/**
 * S3 File Uploader - Stylesheet
 *
 * Clean, professional styling with CSS variables for easy customization.
 * Mobile-first responsive design for mobile, tablet, and desktop.
 * Reference pattern: ~/ses-email-communicator/static/forward/styles.css
 */

/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
    /* Colors */
    --primary-color: #0066cc;
    --primary-hover: #0052a3;
    --primary-light: rgba(0, 102, 204, 0.1);
    --error-color: #dc3545;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --danger-hover: #c82333;

    /* Text Colors */
    --text-color: #333333;
    --text-muted: #666666;
    --text-light: #999999;

    /* Background Colors */
    --bg-color: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;

    /* Border Colors */
    --border-color: #dee2e6;
    --border-light: #e9ecef;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 1.75rem;
    --line-height: 1.6;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;

    /* Touch Target - Apple Human Interface Guidelines recommend 44px minimum */
    --touch-target-min: 44px;
}

/* ============================================
   Base Styles
   ============================================ */
* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    /* Prevent iOS text size adjustment on orientation change */
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--text-color);
    background-color: var(--bg-secondary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* Prevent pull-to-refresh on mobile when not desired */
    overscroll-behavior-y: contain;
}

/* ============================================
   Header
   ============================================ */
header {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    /* Ensure header doesn't collapse on mobile */
    min-height: 56px;
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-email {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

#logout-btn {
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-normal);
    /* Touch-friendly minimum size */
    min-height: var(--touch-target-min);
    min-width: 80px;
}

#logout-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   Main Content
   ============================================ */
main {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* ============================================
   Card Component
   ============================================ */
.card {
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.card-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

.card-header h2 {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
}

/* ============================================
   Login Section
   ============================================ */
#login-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
    padding: var(--spacing-lg);
}

.login-container {
    width: 100%;
    max-width: 400px;
}

.login-card {
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-header h1 {
    font-size: var(--font-size-xxl);
    margin: 0 0 var(--spacing-sm);
    color: var(--primary-color);
}

.login-header p {
    color: var(--text-muted);
    margin: 0;
}

.login-logo {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
}

/* ============================================
   Form Styles
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

input[type="email"],
input[type="password"],
input[type="text"],
textarea,
select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    background-color: var(--bg-color);
    /* Touch-friendly minimum height */
    min-height: var(--touch-target-min);
}

input[type="email"]:focus,
input[type="password"]:focus,
input[type="text"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

input[type="email"]::placeholder,
input[type="password"]::placeholder,
input[type="text"]::placeholder,
textarea::placeholder {
    color: var(--text-light);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* ============================================
   Button Styles
   ============================================ */
button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-normal);
    font-family: inherit;
    text-decoration: none;
    /* Touch-friendly minimum size */
    min-height: var(--touch-target-min);
    /* Prevent text selection on double-tap */
    -webkit-user-select: none;
    user-select: none;
    /* Prevent touch delay on mobile */
    touch-action: manipulation;
}

button:hover,
.btn:hover {
    background-color: var(--primary-hover);
}

button:focus,
.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.3);
}

button:disabled,
.btn:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.7;
}

/* Active state for touch feedback */
button:active,
.btn:active {
    transform: scale(0.98);
}

.btn-block {
    width: 100%;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-light);
}

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

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

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    /* Keep touch-friendly even for small buttons */
    min-height: 36px;
}

/* Icon button style */
.btn-icon {
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    padding: 0;
    background-color: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
}

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

.btn-icon.btn-delete:hover {
    background-color: #f8d7da;
    color: var(--danger-color);
}

/* ============================================
   Loading State
   ============================================ */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-light);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
    animation: spin 0.8s linear infinite;
}

.spinner-sm {
    width: 20px;
    height: 20px;
    border-width: 2px;
    margin: 0;
}

.spinner-inline {
    display: inline-block;
    vertical-align: middle;
    margin-right: var(--spacing-sm);
}

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

.loading p {
    color: var(--text-muted);
    margin: 0;
}

/* Button loading state */
.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading .btn-text {
    opacity: 0;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ============================================
   Error and Success Messages
   ============================================ */
.error-message {
    color: var(--error-color);
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.success-message {
    color: var(--success-color);
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.warning-message {
    color: #856404;
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

/* Hide elements by default */
.hidden {
    display: none !important;
}

/* ============================================
   Main App Section
   ============================================ */
#main-app {
    display: none;
}

#main-app.active {
    display: block;
}

.app-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .app-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ============================================
   Folder Selector Component
   ============================================ */
.folder-selector {
    margin-bottom: var(--spacing-lg);
}

.folder-select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.folder-select-wrapper select {
    flex: 1;
    padding-right: var(--spacing-xl);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    cursor: pointer;
}

.folder-select-wrapper select:disabled {
    background-color: var(--bg-tertiary);
    cursor: not-allowed;
    color: var(--text-muted);
}

.folder-loading {
    position: absolute;
    right: var(--spacing-xl);
    top: 50%;
    transform: translateY(-50%);
}

.folder-loading .spinner {
    margin: 0;
}

/* Muted text helper */
.text-muted {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* Upload zone placeholder (deprecated - replaced by drop-zone) */
.upload-zone-placeholder {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    text-align: center;
    background-color: var(--bg-tertiary);
    margin-top: var(--spacing-lg);
}

/* ============================================
   Drag and Drop Upload Zone
   ============================================ */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    text-align: center;
    background-color: var(--bg-tertiary);
    cursor: pointer;
    transition: border-color var(--transition-normal), background-color var(--transition-normal);
    min-height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Touch-friendly: make entire zone tappable */
    touch-action: manipulation;
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

/* Enable pointer events for the browse button inside drop zone */
.drop-zone-content .browse-btn {
    pointer-events: auto;
}

.drop-zone-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    transition: color var(--transition-normal);
}

.drop-zone-text {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-color);
    margin: 0 0 var(--spacing-xs);
}

.drop-zone-subtext {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 0 0 var(--spacing-md);
}

/* Drop zone hover state - when dragging over */
.drop-zone-hover {
    border-color: var(--primary-color);
    background-color: var(--primary-light);
}

.drop-zone-hover .drop-zone-icon {
    color: var(--primary-color);
}

.drop-zone-hover .drop-zone-text {
    color: var(--primary-color);
}

/* Drop zone active state - during drop */
.drop-zone-active {
    border-style: solid;
    border-color: var(--primary-color);
    background-color: var(--primary-light);
}

/* Drop zone focus state (keyboard navigation) */
.drop-zone:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.2);
}

/* ============================================
   Browse Files Button
   ============================================ */
.browse-btn {
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
    padding: var(--spacing-sm) var(--spacing-lg);
}

.browse-icon {
    flex-shrink: 0;
}

/* Show desktop text, hide mobile text by default */
.browse-btn-text {
    display: inline;
}

.browse-btn-text-mobile {
    display: none;
}

/* ============================================
   File Preview List
   ============================================ */
.file-list-preview {
    margin-top: var(--spacing-lg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    background-color: var(--bg-color);
    max-height: 300px;
    overflow-y: auto;
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    transition: background-color var(--transition-fast);
    /* Ensure touch-friendly height */
    min-height: var(--touch-target-min);
}

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

.file-item:hover {
    background-color: var(--bg-secondary);
}

.file-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-icon svg {
    width: 100%;
    height: 100%;
}

.file-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

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

.file-size {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.file-remove-btn {
    flex-shrink: 0;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    padding: 0;
    background-color: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
}

.file-remove-btn:hover {
    background-color: #f8d7da;
    color: var(--danger-color);
}

.file-remove-btn:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--primary-light);
}

/* ============================================
   Upload Actions
   ============================================ */
.upload-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-lg);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.file-summary {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-weight: 500;
}

.upload-buttons {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* ============================================
   Upload Progress Container
   ============================================ */
.upload-progress-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.upload-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.upload-progress-header h3 {
    margin: 0;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-color);
}

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

.btn-cancel:hover {
    background-color: #f8d7da;
    color: var(--danger-hover);
}

/* Overall batch progress */
.overall-progress {
    margin-bottom: var(--spacing-lg);
}

.overall-progress-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.overall-progress-track {
    height: 8px;
    background-color: var(--border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.overall-progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: var(--radius-sm);
    transition: width var(--transition-normal);
}

/* Upload items container */
.upload-items-container {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    background-color: var(--bg-color);
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

/* Individual upload item */
.upload-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

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

.upload-item-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.upload-item-icon svg {
    width: 20px;
    height: 20px;
}

.upload-item-icon .spin {
    animation: spin 1s linear infinite;
}

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

.upload-item-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: var(--spacing-xs);
}

.upload-item-details {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.upload-item-size {
    color: var(--text-muted);
}

.upload-item-status {
    color: var(--text-muted);
}

/* Upload item progress bar */
.upload-item-progress {
    height: 4px;
    background-color: var(--border-light);
    border-radius: 2px;
    overflow: hidden;
    margin: var(--spacing-sm) 0;
}

.upload-item-progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 2px;
    transition: width var(--transition-fast);
}

.upload-item-progress-text {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* Upload item states */
.upload-item-uploading .upload-item-icon {
    color: var(--primary-color);
}

.upload-item-processing .upload-item-icon {
    color: var(--primary-color);
}

.upload-item-complete .upload-item-icon {
    color: var(--success-color);
}

.upload-item-complete .upload-item-status {
    color: var(--success-color);
}

.upload-item-failed .upload-item-icon {
    color: var(--danger-color);
}

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

.upload-item-cancelled .upload-item-icon {
    color: var(--text-light);
}

.upload-item-cancelled .upload-item-status {
    color: var(--text-light);
}

/* Upload item error message */
.upload-item-error {
    font-size: var(--font-size-sm);
    color: var(--danger-color);
    margin-top: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

/* Retry button */
.btn-retry {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-retry:hover {
    background-color: var(--border-light);
}

/* Retry all container */
.retry-all-container {
    margin-top: var(--spacing-lg);
    text-align: center;
}

/* Upload notification */
.upload-notification {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.upload-notification.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

/* ============================================
   File Listing Component
   ============================================ */

/* Loading state for file list */
.file-list-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.file-list-loading p {
    margin: var(--spacing-md) 0 0;
}

/* Empty state for file list */
.file-list-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    text-align: center;
}

.file-list-empty svg {
    color: var(--border-color);
    margin-bottom: var(--spacing-md);
}

.file-list-empty p {
    margin: 0 0 var(--spacing-md);
}

/* Error state for file list */
.file-list-error {
    padding: var(--spacing-lg);
    text-align: center;
}

.file-list-error .error-message {
    margin-bottom: var(--spacing-md);
}

/* File search */
.file-search {
    margin-bottom: var(--spacing-md);
}

.file-search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.file-search-icon {
    position: absolute;
    left: var(--spacing-md);
    color: var(--text-muted);
    pointer-events: none;
}

.file-search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: calc(var(--spacing-md) + 24px);
    padding-right: calc(var(--spacing-md) + 24px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-family: inherit;
    min-height: var(--touch-target-min);
}

.file-search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.file-search-clear {
    position: absolute;
    right: var(--spacing-sm);
    width: 36px;
    height: 36px;
    padding: var(--spacing-xs);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    min-height: 36px;
    min-width: 36px;
}

.file-search-clear:hover {
    color: var(--text-color);
    background-color: var(--bg-tertiary);
}

/* File list table - Desktop view */
.file-list-table-wrapper {
    overflow-x: auto;
    display: block;
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

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

.file-list-table th,
.file-list-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.file-list-table th {
    font-weight: 600;
    color: var(--text-muted);
    background-color: var(--bg-secondary);
    position: sticky;
    top: 0;
}

.file-list-table tbody tr:hover {
    background-color: var(--bg-secondary);
}

.file-list-table tbody tr:last-child td {
    border-bottom: none;
}

/* Table column widths */
.file-col-checkbox {
    width: 40px;
    text-align: center;
}

.file-col-icon {
    width: 40px;
    text-align: center;
}

.file-col-name {
    min-width: 150px;
}

.file-col-size {
    width: 80px;
    white-space: nowrap;
}

.file-col-date {
    width: 120px;
    white-space: nowrap;
}

.file-col-uploader {
    width: 150px;
}

.file-col-actions {
    width: 60px;
    text-align: center;
}

/* File type icon in table */
.file-type-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.file-type-icon svg {
    width: 20px;
    height: 20px;
}

/* File name text - clickable for preview */
.file-name-text {
    display: block;
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Clickable file name for preview */
.file-name-link {
    color: var(--primary-color);
    text-decoration: none;
    cursor: pointer;
    display: block;
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    /* Touch-friendly tap area */
    padding: var(--spacing-xs) 0;
}

.file-name-link:hover {
    text-decoration: underline;
    color: var(--primary-hover);
}

/* File list cards - Mobile view */
.file-list-cards {
    display: none;
}

.file-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    position: relative;
    /* Touch-friendly minimum height */
    min-height: 60px;
}

.file-card:last-child {
    border-bottom: none;
}

.file-card:hover {
    background-color: var(--bg-secondary);
}

/* Touch active state for file cards */
.file-card:active {
    background-color: var(--primary-light);
}

.file-card-icon {
    flex-shrink: 0;
    color: var(--text-muted);
}

.file-card-icon svg {
    width: 24px;
    height: 24px;
}

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

.file-card-name {
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: var(--spacing-xs);
    word-break: break-word;
}

/* Clickable file name in card for preview */
.file-card-name-link {
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    word-break: break-word;
    cursor: pointer;
    text-decoration: none;
    display: block;
    /* Touch-friendly tap area */
    padding: var(--spacing-xs) 0;
}

.file-card-name-link:hover {
    text-decoration: underline;
    color: var(--primary-hover);
}

.file-card-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.file-card-uploader {
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

.file-card-delete {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
}

/* File card checkbox */
.file-card-checkbox {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Touch-friendly tap area for checkbox */
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
}

/* Load more button */
.file-list-load-more {
    padding: var(--spacing-md);
    text-align: center;
    border-top: 1px solid var(--border-light);
}

/* File count */
.file-list-count {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid var(--border-light);
}

/* Responsive: Show cards on mobile, table on desktop */
@media (max-width: 768px) {
    .file-list-table-wrapper {
        display: none;
    }

    .file-list-cards {
        display: block;
    }
}

/* ============================================
   Bulk Delete - Selection and Action Bar
   ============================================ */

/* Selection checkboxes - Touch-friendly */
.file-select-checkbox,
.file-select-all-checkbox {
    width: 22px;
    height: 22px;
    cursor: pointer;
    margin: 0;
    accent-color: var(--primary-color);
    /* Ensure touch-friendly tap area */
    min-width: 22px;
    min-height: 22px;
}

.file-select-checkbox:focus,
.file-select-all-checkbox:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Selected row highlight */
.file-row.selected {
    background-color: var(--primary-light);
}

.file-row.selected:hover {
    background-color: rgba(0, 102, 204, 0.15);
}

.file-card.selected {
    background-color: var(--primary-light);
}

.file-card.selected:hover {
    background-color: rgba(0, 102, 204, 0.15);
}

/* Bulk action bar */
.bulk-action-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--primary-light);
    border: 1px solid var(--primary-color);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
}

.bulk-action-bar.hidden {
    display: none;
}

.bulk-action-count {
    font-weight: 600;
    color: var(--primary-color);
    font-size: var(--font-size-sm);
}

.bulk-action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.bulk-delete-btn {
    background-color: var(--danger-color);
    color: white;
}

.bulk-delete-btn:hover {
    background-color: var(--danger-hover);
}

.bulk-clear-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.bulk-clear-btn:hover {
    background-color: var(--primary-light);
}

/* ============================================
   Bulk Delete Confirmation Modal
   ============================================ */
.bulk-delete-modal {
    max-width: 500px;
}

.bulk-delete-warning {
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: #856404;
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.bulk-delete-file-list {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--spacing-lg);
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    background-color: var(--bg-secondary);
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

.bulk-delete-file-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    font-size: var(--font-size-sm);
    color: var(--text-color);
}

.bulk-delete-file-item:last-child {
    border-bottom: none;
}

.bulk-delete-confirm-section {
    margin-bottom: var(--spacing-lg);
}

.bulk-delete-confirm-section label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.bulk-delete-confirm-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--danger-color);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    text-align: center;
    letter-spacing: 0.1em;
    font-weight: 600;
    min-height: var(--touch-target-min);
}

.bulk-delete-confirm-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.2);
}

.bulk-delete-confirm-input::placeholder {
    font-weight: 400;
    letter-spacing: normal;
    color: var(--text-light);
}

/* Bulk delete progress */
.bulk-delete-progress {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.bulk-delete-progress.hidden {
    display: none;
}

.bulk-delete-progress-text {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.bulk-delete-progress-bar-container {
    height: 8px;
    background-color: var(--border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.bulk-delete-progress-bar {
    height: 100%;
    background-color: var(--danger-color);
    border-radius: var(--radius-sm);
    transition: width var(--transition-fast);
}

/* ============================================
   Modal Component
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    /* Prevent scroll on body when modal is open */
    overscroll-behavior: contain;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
    max-height: 90vh;
    overflow: auto;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

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

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-close {
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    padding: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
}

.modal-close:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body p {
    margin: 0 0 var(--spacing-md);
}

.modal-body p:last-child {
    margin-bottom: 0;
}

.delete-filename {
    font-weight: 600;
    word-break: break-word;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-light);
}

/* ============================================
   File Preview Modal
   ============================================ */
.preview-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.preview-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.preview-modal-content {
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    max-width: 90vw;
    max-height: 90vh;
    width: auto;
    display: flex;
    flex-direction: column;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
    overflow: hidden;
}

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

.preview-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    background-color: var(--bg-color);
    flex-shrink: 0;
}

.preview-modal-filename {
    margin: 0;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: calc(100% - 48px);
}

.preview-modal-close {
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    padding: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    flex-shrink: 0;
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
}

.preview-modal-close:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
}

.preview-modal-body {
    flex: 1;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    min-height: 200px;
    background-color: var(--bg-secondary);
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

/* Preview loading state */
.preview-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.preview-loading .spinner {
    margin-bottom: var(--spacing-md);
}

.preview-loading p {
    margin: 0;
}

/* Preview content container */
.preview-content {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Image preview */
.preview-image {
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
}

/* Video preview */
.preview-video {
    max-width: 100%;
    max-height: 70vh;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    background-color: #000;
}

/* Audio preview */
.preview-audio-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    min-width: 300px;
}

.preview-audio-icon {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.preview-audio-filename {
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: var(--spacing-lg);
    word-break: break-word;
}

.preview-audio {
    width: 100%;
    max-width: 400px;
    min-height: var(--touch-target-min);
}

/* PDF preview */
.preview-pdf-container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    min-height: 60vh;
}

.preview-pdf-iframe {
    flex: 1;
    width: 100%;
    min-height: 60vh;
    border: none;
    border-radius: var(--radius-sm);
    background-color: var(--bg-color);
}

.preview-pdf-fallback {
    padding: var(--spacing-md);
    text-align: center;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-light);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.preview-pdf-fallback p {
    margin: 0 0 var(--spacing-sm);
}

/* Unsupported file preview */
.preview-unsupported {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-muted);
}

.preview-unsupported svg {
    margin-bottom: var(--spacing-lg);
    color: var(--border-color);
}

.preview-unsupported-message {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: var(--spacing-lg);
}

.preview-download-link {
    margin-top: var(--spacing-md);
}

/* Preview error state */
.preview-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-muted);
}

.preview-error svg {
    margin-bottom: var(--spacing-lg);
    color: var(--danger-color);
}

.preview-error-message {
    font-size: var(--font-size-base);
    color: var(--danger-color);
    margin-bottom: var(--spacing-lg);
}

.preview-retry-btn {
    margin-top: var(--spacing-md);
}

/* ============================================
   Upload History Section
   ============================================ */
.upload-history-card {
    margin-top: var(--spacing-lg);
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.history-header-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.history-header-title h2 {
    margin: 0;
}

.history-toggle {
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    padding: 0;
    transition: transform var(--transition-fast);
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
}

/* Collapsed state */
#upload-history-section.collapsed .history-content {
    display: none;
}

#upload-history-section.collapsed .history-toggle {
    transform: rotate(180deg);
}

/* History filter dropdown */
.history-filter {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.history-filter-select {
    min-width: 150px;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: var(--spacing-xl);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    background-color: var(--bg-color);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-sm) center;
    cursor: pointer;
    min-height: var(--touch-target-min);
}

.history-filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* History content area */
.history-content {
    margin-top: var(--spacing-md);
}

.history-list-container {
    max-height: 400px;
    overflow-y: auto;
    /* Smooth scrolling on iOS */
    -webkit-overflow-scrolling: touch;
}

/* History loading state */
.history-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    color: var(--text-muted);
}

/* History empty state */
.history-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    text-align: center;
}

.history-empty svg {
    margin-bottom: var(--spacing-md);
    color: var(--border-color);
}

.history-empty p {
    margin: 0;
}

/* History error state */
.history-error {
    padding: var(--spacing-lg);
    text-align: center;
}

.history-error .error-message {
    margin-bottom: var(--spacing-md);
}

/* History list */
.history-list {
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    background-color: var(--bg-color);
}

/* Individual history item */
.history-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    transition: background-color var(--transition-fast);
    /* Touch-friendly minimum height */
    min-height: 56px;
}

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

.history-item:hover {
    background-color: var(--bg-secondary);
}

.history-item-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.history-item-icon svg {
    width: 20px;
    height: 20px;
}

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

.history-item-filename {
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.history-item-filename span {
    color: var(--text-color);
}

.history-item-link {
    color: var(--primary-color);
    text-decoration: none;
    cursor: pointer;
    /* Touch-friendly tap area */
    display: inline-block;
    padding: var(--spacing-xs) 0;
}

.history-item-link:hover {
    text-decoration: underline;
    color: var(--primary-hover);
}

.history-item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.history-item-meta > span {
    display: inline-flex;
    align-items: center;
}

.history-item-meta > span:not(:last-child)::after {
    content: '';
    width: 3px;
    height: 3px;
    background-color: var(--text-light);
    border-radius: 50%;
    margin-left: var(--spacing-sm);
}

.history-item-folder {
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item-status {
    flex-shrink: 0;
    display: flex;
    align-items: flex-start;
}

/* Status badges */
.history-status-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    text-transform: capitalize;
}

.history-status-completed {
    color: var(--success-color);
    background-color: #d4edda;
}

.history-status-failed {
    color: var(--danger-color);
    background-color: #f8d7da;
}

.history-status-deleted {
    color: var(--text-muted);
    background-color: var(--bg-tertiary);
}

.history-status-unknown {
    color: var(--text-muted);
    background-color: var(--bg-tertiary);
}

/* History count */
.history-count {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid var(--border-light);
}

/* ============================================
   Footer
   ============================================ */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

footer p {
    margin: 0;
}

/* ============================================
   Responsive Design - Tablet (480px - 768px)
   ============================================ */
@media (max-width: 768px) {
    /* Preview modal responsive */
    .preview-modal-content {
        max-width: 95vw;
        max-height: 95vh;
    }

    .preview-modal-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .preview-modal-filename {
        font-size: var(--font-size-sm);
    }

    .preview-modal-body {
        padding: var(--spacing-md);
    }

    .preview-image {
        max-height: 60vh;
    }

    .preview-video {
        max-height: 50vh;
    }

    .preview-pdf-container {
        min-height: 50vh;
    }

    .preview-pdf-iframe {
        min-height: 50vh;
    }

    .preview-audio-container {
        min-width: 250px;
        padding: var(--spacing-lg);
    }

    /* History responsive styles */
    .history-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .history-filter {
        width: 100%;
    }

    .history-filter-select {
        width: 100%;
    }
}

/* ============================================
   Responsive Design - Mobile (320px - 480px)
   ============================================ */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    main {
        padding: var(--spacing-md);
    }

    .card {
        padding: var(--spacing-lg);
        /* Full width cards on mobile */
        margin-left: calc(-1 * var(--spacing-md));
        margin-right: calc(-1 * var(--spacing-md));
        border-radius: 0;
    }

    header {
        padding: var(--spacing-sm) var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .logo {
        font-size: 1.25rem;
    }

    .user-info {
        width: 100%;
        justify-content: space-between;
    }

    .login-card {
        padding: var(--spacing-lg);
    }

    .login-header h1 {
        font-size: var(--font-size-xl);
    }

    /* Folder selector responsive */
    .folder-selector label {
        font-size: var(--font-size-sm);
    }

    /* Drop zone responsive */
    .drop-zone {
        min-height: 150px;
        padding: var(--spacing-lg);
    }

    .drop-zone-icon {
        width: 40px;
        height: 40px;
    }

    /* Swap button text on mobile */
    .browse-btn-text {
        display: none;
    }

    .browse-btn-text-mobile {
        display: inline;
    }

    /* Ensure touch-friendly size */
    .browse-btn {
        min-height: 48px;
        padding: var(--spacing-md) var(--spacing-lg);
        width: 100%;
        max-width: 250px;
    }

    /* Upload actions responsive */
    .upload-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .file-summary {
        text-align: center;
        margin-bottom: var(--spacing-sm);
    }

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

    .upload-buttons .btn {
        flex: 1;
    }

    /* Upload progress responsive */
    .upload-progress-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }

    .upload-progress-header .btn-cancel {
        width: 100%;
    }

    .upload-item {
        flex-direction: column;
        align-items: stretch;
    }

    .upload-item-icon {
        position: absolute;
        right: var(--spacing-md);
        top: var(--spacing-md);
    }

    .upload-item {
        position: relative;
        padding-right: calc(var(--spacing-md) + 32px);
    }

    /* Modal responsive */
    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }

    .modal-footer {
        flex-direction: column;
    }

    .modal-footer .btn {
        width: 100%;
    }

    /* Preview modal responsive */
    .preview-modal-content {
        max-width: 100vw;
        max-height: 100vh;
        border-radius: 0;
    }

    .preview-image {
        max-height: 50vh;
    }

    .preview-video {
        max-height: 40vh;
    }

    .preview-audio-container {
        min-width: 200px;
    }

    /* Bulk action bar responsive */
    .bulk-action-bar {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .bulk-action-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .bulk-action-buttons .btn {
        flex: 1;
        min-width: 120px;
    }

    /* History item responsive */
    .history-item {
        flex-direction: column;
        align-items: stretch;
    }

    .history-item-icon {
        display: none;
    }

    .history-item-status {
        margin-top: var(--spacing-sm);
    }

    .history-item-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .history-item-meta > span:not(:last-child)::after {
        display: none;
    }

    .history-item-folder {
        max-width: none;
    }
}

/* ============================================
   Ultra-small screens (320px and below)
   ============================================ */
@media (max-width: 320px) {
    html {
        font-size: 13px;
    }

    .card {
        padding: var(--spacing-md);
    }

    .login-card {
        padding: var(--spacing-md);
    }

    .drop-zone {
        min-height: 120px;
        padding: var(--spacing-md);
    }

    .drop-zone-icon {
        width: 32px;
        height: 32px;
    }

    .drop-zone-text {
        font-size: var(--font-size-sm);
    }

    .drop-zone-subtext {
        display: none;
    }

    /* Simplify browse button on tiny screens */
    .browse-btn {
        max-width: 200px;
    }

    /* Stack upload buttons */
    .upload-buttons {
        flex-direction: column;
        width: 100%;
    }

    .upload-buttons .btn {
        width: 100%;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    body {
        background-color: white;
    }

    header {
        background-color: white;
        color: var(--text-color);
        box-shadow: none;
        border-bottom: 2px solid var(--primary-color);
    }

    .card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }

    footer {
        display: none;
    }

    #logout-btn {
        display: none;
    }

    .drop-zone {
        display: none;
    }

    .upload-progress-container {
        display: none;
    }

    .modal-overlay {
        display: none;
    }

    .preview-modal-overlay {
        display: none;
    }

    .file-search {
        display: none;
    }

    .btn-delete {
        display: none;
    }

    .bulk-action-bar {
        display: none;
    }

    .file-col-checkbox {
        display: none;
    }

    .file-select-checkbox {
        display: none;
    }

    .upload-history-card {
        display: none;
    }
}

/* ============================================
   Accessibility
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-muted: #333333;
    }

    input[type="email"],
    input[type="password"],
    input[type="text"],
    textarea,
    select {
        border-width: 2px;
    }

    .drop-zone {
        border-width: 3px;
    }

    .upload-item-progress,
    .overall-progress-track {
        border: 1px solid var(--border-color);
    }

    .modal-overlay {
        background-color: rgba(0, 0, 0, 0.7);
    }

    .preview-modal-overlay {
        background-color: rgba(0, 0, 0, 0.9);
    }

    .file-select-checkbox,
    .file-select-all-checkbox {
        border: 2px solid var(--border-color);
    }
}

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   Touch-specific optimizations
   ============================================ */
@media (hover: none) and (pointer: coarse) {
    /* Touch devices - disable hover states that may interfere */
    .file-item:hover,
    .file-card:hover,
    .history-item:hover {
        background-color: transparent;
    }

    /* Ensure all interactive elements are touch-friendly */
    button,
    .btn,
    input,
    select,
    textarea,
    a {
        min-height: var(--touch-target-min);
    }

    /* Increase tap targets for small buttons */
    .btn-sm {
        min-height: 40px;
    }

    /* Make file cards easier to tap */
    .file-card {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    /* Ensure checkboxes have adequate touch area */
    .file-select-checkbox,
    .file-select-all-checkbox {
        width: 24px;
        height: 24px;
    }
}