@import url('https://fonts.googleapis.com/css2?family=Segoe+UI:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

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

:root {
    /* Dark Theme Colors - OneDrive Style */
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d30;
    --bg-card: #252526;
    --bg-elevated: #3c3c3c;
    --bg-input: #3c3c3c;
    --bg-sidebar: #1a1a1a;
    --bg-hover: #404040;

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #969696;
    --text-disabled: #6a6a6a;

    /* Accent Colors */
    --accent: #0078d4;
    --accent-hover: #106ebe;
    --accent-light: rgba(0, 120, 212, 0.1);
    --accent-border: rgba(0, 120, 212, 0.3);

    /* Status Colors */
    --success: #107c10;
    --success-light: rgba(16, 124, 16, 0.1);
    --warning: #ff8c00;
    --warning-light: rgba(255, 140, 0, 0.1);
    --error: #d13438;
    --error-light: rgba(209, 52, 56, 0.1);

    /* Border & Shadows */
    --border: #3c3c3c;
    --border-light: #464647;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.25);

    /* Spacing & Sizing */
    --radius: 6px;
    --radius-lg: 12px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Inter', system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Layout Container */
.app-container {
    display: flex;
    height: 100vh;
    flex-direction: column;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 var(--spacing-lg);
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
}

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

.header-logo {
    height: 36px;
    width: auto;
    filter: brightness(1.2);
    transition: var(--transition);
}

.header-logo:hover {
    filter: brightness(1.4);
    transform: scale(1.05);
}

.app-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-left: var(--spacing);
}

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

/* Search Bar */
.search-container {
    position: relative;
    width: 280px;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 40px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
    background: var(--bg-elevated);
}

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

.search-icon {
    position: absolute;
    left: var(--spacing);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 16px;
    pointer-events: none;
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.user-menu:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

/* Main Content Layout */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: var(--transition);
}

.sidebar-header {
    padding: var(--spacing);
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 13px;
    color: var(--text-muted);
    overflow: hidden;
    flex-wrap: wrap;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    padding: 4px var(--spacing-sm);
    border-radius: var(--radius);
    transition: var(--transition);
    white-space: nowrap;
    color: var(--text-muted);
}

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

.breadcrumb-item:last-child {
    color: var(--text-primary);
    font-weight: 500;
}

.breadcrumb-separator {
    color: var(--text-disabled);
    font-size: 12px;
    margin: 0 2px;
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing);
}

.nav-section {
    margin-bottom: var(--spacing-lg);
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-disabled);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing);
    padding: var(--spacing-sm) var(--spacing);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 2px;
    color: var(--text-secondary);
    font-size: 14px;
}

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

.nav-item.active {
    background: var(--accent-light);
    color: var(--accent);
}

.nav-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

/* Content Area */
.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Toolbar */
.toolbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing);
    min-height: 56px;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
    min-height: 32px;
}

.btn:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.3);
}

.btn-success {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #0e6b0e;
    border-color: #0e6b0e;
}

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

.btn-danger:hover:not(:disabled) {
    background: #b52d32;
    border-color: #b52d32;
}

.btn-icon {
    padding: var(--spacing-sm);
    min-width: 32px;
    justify-content: center;
}

/* View Toggle */
.view-toggle {
    display: flex;
    background: var(--bg-input);
    border-radius: var(--radius);
    padding: 2px;
    border: 1px solid var(--border);
}

.view-toggle-btn {
    padding: 6px var(--spacing);
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
    font-size: 12px;
    font-weight: 500;
}

.view-toggle-btn.active {
    background: var(--accent);
    color: white;
    box-shadow: var(--shadow-sm);
}

.view-toggle-btn:not(.active):hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

/* Files Container */
.files-container {
    flex: 1;
    overflow: auto;
    padding: var(--spacing-lg);
    background: var(--bg-primary);
}

/* Files Grid View */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing);
    padding: var(--spacing) 0;
}

/* Files List View */
.files-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--spacing) 0;
}

/* File Item Base */
.file-item {
    background: var(--bg-card);
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    user-select: none;
    color: var(--text-secondary);
}

.file-item:hover {
    background: var(--bg-elevated);
    border-color: var(--border-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    color: var(--text-primary);
}

.file-item.selected {
    background: var(--accent-light);
    border-color: var(--accent-border);
    color: var(--accent);
}

.file-item.being-renamed {
    background: var(--bg-elevated);
    border-color: var(--accent);
}

/* Grid View Styles */
.file-item.grid-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing);
    aspect-ratio: 1;
    min-height: 120px;
    justify-content: center;
}

/* File Icon & Thumbnails */
.file-icon {
    font-size: 36px;
    margin-bottom: var(--spacing-sm);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    transition: var(--transition);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-item:hover .file-icon {
    transform: scale(1.05);
}

.file-name {
    font-size: 12px;
    font-weight: 500;
    line-height: 1.3;
    word-break: break-word;
    max-width: 100%;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* List View Styles */
.file-item.list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing);
    padding: var(--spacing-sm) var(--spacing);
    border-radius: var(--radius);
    min-height: 44px;
}

.file-item.list-item .file-icon {
    font-size: 20px;
    margin: 0;
    width: 24px;
    text-align: center;
}

.file-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    min-width: 0;
}

.file-details {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.file-item.list-item .file-name {
    font-size: 14px;
    -webkit-line-clamp: 1;
    margin-bottom: 2px;
}

.file-meta {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 12px;
    color: var(--text-muted);
    min-width: 200px;
}

.file-size,
.file-date {
    white-space: nowrap;
}
/* File Thumbnails */
.file-thumbnail {
    width: 100%;
    /*height: 100px;*/
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.thumbnail-placeholder {
    font-size: 32px;
    color: var(--text-muted);
    transition: var(--transition);
}

.file-thumbnail img,
.file-thumbnail video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.file-thumbnail:hover img,
.file-thumbnail:hover video {
    transform: scale(1.1);
}

.file-thumbnail.loading {
    position: relative;
}

.file-thumbnail.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 1;
}

.file-thumbnail.error .thumbnail-placeholder {
    color: var(--error);
    font-size: 24px;
}

/* List View Thumbnails */
.file-item.list-item .file-thumbnail {
    width: 40px;
    height: 40px;
    margin: 0;
    flex-shrink: 0;
}

.file-item.list-item .thumbnail-placeholder {
    font-size: 20px;
}

.file-item.list-item .file-icon {
    font-size: 20px;
    margin: 0;
    width: 24px;
    text-align: center;
    height: 20px;
}

/* Video Thumbnails with Play Icon */
.file-thumbnail[data-type="video"] {
    position: relative;
}

.file-thumbnail[data-type="video"]:not(.loading)::before {
    content: '▶️';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    z-index: 2;
    opacity: 0;
    transition: var(--transition);
}

.file-thumbnail[data-type="video"]:hover::before {
    opacity: 1;
}

/* Fade in animation for loaded thumbnails */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.file-thumbnail img.loaded,
.file-thumbnail video.loaded {
    animation: fadeIn 0.3s ease-out;
}
/* Selection Checkbox */
.selection-checkbox {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    opacity: 0;
    transition: var(--transition);
    cursor: pointer;
}

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

.file-item.list-item .selection-checkbox {
    position: static;
    opacity: 1;
    margin-right: var(--spacing-sm);
}

/* Rename Input */
.rename-input {
    background: var(--bg-elevated);
    border: 2px solid var(--accent);
    border-radius: var(--radius);
    padding: 4px var(--spacing-sm);
    font-size: inherit;
    font-family: inherit;
    color: var(--text-primary);
    width: 100%;
    outline: none;
    box-shadow: 0 0 0 2px var(--accent-light);
}

/* Context Menu */
.context-menu {
    position: absolute;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
    min-width: 200px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.95);
    transition: var(--transition);
}

.context-menu.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing);
    padding: var(--spacing-sm) var(--spacing);
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
    color: var(--text-secondary);
}

.context-menu-item:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.context-menu-item.danger:hover {
    background: var(--error-light);
    color: var(--error);
}

.context-menu-separator {
    height: 1px;
    background: var(--border);
    margin: var(--spacing-sm) 0;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

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

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 520px;
    max-height: 80vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: var(--transition);
}

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

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

.modal-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius);
    transition: var(--transition);
    font-size: 16px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal-body {
    padding: var(--spacing-lg);
    max-height: 60vh;
    overflow-y: auto;
}

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

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

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-input {
    width: 100%;
    padding: var(--spacing) var(--spacing);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
    font-family: inherit;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
    background: var(--bg-elevated);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    background: var(--bg-tertiary);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.upload-zone:hover {
    border-color: var(--accent-border);
    background: var(--accent-light);
}

.upload-zone.dragover {
    border-color: var(--accent);
    background: var(--accent-light);
    transform: scale(1.02);
}

.upload-zone-content {
    pointer-events: none;
}

.upload-zone-icon {
    font-size: 48px;
    color: var(--text-muted);
    margin-bottom: var(--spacing);
    transition: var(--transition);
}

.upload-zone:hover .upload-zone-icon {
    color: var(--accent);
    transform: scale(1.1);
}

.upload-zone-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 16px;
    font-weight: 500;
}

.upload-zone-subtext {
    font-size: 12px;
    color: var(--text-muted);
}

.file-input-hidden {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

/* Selected Files List */
.selected-files {
    margin-top: var(--spacing);
    padding-top: var(--spacing);
    border-top: 1px solid var(--border);
}

.selected-files h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.selected-file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 6px 0;
    font-size: 12px;
    color: var(--text-muted);
}

.selected-file-item .file-icon {
    font-size: 16px;
    margin: 0;
}

.selected-file-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Progress Bar */
.progress-container {
    margin-top: var(--spacing);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--success));
    border-radius: 3px;
    transition: width var(--transition);
    width: 0%;
}

.progress-text {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    min-height: 300px;
}

.empty-state-icon {
    font-size: 64px;
    color: var(--text-disabled);
    margin-bottom: var(--spacing);
    opacity: 0.6;
}

.empty-state-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state-text {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    max-width: 400px;
    line-height: 1.6;
}

/* Notifications */
.notification {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing);
    min-width: 320px;
    max-width: 400px;
    z-index: 3000;
    transform: translateX(100%);
    transition: var(--transition);
}

.notification.visible {
    transform: translateX(0);
}

.notification.success {
    border-left: 4px solid var(--success);
}

.notification.error {
    border-left: 4px solid var(--error);
}

.notification.warning {
    border-left: 4px solid var(--warning);
}

.notification.info {
    border-left: 4px solid var(--accent);
}

.notification-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 13px;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding: var(--spacing);
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 420px;
    text-align: center;
}

.login-logo {
    height: 48px;
    margin-bottom: var(--spacing-lg);
    filter: brightness(1.2);
}

.login-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.login-subtitle {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
    font-size: 15px;
}

.login-form {
    text-align: left;
}

.login-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
    text-align: center;
}

.login-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing);
    margin-bottom: var(--spacing);
}

.login-feature {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    color: var(--text-muted);
}

.login-copyright {
    font-size: 11px;
    color: var(--text-disabled);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        top: 56px;
        height: calc(100vh - 56px);
        z-index: 200;
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        left: 0;
    }

    .main-content {
        margin-left: 0;
    }

    .search-container {
        width: 200px;
    }

    .files-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: var(--spacing-sm);
    }

    .toolbar {
        padding: var(--spacing-sm);
        flex-wrap: wrap;
        min-height: auto;
    }

    .toolbar-left {
        order: 2;
        width: 100%;
        margin-top: var(--spacing-sm);
    }

    .file-meta {
        display: none;
    }

    .modal {
        width: 95%;
        margin: var(--spacing);
    }

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

    .header {
        padding: 0 var(--spacing);
    }

    .app-title {
        display: none;
    }
}

@media (max-width: 480px) {
    .files-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }

    .file-icon {
        font-size: 36px;
    }

    .file-name {
        font-size: 11px;
    }

    .search-container {
        width: 150px;
    }

    .toolbar-left .btn {
        font-size: 12px;
        padding: 6px var(--spacing-sm);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.file-item {
    animation: fadeIn 0.3s ease-out;
}

.modal.visible {
    animation: bounceIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

::-webkit-scrollbar-corner {
    background: var(--bg-secondary);
}

/* Selection Styles */
::selection {
    background: var(--accent-light);
    color: var(--accent);
}

/* Focus Styles */
.btn:focus-visible,
.form-input:focus-visible,
.search-input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* High Contrast Support */
@media (prefers-contrast: high) {
    :root {
        --border: #555555;
        --border-light: #666666;
        --text-muted: #aaaaaa;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .sidebar,
    .toolbar,
    .modal-overlay {
        display: none !important;
    }

    .content-area {
        padding: 0;
    }

    .file-item {
        break-inside: avoid;
    }
}