/* ==========================================================================
   CSS Reset & Variables (Premium Light Theme)
   ========================================================================== */
:root {
  --bg-main: #f3f5f9;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-card-hover: rgba(255, 255, 255, 0.9);
  --bg-input: rgba(255, 255, 255, 0.95);
  
  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(0, 0, 0, 0.16);
  --border-primary: rgba(124, 58, 237, 0.3);
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dark: #94a3b8;
  
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-gradient: linear-gradient(135deg, #7c3aed 0%, #2563eb 100%);
  --primary-glow: rgba(124, 58, 237, 0.15);
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-gradient: linear-gradient(135deg, #f43f5e 0%, #e11d48 100%);
  --danger-glow: rgba(239, 68, 68, 0.15);
  
  --success: #10b981;
  --success-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
  
  --warning: #f59e0b;
  --warning-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  
  --glass-filter: blur(20px);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 32px 0 rgba(31, 38, 135, 0.06);
  --shadow-lg: 0 12px 48px 0 rgba(31, 38, 135, 0.12);
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', Menlo, Monaco, Consolas, monospace;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background: radial-gradient(at 0% 0%, rgba(219, 234, 254, 0.4) 0px, transparent 50%),
              radial-gradient(at 50% 0%, rgba(243, 232, 255, 0.6) 0px, transparent 50%),
              radial-gradient(at 100% 0%, rgba(221, 242, 248, 0.4) 0px, transparent 50%),
              #f5f7fb;
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.5;
}

/* ==========================================================================
   Background Glowing Orbs
   ========================================================================== */
.bg-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.bg-glow-1 {
  background: radial-gradient(circle, #a78bfa 0%, rgba(167,139,250,0) 70%);
  top: -100px;
  right: -100px;
}

.bg-glow-2 {
  background: radial-gradient(circle, #93c5fd 0%, rgba(147,197,253,0) 70%);
  bottom: -150px;
  left: -150px;
}

/* ==========================================================================
   App Container & Header
   ========================================================================== */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1600px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(243, 245, 249, 0.85);
  backdrop-filter: var(--glass-filter);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.logo-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #0f172a 30%, #6d28d9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-badge {
  font-size: 0.65rem;
  background: rgba(124, 58, 237, 0.08);
  color: #6d28d9;
  border: 1px solid rgba(124, 58, 237, 0.2);
  padding: 0.1rem 0.4rem;
  border-radius: 9999px;
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.active-bucket-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 10px;
  color: var(--text-main);
}

.active-bucket-info i {
  color: var(--success);
}

/* ==========================================================================
   Buttons & Inputs
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.625rem 1.25rem;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: #fff;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-gradient);
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.35);
}

.btn-secondary {
  background: rgba(0, 0, 0, 0.02);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--border-color-hover);
}

.btn-danger {
  background: var(--danger-gradient);
  box-shadow: 0 4px 14px var(--danger-glow);
}

.btn-danger:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.25);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-icon-only {
  padding: 0.625rem;
  width: 38px;
  height: 38px;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.btn-icon:hover {
  color: var(--text-main);
}

.cursor-pointer {
  cursor: pointer;
}

.hidden {
  display: none !important;
}

.flex-1 {
  flex: 1;
}

.justify-center {
  justify-content: center;
}

.align-start {
  align-items: flex-start;
}

/* ==========================================================================
   Independent Login Page Styling (login.html)
   ========================================================================== */
.body-login {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1.5rem;
}

.login-container {
  width: 100%;
  max-width: 360px;
  position: relative;
  z-index: 10;
  animation: modalScaleIn var(--transition-normal);
}

.login-card {
  background: rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 24px;
  padding: 2.25rem 1.75rem;
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  box-shadow: 0 24px 64px -16px rgba(31, 38, 135, 0.04), 0 0 1px 0 rgba(0, 0, 0, 0.05);
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.login-header .logo-icon {
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
}

.login-header h2 {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #0f172a 40%, #6d28d9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.login-footer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.75rem;
  color: var(--text-dark);
}

/* Input design with prefix icons */
.password-input-wrapper {
  position: relative;
}

.password-input-wrapper input {
  padding-right: 2.5rem;
}

.password-input-wrapper .btn-icon {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.875rem;
  z-index: 2;
}

.input-prefix-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dark);
  font-size: 0.9rem;
}

/* ==========================================================================
   Independent Settings Page Styling (settings.html)
   ========================================================================== */
.settings-page-card {
  width: 100%;
  max-width: 680px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-lg);
  margin: 0 auto;
}

.settings-card-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
}

.settings-card-header h2 {
  font-size: 1.35rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.settings-card-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.form-actions-settings {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  margin-top: 2rem;
}

/* ==========================================================================
   Explorer Area (Main dashboard)
   ========================================================================== */
.app-main {
  display: flex;
  flex: 1;
  position: relative;
}

.explorer-section {
  flex: 1;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  min-width: 0;
}

/* Top control bar */
.control-bar-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.02);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow-x: auto;
  white-space: nowrap;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
}

.breadcrumbs::-webkit-scrollbar {
  display: none; /* Chrome/Safari */
}

.breadcrumb-item {
  cursor: pointer;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb-item:hover {
  color: var(--text-main);
}

.breadcrumb-item.active {
  color: var(--primary);
  font-weight: 600;
  cursor: default;
}

.breadcrumb-item:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--text-dark);
  cursor: default;
}

.action-buttons-group {
  display: flex;
  gap: 0.75rem;
}

/* Search and Filters */
.filter-search-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  min-width: 280px;
  max-width: 480px;
}

.search-input-wrapper input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.625rem 1rem 0.625rem 2.5rem;
  border-radius: 10px;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.search-input-wrapper input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
  background: var(--bg-card-hover);
}

.search-icon {
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.search-input-wrapper .btn-icon {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
}

.filters-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-tags {
  display: flex;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid var(--border-color);
  padding: 0.25rem;
  border-radius: 10px;
  gap: 0.25rem;
}

.filter-tag {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.85rem;
  border-radius: 7px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.filter-tag:hover {
  color: var(--text-main);
}

.filter-tag.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.view-toggle {
  display: flex;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
}

.view-toggle .btn-icon {
  padding: 0.5rem;
  width: 36px;
  height: 36px;
  border-radius: 0;
  background: rgba(0, 0, 0, 0.01);
}

.view-toggle .btn-icon.active {
  background: rgba(0, 0, 0, 0.04);
  color: var(--text-main);
}

/* ==========================================================================
   Files Container (Grid & List View)
   ========================================================================== */
.files-container {
  display: grid;
  gap: 1.25rem;
  min-height: 400px;
  position: relative;
  align-content: start;
}

/* GRID VIEW */
.files-container.view-grid {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

/* LIST VIEW */
.files-container.view-list {
  grid-template-columns: 1fr;
}

/* File Card Items (Common) */
.file-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  position: relative;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.file-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 25px -5px rgba(31, 38, 135, 0.08), 0 8px 16px -8px var(--primary-glow);
}

/* Grid layout for file card */
.view-grid .file-card {
  flex-direction: column;
  aspect-ratio: 1 / 1.15;
}

.view-grid .file-preview-area {
  flex: 1;
  background: rgba(0, 0, 0, 0.02);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

.view-grid .file-preview-area img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.view-grid .file-card:hover .file-preview-area img {
  transform: scale(1.05);
}

.view-grid .icon-fallback {
  font-size: 2.75rem;
  color: var(--text-dark);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.view-grid .file-card:hover .icon-fallback {
  transform: scale(1.1);
  color: var(--text-muted);
}

.view-grid .file-info-area {
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-height: 70px;
}

.view-grid .file-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.view-grid .file-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* List layout for file card */
.view-list .file-card {
  flex-direction: row;
  align-items: center;
  padding: 0.75rem 1.25rem;
  gap: 1.25rem;
}

.view-list .file-preview-area {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.view-list .file-preview-area img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.view-list .icon-fallback {
  font-size: 1.35rem;
  color: var(--text-dark);
}

.view-list .file-info-area {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  min-width: 0;
  gap: 1.5rem;
}

.view-list .file-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 2;
  min-width: 0;
}

.view-list .file-meta {
  display: flex;
  flex: 3;
  justify-content: flex-end;
  gap: 3rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.view-list .file-size {
  width: 80px;
  text-align: right;
}

.view-list .file-date {
  width: 140px;
  text-align: right;
}

/* Card Actions (Hover Overlay) */
.card-actions-overlay {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: flex;
  gap: 0.35rem;
  opacity: 0;
  transform: translateY(-5px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 10;
}

.file-card:hover .card-actions-overlay {
  opacity: 1;
  transform: translateY(0);
}

.action-btn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.action-btn:hover {
  color: var(--text-main);
  border-color: var(--border-color-hover);
  transform: scale(1.05);
}

.action-btn.btn-delete-file:hover,
.action-btn.btn-delete-folder:hover {
  background: var(--danger-gradient);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 10px rgba(239, 68, 68, 0.2);
}

/* Folders styling */
.file-card.item-folder .icon-fallback {
  color: #f59e0b;
}

.file-card.item-folder:hover .icon-fallback {
  color: #d97706;
}

/* ==========================================================================
   Form Fields Group
   ========================================================================== */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-group label .required {
  color: var(--danger);
}

.form-group input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.625rem 0.875rem;
  border-radius: 8px;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.form-tip {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.45rem;
  line-height: 1.4;
}

.cors-help-card {
  background: rgba(0, 0, 0, 0.01);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
}

.cors-help-card h3 {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.cors-help-card p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.cors-help-card pre {
  background: #0f172a;
  padding: 0.75rem;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.cors-help-card code {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: #c084fc;
}

/* ==========================================================================
   Loading Skeletons, Empty States
   ========================================================================== */
.skeleton-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow: hidden;
  height: 240px;
  display: flex;
  flex-direction: column;
}

.skeleton-preview {
  flex: 1;
  background: linear-gradient(90deg, rgba(0,0,0,0.01) 25%, rgba(0,0,0,0.03) 50%, rgba(0,0,0,0.01) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

.skeleton-info {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skeleton-text {
  height: 12px;
  background: rgba(0, 0, 0, 0.04);
  border-radius: 4px;
}

.skeleton-text.short {
  width: 60%;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.5);
  border: 2px dashed var(--border-color);
  border-radius: 20px;
  max-width: 600px;
  margin: 2rem auto;
  box-shadow: var(--shadow-sm);
}

.empty-illustration {
  font-size: 4rem;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
  opacity: 0.7;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.empty-state p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  max-width: 400px;
}

/* Drag & Drop Overlay Zone */
.drop-zone {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(243, 245, 249, 0.95);
  backdrop-filter: blur(8px);
  border: 3px dashed var(--primary);
  border-radius: 20px;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-fast);
}

.drop-zone-content {
  text-align: center;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.drop-zone-content i {
  font-size: 5rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.upload-bounce {
  animation: bounce 1.5s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* ==========================================================================
   Modals & Lightboxes
   ========================================================================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-fast);
}

.modal-content {
  width: 460px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalScaleIn var(--transition-normal);
}

.glassmorphism {
  backdrop-filter: var(--glass-filter);
}

@keyframes modalScaleIn {
  from { transform: scale(0.92); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* ==========================================================================
   Lightbox (Big Media Preview)
   ========================================================================== */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(241, 243, 247, 0.96);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-fast);
}

.lightbox-close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(0, 0, 0, 0.08);
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 2010;
}

.lightbox-close-btn:hover {
  background: rgba(0, 0, 0, 0.1);
  transform: rotate(90deg);
}

/* 导航切换按钮常规样式 */
.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 72px;
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: 8px;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 2010;
}

.lightbox-nav-btn:hover {
  background: rgba(0, 0, 0, 0.08);
  color: var(--primary);
  transform: translateY(-50%) scale(1.05);
}

.lightbox-nav-btn.prev {
  left: 2rem;
}

.lightbox-nav-btn.next {
  right: 2rem;
}

.lightbox-content {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: row;
}

.lightbox-media-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  overflow: hidden;
}

.lightbox-media-container img {
  max-width: 100%;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  animation: scaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lightbox-media-container video {
  max-width: 100%;
  max-height: 85vh;
  outline: none;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
}

.lightbox-media-container audio {
  width: 400px;
  outline: none;
}

.lightbox-media-container .fallback-file-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.lightbox-media-container .fallback-file-icon i {
  font-size: 6rem;
  color: var(--text-dark);
}

.lightbox-sidebar {
  width: 420px;
  border-left: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.85);
  display: flex;
  flex-direction: column;
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-lg);
  z-index: 2005;
  animation: slideInRight var(--transition-normal);
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

.file-info-header {
  margin-bottom: 2rem;
}

.file-info-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  word-break: break-all;
  margin-bottom: 0.5rem;
}

.info-badge {
  font-size: 0.75rem;
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid var(--border-color);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  color: var(--text-muted);
}

.info-details-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.info-detail-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.info-detail-item .label {
  font-size: 0.775rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
}

.info-detail-item .val {
  font-size: 0.875rem;
  color: var(--text-main);
  word-break: break-all;
}

.info-detail-item .val.code-font {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: rgba(0, 0, 0, 0.04);
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  border: 1px solid rgba(0, 0, 0, 0.02);
}

.lightbox-actions {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

@keyframes scaleIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ==========================================================================
   Upload Progress Drawer
   ========================================================================== */
.upload-progress-drawer {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 360px;
  max-height: 400px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: var(--glass-filter);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 500;
  animation: slideInUp var(--transition-normal);
}

@keyframes slideInUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.upload-progress-drawer.minimized {
  max-height: 52px;
}

.upload-progress-drawer.minimized .upload-queue-list {
  display: none;
}

.drawer-header {
  padding: 0.875rem 1.25rem;
  background: rgba(0, 0, 0, 0.02);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drawer-header h3 {
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.drawer-controls {
  display: flex;
  gap: 0.5rem;
}

.upload-queue-list {
  padding: 0.5rem 1rem;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.upload-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

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

.upload-item-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.775rem;
  gap: 1rem;
}

.upload-item-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}

.upload-item-status {
  flex-shrink: 0;
  font-weight: 600;
}

.upload-item-status.status-uploading { color: var(--warning); }
.upload-item-status.status-success { color: var(--success); }
.upload-item-status.status-failed { color: var(--danger); }

.progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(0, 0, 0, 0.04);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--primary-gradient);
  border-radius: 9999px;
  transition: width 0.1s linear;
}

.upload-item-status.status-success ~ .progress-bar-container .progress-bar-fill {
  background: var(--success-gradient);
}

.upload-item-status.status-failed ~ .progress-bar-container .progress-bar-fill {
  background: var(--danger-gradient);
}

/* ==========================================================================
   Toast Notification System
   ========================================================================== */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 3000;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  width: 320px;
  padding: 1rem 1.25rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  backdrop-filter: var(--glass-filter);
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  animation: toastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transition: transform 0.25s, opacity 0.25s;
}

@keyframes toastIn {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.toast.toast-exit {
  transform: translateX(120%);
  opacity: 0;
}

.toast-icon {
  font-size: 1.15rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.toast-success {
  border-left: 3px solid var(--success);
}
.toast-success .toast-icon {
  color: var(--success);
}

.toast-error {
  border-left: 3px solid var(--danger);
}
.toast-error .toast-icon {
  color: var(--danger);
}

.toast-warn {
  border-left: 3px solid var(--warning);
}
.toast-warn .toast-icon {
  color: var(--warning);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.toast-msg {
  font-size: 0.775rem;
  color: var(--text-muted);
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-dark);
  cursor: pointer;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.toast-close:hover {
  color: var(--text-main);
}

/* ==========================================================================
   Responsive & Adaptive Media Queries (H5 Mobile deep tuning)
   ========================================================================== */
@media (max-width: 1024px) {
  .app-main {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  /* Permanently show action buttons in card overlay because hover doesn't work on mobile */
  .card-actions-overlay {
    opacity: 1;
    transform: translateY(0);
  }
  
  .action-btn {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(0, 0, 0, 0.12);
  }
}

@media (max-width: 640px) {
  body {
    background-color: #f1f3f7; /* Slightly darker shade on mobile */
  }

  .app-header {
    padding: 1rem;
  }

  .logo-text h1 {
    font-size: 1.1rem;
  }
  
  .logo-badge {
    display: none; /* Hide badge to save horizontal space */
  }

  .header-actions .active-bucket-info span {
    display: none; /* Hide text, icon only */
  }

  .explorer-section {
    padding: 1rem 0.75rem;
    gap: 1rem;
  }

  /* Control Top buttons fullwidth in two columns */
  .control-bar-top {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .action-buttons-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .action-buttons-group .btn {
    width: 100%;
    padding: 0.5rem;
    font-size: 0.8rem;
  }

  /* Search & filter full width */
  .filter-search-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .search-input-wrapper {
    max-width: 100%;
    min-width: 100%;
  }

  .filters-group {
    justify-content: space-between;
    gap: 0.5rem;
    flex-wrap: nowrap;
    width: 100%;
    overflow: hidden;
  }

  .filter-tags {
    flex: 1;
    overflow-x: auto;
    white-space: nowrap;
    display: flex;
    gap: 0.25rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
  }

  .filter-tags::-webkit-scrollbar {
    display: none; /* Safari/Chrome */
  }

  .filter-tag {
    flex-shrink: 0;
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
  }

  /* 2 columns compact grid view for mobile screens */
  .files-container.view-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.75rem;
  }

  .view-grid .file-card {
    aspect-ratio: 1 / 1.18;
  }

  .view-grid .file-preview-area {
    border-bottom: 1px solid rgba(0, 0, 0, 0.02);
  }

  .view-grid .file-preview-area img {
    object-position: center;
  }

  .view-grid .icon-fallback {
    font-size: 2rem;
  }

  .view-grid .file-info-area {
    padding: 0.65rem 0.5rem;
    min-height: 58px;
    gap: 0.15rem;
  }

  .view-grid .file-name {
    font-size: 0.8rem;
  }

  .view-grid .file-meta {
    font-size: 0.68rem;
  }

  /* List view adjustments */
  .view-list .file-card {
    padding: 0.5rem 0.75rem;
    gap: 0.75rem;
  }

  .view-list .file-info-area {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 0.15rem;
  }

  .view-list .file-name {
    width: 100%;
    font-size: 0.8rem;
  }

  .view-list .file-meta {
    width: 100%;
    justify-content: flex-start;
    gap: 1rem;
    font-size: 0.7rem;
  }

  .view-list .file-size,
  .view-list .file-date {
    width: auto;
    text-align: left;
  }

  /* Lightbox Mobile layout: 沉浸式全屏大图 + 底部悬浮胶囊仓 */
  .lightbox-content {
    flex-direction: column;
    height: 100dvh; /* 采用动态视口高度 */
    overflow: hidden;
    display: flex;
    position: relative;
  }

  .lightbox-media-container {
    height: 100dvh;
    padding: 1rem 1rem 7.2rem 1rem; /* 底部安全边距增加到 7.2rem，强制压缩大图最大可用高度 */
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.02);
  }

  .lightbox-media-container img,
  .lightbox-media-container video {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    margin-bottom: 2.2rem; /* 画面往上整体提拉 2.2rem，与底部悬浮舱彻底隔开 */
  }

  .lightbox-sidebar {
    position: absolute;
    bottom: 2.2rem; /* 提拉悬浮，完全避开手机底部虚拟栏和手势区 */
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 2.2rem); /* 左右留空 */
    max-width: 480px;
    height: 58px; /* 精巧胶囊高度 */
    border-radius: 29px; /* 极致圆角 */
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 0 1.25rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
  }

  .file-info-header {
    margin-bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
    max-width: 60%;
  }

  #lightbox-file-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
  }

  #lightbox-file-size.info-badge {
    background: none;
    border: none;
    padding: 0;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 400;
  }

  /* 隐藏多余的修改时间、类型和 R2 Key 等参数 */
  .info-details-list {
    display: none !important;
  }

  /* 改变操作按钮，把大按钮变成小巧图标按钮 */
  .lightbox-actions {
    display: flex;
    flex-direction: row;
    gap: 0.65rem;
    margin-top: 0;
    align-items: center;
    justify-content: flex-end;
  }

  /* 隐藏多余的复制代理链按钮，保留直链复制（分享）和下载 */
  #btn-lightbox-copy-signed {
    display: none !important;
  }

  /* 手机端隐藏浮动切换按钮，改用触控左右手势滑动切换 */
  .lightbox-nav-btn {
    display: none !important;
  }

  /* 手机端隐藏右上角 X 关闭按钮，改用直接点击大图区域关闭 */
  .lightbox-close-btn {
    display: none !important;
  }

  .lightbox-actions .btn {
    width: 38px;
    height: 38px;
    border-radius: 50% !important;
    padding: 0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 0.95rem !important;
    box-shadow: none !important;
    flex: none !important;
    transition: all var(--transition-fast) !important;
  }

  /* 隐藏文字，只留图标 */
  .lightbox-actions .btn span {
    display: none !important;
  }

  .lightbox-actions .btn i {
    margin: 0 !important;
  }

  /* 直链复制（分享）按钮：灰白磨砂 */
  #btn-lightbox-copy-public {
    background: rgba(0, 0, 0, 0.04) !important;
    border: 1px solid rgba(0, 0, 0, 0.06) !important;
    color: var(--text-main) !important;
  }

  /* 下载按钮：浅紫背景，紫色图标 */
  #btn-lightbox-download {
    background: var(--primary-light) !important;
    border: none !important;
    color: var(--primary) !important;
  }

  .upload-progress-drawer {
    left: 1rem;
    right: 1rem;
    width: calc(100% - 2rem);
    bottom: 1rem;
  }

  /* Login card sizing */
  .login-card {
    padding: 2rem 1.25rem;
  }
}

@keyframes modalScaleIn {
  from { transform: scale(0.94); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}