7. Buttons ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast), opacity var(--transition-fast);
  white-space: nowrap;
}

.btn:hover { opacity: 0.9; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }

.btn-outline {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover { background: var(--main-bg); }

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

.btn-sm { padding: 4px 10px; font-size: var(--text-xs); }
.btn-icon {
  padding: 6px 8px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: var(--text-base);
}
.btn-icon:hover { background: var(--main-bg); border-color: var(--border); color: var(--text); }

/* ── 8. File Table ──────────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.table-card { overflow: hidden; }

.table-wrapper { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

thead th {
  position: sticky;
  top: 0;
  text-align: left;
  padding: 10px 14px;
  background: #fafbfc;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

thead th:hover { color: var(--text); }
thead th .sort-arrow { margin-left: 4px; font-size: 0.7rem; }
thead th.sorted { color: var(--accent); }

tbody td {
  padding: 9px 14px;
  border-bottom: 1px solid #f0f1f3;
  vertical-align: middle;
}

tbody tr:hover { background: #f8f9fc; }
tbody tr:last-child td { border-bottom: none; }
tbody tr.folder-row { cursor: pointer; }
tbody tr.folder-row:hover { background: #f0f2ff; }

.file-icon-cell { width: 28px; text-align: center; font-size: 1.2rem; }
.file-name-cell { max-width: 300px; }
.file-name-cell .file-link {
  color: var(--text);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
}
.file-name-cell .file-link:hover { color: var(--accent); text-decoration: underline; }
.search-path {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-left: 4px;
  opacity: 0.7;
}

.file-name-cell .folder-link {
  color: var(--accent);
  font-weight: 500;
  text-decoration: none;
}
.file-name-cell .folder-link:hover { text-decoration: underline; }

.col-size { white-space: nowrap; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.col-date { white-space: nowrap; color: var(--text-muted); font-size: var(--text-xs); }
.col-actions { white-space: nowrap; text-align: right; }
.col-fav { width: 36px; text-align: center; }

.fav-btn {
  background: none; border: none; cursor: pointer;
  font-size: 1rem; padding: 2px 4px; border-radius: var(--radius-sm);
  transition: transform var(--transition-fast);
  line-height: 1;
}
.fav-btn:hover { transform: scale(1.2); }
.fav-btn.is-fav { color: var(--star); }
.fav-btn:not(.is-fav) { color: var(--star-empty); }

/* ── 9. Empty State ─────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 3rem; margin-bottom: var(--space-md); opacity: 0.5; }
.empty-state p { font-size: var(--text-base); }

/* ── 10. Upload Progress Bar ────────────────────────────────────────── */
.upload-progress {
  margin-top: 1rem;
  width: 100%;
}

.upload-progress-track {
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.upload-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #818cf8);
  border-radius: 4px;
  width: 0%;
  transition: width 0.3s ease;
}

.upload-progress-label {
  margin-top: 6px;
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-align: center;
}

/* ── 10b. Upload Zone ────────────────────────────────────────────────── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: border-color var(--transition-normal), background var(--transition-normal);
  cursor: pointer;
  margin-bottom: var(--space-lg);
  display: none;
}
.upload-zone.visible { display: block; }
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-light);
}
.upload-zone .upload-icon { font-size: 2.5rem; margin-bottom: var(--space-sm); }
.upload-zone p { color: var(--text-muted); font-size: var(--text-sm); }
.upload-zone .upload-btn-row { margin-top: var(--space-md); }
.upload-zone input[type="file"] { display: none; }

/* ── 11. Info Panel ──────────────────────────────────────────────────── */
.info-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.3);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}
.info-overlay.open { opacity: 1; pointer-events: auto; }

.info-panel {
  position: fixed;
  top: 0; right: 0;
  width: 360px;
  height: 100%;
  background: var(--info-bg);
  color: #e4e6ea;
  z-index: 101;
  transform: translateX(100%);
  transition: transform var(--transition-normal) ease;
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0,0,0,0.3);
}
.info-panel.open { transform: translateX(0); }

.info-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid #2a2d38;
}
.info-panel-header h3 { font-size: var(--text-lg); font-weight: 600; color: #fff; }
.info-panel-close {
  background: none; border: none; color: #9ca3af; font-size: 1.3rem;
  cursor: pointer; padding: 4px 8px; border-radius: var(--radius-sm);
}
.info-panel-close:hover { color: #fff; background: #2a2d38; }

.info-panel-body { flex: 1; overflow-y: auto; padding: var(--space-lg); }

.info-section { margin-bottom: var(--space-lg); }
.info-section-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #9ca3af;
  margin-bottom: var(--space-xs);
  font-weight: 600;
}
.info-section-value {
  font-size: var(--text-base);
  color: #e4e6ea;
  word-break: break-all;
}

.info-preview {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-lg);
  background: #0f1015;
  display: flex; align-items: center; justify-content: center;
  min-height: 200px;
}
.info-preview img { max-width: 100%; max-height: 300px; object-fit: contain; }
.info-preview .preview-icon { font-size: 4rem; opacity: 0.4; }

.info-panel-footer {
  padding: var(--space-lg);
  border-top: 1px solid #2a2d38;
  display: flex;
  gap: var(--space-sm);
}

/* ── 12. Flash Messages ──────────────────────────────────────────────── */
.flash-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 400px;
}

.flash {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-lg);
  animation: flashIn 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.flash-error { background: var(--danger-light); color: #991b1b; border: 1px solid #fecaca; }
.flash-success { background: var(--success-light); color: #065f46; border: 1px solid #a7f3d0; }

.flash-close {
  margin-left: auto;
  background: none; border: none;
  cursor: pointer; font-size: 1rem;
  opacity: 0.5; padding: 0 2px;
}
.flash-close:hover { opacity: 1; }

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

/* ── 13. Modal (New Folder, Rename) ──────────────────────────────────── */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.4);
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition-normal);
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }

.modal {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xl);
  width: 400px;
  max-width: 90vw;
}

.modal h3 { margin-bottom: var(--space-lg); font-size: var(--text-lg); }

.modal .form-group { margin-bottom: var(--space-md); }

.modal .form-group label {
  display: block;
  margin-bottom: 4px;
  font-size: var(--text-sm);
  font-weight: 500;
}

.modal .form-group input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
}

.modal .form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.modal .form-error {
  font-size: var(--text-xs);
  color: var(--danger);
  margin-top: 4px;
  display: none;
}

.modal-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
  margin-top: var(--space-lg);
}

/* ── 14. Login Page ──────────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1d23 0%, #2d3140 100%);
  padding: 1rem;
}

.login-card {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  padding: 2.5rem 2rem;
  width: 380px;
  max-width: 100%;
  text-align: center;
}

.login-card .login-logo {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--space-md);
  color: var(--accent);
}

.login-card h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: 4px;
}

.login-card .login-subtitle {
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
  font-size: var(--text-sm);
}

.login-card .form-group {
  margin-bottom: var(--space-lg);
  text-align: left;
}

.login-card .form-group label {
  display: block;
  margin-bottom: 4px;
  font-size: var(--text-sm);
  font-weight: 500;
}

.login-card .form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast);
}

.login-card .form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.login-card .btn { width: 100%; padding: 10px; font-size: var(--text-base); }

.login-card .login-error {
  background: var(--danger-light);
  color: #991b1b;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: var(--text-sm);
}

/* ── 15. Error Page ──────────────────────────────────────────────────── */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--main-bg);
}

.error-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  text-align: center;
  max-width: 440px;
}

.error-card h1 { font-size: var(--text-2xl); margin-bottom: var(--space-md); }
.error-card p { color: var(--text-muted); margin-bottom: var(--space-xl); }

/* ── 16. Scrollbar ───────────────────────────────────────────────────── */
.sidebar::-webkit-scrollbar,
.main-content::-webkit-scrollbar,
.info-panel-body::-webkit-scrollbar { width: 5px; }

.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: #3a3d47; border-radius: 10px; }

.main-content::-webkit-scrollbar-track { background: transparent; }
.main-content::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 10px; }

.info-panel-body::-webkit-scrollbar-track { background: transparent; }
.info-panel-body::-webkit-scrollbar-thumb { background: #3a3d47; border-radius: 10px; }

/* ── 17. Loading ─────────────────────────────────────────────────────── */
.loading-row td {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

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

.spinner {
  display: inline-block;
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* ── 18. Code Preview ────────────────────────────────────────────────── */
.code-preview {
  display: block;
  background: #0d1117;
  min-height: auto;
  max-height: 400px;
  overflow: auto;
}

.code-header {
  padding: 6px 14px;
  background: #161b22;
  border-bottom: 1px solid #30363d;
  font-size: var(--text-xs);
  color: #8b949e;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  position: sticky;
  top: 0;
}

.code-block {
  margin: 0;
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.55;
  color: #e6edf3;
  white-space: pre-wrap;
  word-break: break-word;
  tab-size: 2;
}

/* ── 19. Drag Overlay ────────────────────────────────────────────────── */
.drag-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(99, 102, 241, 0.12);
  backdrop-filter: blur(2px);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.drag-overlay.active { opacity: 1; pointer-events: auto; }

.drag-overlay-content {
  text-align: center;
  background: var(--card-bg);
  border: 3px dashed var(--accent);
  border-radius: var(--radius-lg);
  padding: 3rem 4rem;
  box-shadow: var(--shadow-lg);
}

.drag-overlay-icon { font-size: 3rem; margin-bottom: var(--space-sm); }

.drag-overlay-content p {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--accent);
}

/* ── 20. Hamburger Menu ──────────────────────────────────────────────── */
.hamburger {
  display: none;
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 500;
  background: var(--sidebar-bg);
  color: var(--sidebar-text-bright);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 400;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.sidebar-overlay.open { opacity: 1; pointer-events: auto; }

/* ── 21. Mobile Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .hamburger { display: block; }
  .sidebar-overlay { display: block; }

  .app-layout { flex-direction: column; }

  .sidebar {
    position: fixed;
    top: 0; left: 0;
    height: 100%;
    z-index: 450;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 2px 0 16px rgba(0,0,0,0.3);
  }
  .sidebar.open { transform: translateX(0); }

  .main-content {
    padding: var(--space-md);
    padding-top: 50px;
  }

  /* Toolbar wraps */
  .toolbar {
    flex-wrap: wrap;
    gap: 6px;
  }
  .search-box {
    min-width: 140px;
    max-width: none;
    flex: 2;
  }
  .filter-select { min-width: 100px; flex: 1; }
  .toolbar-spacer { display: none; }
  .toolbar .btn { padding: 6px 10px; font-size: var(--text-xs); }

  /* Table responsive */
  .col-date { display: none; }
  thead th.col-date { display: none; }

  /* Info panel full-width */
  .info-panel { width: 100%; }

  /* Modal smaller */
  .modal { width: 95vw; padding: var(--space-lg); }

  /* Upload zone */
  .upload-zone { padding: 1.5rem 1rem; }
  .drag-overlay-content { padding: 2rem; margin: 1rem; }
  .drag-overlay-icon { font-size: 2rem; }

  /* Login card */
  .login-card { padding: 1.5rem; }

  /* Flash messages */
  .flash-container {
    top: 8px; right: 8px; left: 8px;
    max-width: none;
  }
}

/* ── 22. Full-Screen Viewer ─────────────────────────────────────────── */
.viewer-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.92);
  z-index: 500;
  display: flex;
  flex-direction: column;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease;
}
.viewer-overlay.open { opacity: 1; pointer-events: auto; }

.viewer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(0,0,0,0.6);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}

.viewer-title {
  color: #fff;
  font-size: var(--text-base);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 50%;
}

.viewer-actions { display: flex; gap: 8px; }

.viewer-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 16px;
}

.viewer-content img {
  max-width: 95%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.5);
}

.viewer-content video {
  max-width: 95%;
  max-height: 85vh;
  border-radius: 4px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.5);
}

.viewer-content audio {
  width: 400px;
  max-width: 90%;
}

.viewer-content iframe {
  width: 95%;
  height: 90vh;
  border: none;
  border-radius: 4px;
  background: #fff;
}

.viewer-content .viewer-code {
  width: 90%;
  max-width: 1000px;
  max-height: 90vh;
  overflow: auto;
  background: #0d1117;
  border-radius: 8px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.5);
}

.viewer-content .viewer-code-header {
  padding: 8px 16px;
  background: #161b22;
  border-bottom: 1px solid #30363d;
  font-size: var(--text-xs);
  color: #8b949e;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  position: sticky;
  top: 0;
}

.viewer-content .viewer-code pre {
  margin: 0;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #e6edf3;
  white-space: pre-wrap;
  word-break: break-word;
  tab-size: 2;
}

.viewer-content .viewer-icon {
  font-size: 6rem;
  opacity: 0.3;
  color: #fff;
}

/* ── 22b. Sidebar Usage Bar ─────────────────────────────────────────── */
.sidebar-usage {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--sidebar-border);
}

.usage-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--sidebar-text);
  opacity: 0.5;
  font-weight: 600;
  margin-bottom: 6px;
}

.usage-bar-track {
  height: 4px;
  background: #2a2e37;
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 4px;
}

.usage-bar-fill {
  height: 100%;
  background: var(--sidebar-accent);
  border-radius: 2px;
  transition: width 0.5s ease;
}

.usage-text {
  font-size: var(--text-xs);
  color: var(--sidebar-text);
}

/* ── 22c. Batch Toolbar ─────────────────────────────────────────────── */
.batch-toolbar {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 14px;
  background: var(--accent-light);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.batch-toolbar.visible { display: flex; }

.batch-count {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--accent);
  margin-right: auto;
}

/* ── 22d. View Toggle ───────────────────────────────────────────────── */
.btn-icon-only {
  width: 34px; height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}
.btn-icon-only:hover { background: var(--main-bg); }
.btn-icon-only.active { background: var(--accent-light); border-color: var(--accent); }

/* ── 22e. Grid View ─────────────────────────────────────────────────── */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
  padding: 4px 0;
}

.grid-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px;
  text-align: center;
  cursor: pointer;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  user-select: none;
}

.grid-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.grid-item.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent);
  background: var(--accent-light);
}

.grid-item .grid-thumb {
  width: 100%;
  height: 100px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: 6px;
  background: #f0f1f3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  overflow: hidden;
}

.grid-item .grid-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.grid-item .grid-name {
  font-size: var(--text-xs);
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  line-height: 1.4;
}

.grid-item .grid-meta {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.grid-item .grid-check {
  position: absolute;
  top: 6px;
  left: 6px;
  width: 20px; height: 20px;
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 4px;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
}

.grid-item.show-checks .grid-check,
.grid-item.selected .grid-check { display: flex; }
.grid-item.selected .grid-check { background: var(--accent); border-color: var(--accent); color: #fff; }

.grid-item .grid-fav {
  position: absolute;
  top: 6px;
  right: 6px;
  font-size: 1rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast);
  background: none; border: none; padding: 2px 4px; border-radius: 3px;
}
.grid-item:hover .grid-fav { opacity: 1; }

.grid-menu-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(0,0,0,0.5);
  color: #fff;
  border: none;
  border-radius: 3px;
  width: 22px; height: 22px;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
  line-height: 1;
  padding: 0;
  z-index: 2;
}
.grid-item:hover .grid-menu-btn { opacity: 1; }
.grid-item .grid-fav { right: 28px; }

/* Grid dropdown menu */
.grid-menu {
  position: fixed;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 600;
  min-width: 160px;
  padding: 4px;
  display: none;
}
.grid-menu.open { display: block; }

.grid-menu-item {
  display: block;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: none;
  font-size: var(--text-sm);
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  font-family: inherit;
}
.grid-menu-item:hover { background: var(--main-bg); }
.grid-menu-danger { color: var(--danger); }
.grid-menu-danger:hover { background: var(--danger-light); }

/* ── 22f. Table Checkboxes ──────────────────────────────────────────── */
.col-check { width: 36px; text-align: center; }
.col-check input[type="checkbox"] {
  width: 16px; height: 16px;
  cursor: pointer;
  accent-color: var(--accent);
}

tr.selected {
  background: var(--accent-light) !important;
}

/* ── 23. Drag & Drop States ─────────────────────────────────────────── */
tr.dragging {
  opacity: 0.4;
  background: var(--accent-light) !important;
}

tr.drop-target {
  background: #e0e7ff !important;
  outline: 2px dashed var(--accent);
  outline-offset: -2px;
}

.folder-tree-item.drop-target > a {
  background: #4338ca !important;
  color: #fff !important;
  outline: 2px dashed #818cf8;
  outline-offset: -1px;
}

@media (max-width: 480px) {
  .col-size { display: none; }
  thead th.col-size { display: none; }
  .col-actions { width: auto; }

  .btn { padding: 6px 10px; font-size: var(--text-xs); }
  .btn-sm { padding: 3px 7px; font-size: 0.7rem; }

  .breadcrumbs { font-size: var(--text-xs); }
}