@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Sora:wght@600;700&display=swap');

:root {
  --bg-primary: #09090b;
  --bg-surface: #131216;
  --bg-elevated: #1a1920;
  --bg-hover: #201f27;
  --bg-card: linear-gradient(160deg, rgba(26,25,32,0.9), rgba(19,18,22,0.95));
  --accent: #f97316;
  --accent-hover: #fb923c;
  --accent-glow: rgba(249,115,22,0.15);
  --accent-subtle: rgba(249,115,22,0.07);
  --text-primary: #ededf0;
  --text-secondary: rgba(255,255,255,0.55);
  --text-dim: rgba(255,255,255,0.32);
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.14);
  --success: #34d399;
  --danger: #f87171;
  --danger-hover: rgba(248,113,113,0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --transition: 180ms ease;
  --transition-slow: 400ms cubic-bezier(0.16,1,0.3,1);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Sora', system-ui, sans-serif;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.55;
  min-height: 100vh;
}

::selection { background: rgba(249,115,22,0.3); color: #fff; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ==================== LOGIN ==================== */

.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1.5rem;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(249,115,22,0.06), transparent),
    var(--bg-primary);
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem 2rem;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0; left: 20%; right: 20%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  border-radius: 1px;
}

.login-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.login-logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent), #fb923c);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: #fff;
  font-weight: 700;
  box-shadow: 0 2px 12px rgba(249,115,22,0.3);
}

.login-logo-text {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.login-form { display: flex; flex-direction: column; gap: 0.875rem; }

.input-group { position: relative; }

.input-group input {
  width: 100%;
  padding: 0.8rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group input::placeholder { color: var(--text-dim); }

.btn-primary {
  width: 100%;
  padding: 0.8rem 1.5rem;
  background: linear-gradient(135deg, var(--accent), #fb923c);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(249,115,22,0.25);
}

.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(249,115,22,0.35); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

.login-error {
  color: var(--danger);
  font-size: 0.82rem;
  text-align: center;
  min-height: 1.25rem;
}

/* ==================== DASHBOARD ==================== */

.dashboard { display: none; min-height: 100vh; }
.dashboard.active { display: block; }

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(9,9,11,0.75);
  backdrop-filter: blur(16px) saturate(1.5);
  border-bottom: 1px solid var(--border);
  padding: 0 1.25rem;
  height: 52px;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-right: auto;
}

.header-logo {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--accent), #fb923c);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: #fff;
  font-weight: 700;
}

.header-title {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.header-storage {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.header-storage-bar {
  width: 80px;
  height: 3px;
  background: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
}

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

/* Session countdown timer */
.session-timer {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.55rem 0.2rem 0.2rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all var(--transition-slow);
}

.session-ring {
  width: 26px;
  height: 26px;
  transform: rotate(-90deg);
  flex-shrink: 0;
}

.session-ring-bg {
  fill: none;
  stroke: rgba(255,255,255,0.06);
  stroke-width: 2.5;
}

.session-ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.5;
  stroke-linecap: round;
  transition: stroke 0.6s ease;
}

.session-timer-info {
  display: flex;
  flex-direction: column;
  line-height: 1;
  gap: 1px;
}

.session-timer-label {
  font-size: 0.55rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.session-timer-time {
  font-size: 0.78rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  transition: color 0.6s ease;
}

.session-timer.warning {
  border-color: rgba(249,115,22,0.2);
  background: rgba(249,115,22,0.05);
}
.session-timer.warning .session-ring-fill { stroke: var(--accent); }
.session-timer.warning .session-timer-time { color: var(--accent); }

.session-timer.critical {
  border-color: rgba(248,113,113,0.25);
  background: rgba(248,113,113,0.05);
  animation: timer-pulse 1.5s ease-in-out infinite;
}
.session-timer.critical .session-ring-fill { stroke: var(--danger); }
.session-timer.critical .session-timer-time { color: var(--danger); }

@keyframes timer-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.65; }
}

.btn-logout {
  padding: 0.35rem 0.7rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-logout:hover {
  background: var(--danger-hover);
  color: var(--danger);
  border-color: rgba(248,113,113,0.25);
}

/* ==================== STATS ==================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  padding: 1.25rem 1.25rem 0;
  max-width: 1200px;
  margin: 0 auto;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.stat-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.stat-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.stat-sub {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.15rem;
}

.storage-bar {
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.04);
  border-radius: 3px;
  margin-top: 0.65rem;
  overflow: hidden;
}

.storage-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #fb923c);
  border-radius: 3px;
  transition: width 0.5s ease;
}

.storage-fill.warning { background: linear-gradient(90deg, #f59e0b, #ef4444); }
.storage-fill.critical { background: linear-gradient(90deg, #ef4444, #dc2626); }

/* ==================== FILE MANAGER ==================== */

.file-manager {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  padding: 0.875rem 0 0.625rem;
  font-size: 0.82rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.breadcrumb::-webkit-scrollbar { display: none; }

.breadcrumb-item {
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
  font-weight: 500;
}

.breadcrumb-item:hover {
  color: var(--accent);
  background: var(--accent-subtle);
}

.breadcrumb-item.active {
  color: var(--text-primary);
  cursor: default;
}

.breadcrumb-item.active:hover { background: transparent; color: var(--text-primary); }

.breadcrumb-sep {
  color: var(--text-dim);
  font-size: 0.65rem;
  margin: 0 0.1rem;
  opacity: 0.5;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.btn-tool {
  padding: 0.5rem 0.9rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-tool:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.btn-upload {
  background: linear-gradient(135deg, var(--accent), #fb923c);
  border: none;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 1px 6px rgba(249,115,22,0.2);
}

.btn-upload:hover {
  opacity: 0.92;
  background: linear-gradient(135deg, var(--accent), #fb923c);
  box-shadow: 0 2px 10px rgba(249,115,22,0.3);
}

.search-input {
  margin-left: auto;
  padding: 0.5rem 0.8rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.78rem;
  width: 220px;
  outline: none;
  transition: all var(--transition);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  width: 260px;
}

.search-input::placeholder { color: var(--text-dim); }

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  color: var(--text-dim);
  transition: all var(--transition);
  margin-bottom: 0.75rem;
  display: none;
}

.drop-zone.visible { display: block; }

.drop-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-subtle);
  color: var(--accent);
}

.drop-zone-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.drop-zone-text { font-size: 0.82rem; font-weight: 500; }

/* ==================== FILE TABLE ==================== */

.file-table {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-surface);
}

.file-table-header {
  display: grid;
  grid-template-columns: 40px 1fr 90px 120px 160px;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.file-row {
  display: grid;
  grid-template-columns: 40px 1fr 90px 120px 160px;
  gap: 0.75rem;
  padding: 0.55rem 1rem;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  transition: background var(--transition);
  cursor: default;
}

.file-row:last-child { border-bottom: none; }
.file-row:hover { background: var(--bg-hover); }

.file-row.folder { cursor: pointer; }
.file-row.folder:hover { background: var(--accent-subtle); }

.file-row.drag-over {
  background: var(--accent-subtle);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.file-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  flex-shrink: 0;
}

.file-icon.folder-icon {
  background: var(--accent-subtle);
  color: var(--accent);
}

.file-name {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-name-input {
  background: var(--bg-primary);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.84rem;
  padding: 0.25rem 0.5rem;
  outline: none;
  width: 100%;
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.file-size {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.file-date {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.file-actions {
  display: flex;
  gap: 0.2rem;
  justify-content: flex-end;
}

.btn-action {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.82rem;
  transition: all var(--transition);
}

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

.btn-action.danger:hover {
  background: var(--danger-hover);
  border-color: rgba(248,113,113,0.2);
  color: var(--danger);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-dim);
}

.empty-state-icon { font-size: 2.5rem; margin-bottom: 0.75rem; opacity: 0.35; }
.empty-state-text { font-size: 0.9rem; font-weight: 500; color: var(--text-secondary); }
.empty-state-sub { font-size: 0.78rem; color: var(--text-dim); margin-top: 0.3rem; }

/* ==================== UPLOAD BAR ==================== */

.upload-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(19,18,22,0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  z-index: 100;
  display: none;
  max-height: 200px;
  overflow-y: auto;
}

.upload-bar.active { display: block; }

.upload-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

.upload-item:last-child { border-bottom: none; }

.upload-name {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-primary);
  flex-shrink: 0;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.upload-progress-bar {
  flex: 1;
  height: 3px;
  background: rgba(255,255,255,0.04);
  border-radius: 2px;
  overflow: hidden;
}

.upload-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.2s linear;
}

.upload-progress-fill.done { background: var(--success); }

.upload-info {
  font-size: 0.7rem;
  color: var(--text-dim);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.btn-cancel-upload {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.2rem;
  transition: color var(--transition);
}

.btn-cancel-upload:hover { color: var(--danger); }

/* ==================== MODALS ==================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

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

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  width: 100%;
  max-width: 420px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modal-enter 250ms cubic-bezier(0.16,1,0.3,1);
}

@keyframes modal-enter {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 1.1rem;
  letter-spacing: -0.01em;
}

.modal-body { margin-bottom: 1.25rem; }

.modal-body input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.modal-body input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.modal-body p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.modal-footer {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.btn-modal {
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-modal-cancel:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.btn-modal-confirm {
  background: linear-gradient(135deg, var(--accent), #fb923c);
  border: none;
  color: #fff;
  box-shadow: 0 1px 4px rgba(249,115,22,0.2);
}

.btn-modal-confirm:hover { box-shadow: 0 2px 8px rgba(249,115,22,0.3); }

.btn-modal-danger {
  background: var(--danger);
  border: none;
  color: #fff;
}

.btn-modal-danger:hover { opacity: 0.9; }

/* Folder tree */
.folder-tree { list-style: none; padding: 0; }

.folder-tree li {
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  border: 1px solid transparent;
}

.folder-tree li:hover {
  background: var(--accent-subtle);
  color: var(--accent);
}

.folder-tree li.selected {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: rgba(249,115,22,0.2);
}

.folder-tree li .indent { display: inline-block; width: 1rem; }

/* ==================== TOAST ==================== */

.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  padding: 0.7rem 1.15rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.82rem;
  font-weight: 500;
  z-index: 300;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
  pointer-events: none;
  box-shadow: var(--shadow-md);
}

.toast.show { opacity: 1; transform: translateY(0); }
.toast.error { border-color: rgba(248,113,113,0.3); }
.toast.success { border-color: rgba(52,211,153,0.3); }
.toast.info { border-color: rgba(249,115,22,0.3); }

/* ==================== THUMBNAILS ==================== */

.file-icon .file-thumb {
  width: 36px;
  height: 36px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.file-icon .file-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 2px 10px rgba(249,115,22,0.2);
}

.file-icon .file-thumb-video {
  width: 36px;
  height: 36px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.file-icon .file-thumb-video::after {
  content: '\25B6';
  font-size: 0.75rem;
  color: var(--accent);
  transition: color var(--transition);
}

.file-icon .file-thumb-video:hover {
  background: var(--accent-subtle);
}

.file-icon .file-thumb-video:hover::after {
  color: var(--text-primary);
}

/* ==================== PREVIEW ==================== */

.preview-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  backdrop-filter: blur(12px);
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
}

.preview-overlay.active { display: flex; }

.preview-close {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 301;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.7);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.preview-close:hover {
  background: rgba(248,113,113,0.2);
  border-color: rgba(248,113,113,0.3);
  color: var(--danger);
}

.preview-content {
  max-width: 94vw;
  max-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-content img {
  max-width: 94vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.preview-content video {
  max-width: 94vw;
  max-height: 90vh;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  background: #000;
}

/* ==================== UTILITY ==================== */

.hidden-input { display: none; }
.hidden { display: none !important; }

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

@media (max-width: 640px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    padding: 0.75rem;
  }
  .stats-grid .stat-card:first-child {
    grid-column: span 2;
  }
  .file-manager { padding: 0 0.75rem 2rem; }
  .toolbar {
    gap: 0.375rem;
  }
  .toolbar .btn-tool { flex: 1; justify-content: center; }
  .search-input { margin-left: 0; width: 100%; flex: none; }
  .search-input:focus { width: 100%; }
  .file-table-header { display: none; }
  .file-row {
    grid-template-columns: 36px 1fr auto;
    grid-template-rows: auto auto;
    gap: 0.15rem 0.6rem;
    padding: 0.6rem 0.75rem;
  }
  .file-icon { grid-row: span 2; }
  .file-size, .file-date { display: none; }
  .file-actions { grid-column: 3; grid-row: span 2; flex-direction: column; gap: 0.15rem; }
  .header { padding: 0 0.75rem; gap: 0.5rem; }
  .header-storage { display: none; }
  .session-timer .session-timer-label { display: none; }
  .stat-value { font-size: 1.35rem; }
  .breadcrumb { padding: 0.5rem 0; font-size: 0.78rem; }
  .btn-action { width: 36px; height: 36px; font-size: 0.8rem; }
}

@media (min-width: 641px) and (max-width: 900px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); padding: 1rem; gap: 0.5rem; }
  .file-table-header { grid-template-columns: 40px 1fr 80px 160px; }
  .file-row { grid-template-columns: 40px 1fr 80px 160px; }
  .file-date { display: none; }
}