/* ==========================================================================
   Cloud Gallery - Modern, Sleek, Ultra-Fast Design System
   Zero-Dependency Pure CSS | Apple / Vercel Aesthetic
   ========================================================================== */

:root {
  /* Dark Theme Palette (Default) */
  --bg-base: #080b11;
  --bg-primary: #0d121d;
  --bg-secondary: #141c2e;
  --bg-tertiary: #1b263e;
  --bg-card: rgba(19, 27, 45, 0.72);
  --bg-card-hover: rgba(26, 37, 62, 0.9);
  --bg-input: #0f1626;
  --bg-glass: rgba(13, 18, 29, 0.82);
  --bg-skeleton: #182236;
  --skeleton-shine: rgba(255, 255, 255, 0.06);

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.13);
  --border-strong: rgba(255, 255, 255, 0.22);
  --border-focus: #6366f1;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-dark: #4f46e5;
  --accent-glow: rgba(99, 102, 241, 0.28);
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --accent-subtle: rgba(99, 102, 241, 0.14);

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.14);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.14);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.14);
  --info: #38bdf8;
  --info-bg: rgba(56, 189, 248, 0.14);

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px -2px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 12px 32px -4px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 28px -4px var(--accent-glow);

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --nav-height: 64px;
}

[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-primary: #ffffff;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-input: #f8fafc;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-skeleton: #e2e8f0;
  --skeleton-shine: rgba(255, 255, 255, 0.6);

  --border-subtle: rgba(0, 0, 0, 0.07);
  --border-medium: rgba(0, 0, 0, 0.12);
  --border-strong: rgba(0, 0, 0, 0.2);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px -2px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px -4px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 24px -2px rgba(99, 102, 241, 0.18);
  --accent-subtle: rgba(99, 102, 241, 0.08);
}

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

html, body {
  width: 100%;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-base);
  background-image: 
    radial-gradient(circle at 10% 10%, rgba(99, 102, 241, 0.09) 0%, transparent 40%),
    radial-gradient(circle at 90% 90%, rgba(139, 92, 246, 0.07) 0%, transparent 45%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  outline: none;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--accent);
}

/* Lucide Icon Alignment */
.lucide {
  display: inline-flex;
  vertical-align: middle;
  flex-shrink: 0;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   Layout & Sticky Glass Navbar
   ========================================================================== */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  padding: 0 28px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  justify-self: start;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition-bounce);
}

.nav-brand:hover .brand-icon {
  transform: scale(1.06) rotate(-2deg);
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.4px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-tabs {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2);
  justify-self: center;
}

.nav-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.nav-tab-btn.active {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

[data-theme="dark"] .nav-tab-btn.active {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

[data-theme="light"] .nav-tab-btn.active {
  background: #ffffff;
  color: var(--accent);
}

/* Zero-Flicker Container Display Rules */
#view-upload, #view-gallery, #view-settings {
  display: none !important;
}

html:not([data-tab]) #view-upload,
html[data-tab="upload"] #view-upload {
  display: flex !important;
}

html[data-tab="gallery"] #view-gallery {
  display: flex !important;
}

html[data-tab="settings"] #view-settings {
  display: flex !important;
}

.nav-tab-btn.active,
[data-tab="upload"] .nav-tab-btn[data-tab="upload"],
[data-tab="gallery"] .nav-tab-btn[data-tab="gallery"],
[data-tab="settings"] .nav-tab-btn[data-tab="settings"] {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

[data-theme="dark"] .nav-tab-btn.active,
[data-theme="dark"][data-tab="upload"] .nav-tab-btn[data-tab="upload"],
[data-theme="dark"][data-tab="gallery"] .nav-tab-btn[data-tab="gallery"],
[data-theme="dark"][data-tab="settings"] .nav-tab-btn[data-tab="settings"] {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

[data-theme="light"] .nav-tab-btn.active,
[data-theme="light"][data-tab="upload"] .nav-tab-btn[data-tab="upload"],
[data-theme="light"][data-tab="gallery"] .nav-tab-btn[data-tab="gallery"],
[data-theme="light"][data-tab="settings"] .nav-tab-btn[data-tab="settings"] {
  background: #ffffff;
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
}

.theme-icon-sun,
.theme-icon-moon {
  display: none;
}

[data-theme="dark"] .theme-icon-sun {
  display: block;
}

[data-theme="light"] .theme-icon-moon {
  display: block;
}

#auth-status-btn {
  display: none;
}

html[data-auth="valid"] #auth-status-btn,
html[data-auth="login"] #auth-status-btn {
  display: inline-flex !important;
}

.quota-badge:empty {
  display: none;
}

.quota-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quota-badge:hover {
  border-color: var(--border-medium);
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.main-content {
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 24px 60px;
}

/* ==========================================================================
   Buttons, Inputs, Selects
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 2px 10px -1px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}
.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-medium);
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.2);
}
.btn-danger:hover {
  background: var(--danger);
  color: #ffffff;
}

.btn-sm {
  padding: 5px 12px;
  font-size: 12px;
  border-radius: var(--radius-sm);
}

.btn-icon-only {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-sm);
}

.input-group {
  display: flex;
  align-items: center;
  position: relative;
}

.input {
  width: 100%;
  padding: 8px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 13px;
  transition: all var(--transition-fast);
}

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

.input-search {
  padding-left: 36px;
}

.input-icon-left {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
  pointer-events: none;
  display: flex;
  align-items: center;
}

.select {
  padding: 8px 32px 8px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 13px;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

#upload-channel-select {
  width: 180px;
  min-width: 180px;
  max-width: 180px;
}

#upload-name-select {
  width: 170px;
  min-width: 170px;
  max-width: 170px;
}

#gallery-channel-filter {
  width: 145px;
  min-width: 145px;
  max-width: 145px;
}

/* ==========================================================================
   View 1: Upload Center
   ========================================================================== */
.upload-container {
  flex-direction: column;
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
}

.dropzone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 290px;
  padding: 44px 24px;
  background: var(--bg-card);
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  overflow: hidden;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
  transform: scale(1.006);
}

.dropzone-icon {
  width: 68px;
  height: 68px;
  margin-bottom: 18px;
  border-radius: var(--radius-xl);
  background: var(--accent-subtle);
  color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-bounce);
}

.dropzone:hover .dropzone-icon {
  transform: translateY(-4px) scale(1.08);
}

.dropzone-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.dropzone-hint {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.dropzone-actions {
  display: flex;
  gap: 12px;
}

/* Upload Options Bar */
.upload-options-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
}

.upload-options-left, .upload-options-right {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.toggle-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
}

.toggle-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.toggle-chip input[type="checkbox"] {
  accent-color: var(--accent);
}

/* Upload Progress Queue */
.upload-queue {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.queue-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.queue-progress-bar {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  background: var(--accent-gradient);
  transition: width 0.2s ease;
}

.queue-thumb {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
}

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

.queue-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}

.queue-meta {
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  gap: 12px;
}

/* Upload Results Section */
.upload-results-section {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 10px;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.results-title {
  font-size: 15px;
  font-weight: 700;
}

.results-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px);
}

.result-card-top {
  display: flex;
  align-items: center;
  gap: 14px;
}

.result-preview {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  object-fit: cover;
  background: var(--bg-secondary);
  flex-shrink: 0;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
}

.result-details {
  flex: 1;
  min-width: 0;
}

.result-filename {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.result-copy-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

/* ==========================================================================
   View 2: Gallery & File Explorer (Speed & Fluidity)
   ========================================================================== */
.gallery-container {
  flex-direction: column;
  gap: 18px;
}

.gallery-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
}

.toolbar-left {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  flex: 1;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.crumb-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.crumb-item:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.crumb-separator {
  color: var(--text-muted);
}

/* Sticky Floating Batch Action Bar */
.batch-action-bar {
  position: sticky;
  top: 72px;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--accent);
  box-shadow: var(--shadow-glow);
  border-radius: var(--radius-lg);
  animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.batch-left {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-light);
}

.batch-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Shimmer Skeleton Placeholder for Instant Perception */
@keyframes skeleton-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.skeleton-card {
  height: 230px;
  background: var(--bg-skeleton);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.skeleton-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(90deg, transparent, var(--skeleton-shine), transparent);
  animation: skeleton-shimmer 1.4s infinite;
}

/* Files Grid View */
.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.file-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.file-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
  background: var(--bg-card-hover);
}

.file-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.file-card-thumb-wrap {
  position: relative;
  width: 100%;
  padding-top: 68%;
  background: var(--bg-secondary);
  overflow: hidden;
}

.file-card-thumb {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.file-card:hover .file-card-thumb {
  transform: scale(1.05);
}

.file-card-fallback {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: 8px;
}

.file-card-checkbox {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 3;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-sm);
  accent-color: var(--accent);
  cursor: pointer;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.file-card:hover .file-card-checkbox, .file-card.selected .file-card-checkbox {
  opacity: 1;
}

.file-card-type-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  color: #ffffff;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
}

.file-card-body {
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.file-card-title {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
}

.file-card-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  padding-top: 6px;
  border-top: 1px solid var(--border-subtle);
  margin-top: 4px;
}

/* File Table View */
.files-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow-x: auto;
}

.files-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

.files-table th {
  padding: 12px 16px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  white-space: nowrap;
}

.files-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.files-table tr:hover td {
  background: var(--bg-card-hover);
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 11px;
  color: var(--text-muted);
}

/* Spin animation for refresh */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spin {
  display: inline-block;
  animation: spin 1s linear infinite;
}

/* ==========================================================================
   View 3: Settings & Quota
   ========================================================================== */
.settings-container {
  flex-direction: column;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.settings-card {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
}

.settings-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.settings-card-title {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.stat-box {
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ==========================================================================
   Modals & Lightbox
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 520px;
  overflow: hidden;
  transform: scale(0.96);
  transition: transform var(--transition-bounce);
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
  font-size: 15px;
  font-weight: 700;
}

.modal-body {
  padding: 22px;
  max-height: calc(85vh - 120px);
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 22px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
}

/* Full Preview Modal (Lightbox) */
.preview-modal-box {
  max-width: 1160px;
  width: 95vw;
  height: 86vh;
  display: flex;
  flex-direction: row;
}

.preview-media-pane {
  flex: 1;
  background: #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.preview-media-pane img,
.preview-media-pane video {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.preview-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preview-nav-btn:hover {
  background: rgba(99, 102, 241, 0.85);
  transform: translateY(-50%) scale(1.1);
}

.preview-nav-prev { left: 16px; }
.preview-nav-next { right: 16px; }

.preview-info-pane {
  width: 360px;
  background: var(--bg-primary);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 260px;
  animation: toastIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  transition: all var(--transition-fast);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(16px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.toast-success { border-left: 4px solid var(--success); }
.toast-error { border-left: 4px solid var(--danger); }
.toast-info { border-left: 4px solid var(--accent); }

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 768px) {
  .navbar {
    padding: 0 16px;
  }
  .nav-tabs {
    position: fixed;
    bottom: 14px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    box-shadow: var(--shadow-lg);
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
  }
  .preview-modal-box {
    flex-direction: column;
    height: 90vh;
  }
  .preview-info-pane {
    width: 100%;
    height: 50%;
    border-left: none;
    border-top: 1px solid var(--border-subtle);
  }
  .files-grid, .skeleton-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
  }
}