:root {
    /* Material Design 3 - Light */
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #FFD8E4;
    --md-sys-color-on-tertiary-container: #31111D;
    --md-sys-color-error: #B3261E;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #F9DEDC;
    --md-sys-color-on-error-container: #410E0B;
    --md-sys-color-surface: #FFFBFE;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;
    --md-sys-color-inverse-surface: #322F35;
    --md-sys-color-inverse-on-surface: #F5EFF7;

    --md-sys-elevation-1: 0 1px 2px 0 rgba(0, 0, 0, 0.03), 0 1px 3px 1px rgba(0, 0, 0, 0.07);
    --md-sys-elevation-2: 0 1px 2px 0 rgba(0, 0, 0, 0.03), 0 2px 6px 2px rgba(0, 0, 0, 0.07);
    --md-sys-elevation-3: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 4px 8px 3px rgba(0, 0, 0, 0.08);

    --radius-xs: 8px;
    --radius-sm: 12px;
    --radius-md: 14px;
    --radius-lg: 16px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    --sidebar-width: 280px;
    --bottom-nav-height: 80px;
}

[data-theme="dark"] {
    /* Material Design 3 - Dark */
    --md-sys-color-primary: #D0BCFF;
    --md-sys-color-on-primary: #381E72;
    --md-sys-color-primary-container: #4F378B;
    --md-sys-color-on-primary-container: #EADDFF;
    --md-sys-color-secondary: #CCC2DC;
    --md-sys-color-on-secondary: #332D41;
    --md-sys-color-secondary-container: #4A4458;
    --md-sys-color-on-secondary-container: #E8DEF8;
    --md-sys-color-tertiary: #EFB8C8;
    --md-sys-color-on-tertiary: #492532;
    --md-sys-color-tertiary-container: #633B48;
    --md-sys-color-on-tertiary-container: #FFD8E4;
    --md-sys-color-error: #F2B8B5;
    --md-sys-color-on-error: #601410;
    --md-sys-color-error-container: #8C1D18;
    --md-sys-color-on-error-container: #F9DEDC;
    --md-sys-color-surface: #1C1B1F;
    --md-sys-color-on-surface: #E6E1E5;
    --md-sys-color-surface-variant: #49454F;
    --md-sys-color-on-surface-variant: #CAC4D0;
    --md-sys-color-outline: #938F99;
    --md-sys-color-outline-variant: #49454F;
    --md-sys-color-inverse-surface: #F5EFF7;
    --md-sys-color-inverse-on-surface: #322F35;

    --md-sys-elevation-1: 0 1px 2px 0 rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-2: 0 1px 2px 0 rgba(0, 0, 0, 0.3), 0 2px 6px 2px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-3: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 4px 8px 3px rgba(0, 0, 0, 0.15);
}

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

html {
    font-size: 16px;
}

body {
    font-family: 'Outfit', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--md-sys-color-surface);
    min-height: 100vh;
    color: var(--md-sys-color-on-surface);
    -webkit-font-smoothing: antialiased;
}

#app {
    min-height: 100vh;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    background: var(--md-sys-color-surface);
    z-index: 9999;
    transition: opacity 0.3s ease;
}

.loading-logo {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-xl);
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary-container);
    animation: pulse 2s ease-in-out infinite;
    overflow: hidden;
    padding: 16px;
}

.loading-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.loading-logo i {
    width: 40px;
    height: 40px;
}

.loading-bar {
    width: 160px;
    height: 4px;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.loading-progress {
    height: 100%;
    width: 30%;
    background: var(--md-sys-color-primary);
    border-radius: var(--radius-full);
    animation: progress 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes progress {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

/* Auth Pages */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--md-sys-color-surface);
}

.auth-card {
    position: relative;
    width: 100%;
    max-width: 420px;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--md-sys-elevation-2);
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-header {
    text-align: center;
    margin-bottom: 28px;
}

.auth-logo {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary-container);
    margin: 0 auto 16px;
    overflow: hidden;
    padding: 12px;
}

.auth-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.auth-logo i {
    width: 32px;
    height: 32px;
}

.auth-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--md-sys-color-on-surface);
}

.auth-header p {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.875rem;
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--md-sys-color-on-surface-variant);
    letter-spacing: 0.025em;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--radius-xs);
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    font-size: 0.9375rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

.form-input:hover {
    border-color: var(--md-sys-color-on-surface-variant);
}

.form-input:focus {
    border-color: var(--md-sys-color-primary);
    box-shadow: 0 0 0 1px var(--md-sys-color-primary);
}

.form-input::placeholder {
    color: var(--md-sys-color-outline);
}

.form-input:disabled {
    opacity: 0.6;
    background: var(--md-sys-color-surface-variant);
}

.code-input-group {
    display: flex;
    gap: 10px;
}

.code-input-group .form-input {
    flex: 1;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    border: none;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    box-shadow: var(--md-sys-elevation-1);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: var(--md-sys-elevation-2);
    filter: brightness(1.05);
}

.btn-secondary {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
}

.btn-secondary:hover:not(:disabled) {
    filter: brightness(0.97);
}

.btn-outline {
    background: transparent;
    color: var(--md-sys-color-primary);
    border: 1px solid var(--md-sys-color-outline);
}

[data-theme="dark"] .btn-outline {
    color: var(--md-sys-color-primary);
}

.btn-outline:hover:not(:disabled) {
    background: rgba(103, 80, 164, 0.08);
}

.btn-text {
    background: transparent;
    color: var(--md-sys-color-primary);
    padding: 8px 12px;
}

.btn-text:hover:not(:disabled) {
    background: rgba(103, 80, 164, 0.08);
}

.btn-block {
    width: 100%;
}

.btn-lg {
    padding: 12px 28px;
    font-size: 0.9375rem;
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.8125rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-full);
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 0.875rem;
    color: var(--md-sys-color-on-surface-variant);
}

.auth-footer a {
    color: var(--md-sys-color-primary);
    text-decoration: none;
    font-weight: 500;
}

/* Language / Theme Segmented Buttons */
.segmented-group {
    display: inline-flex;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--radius-full);
    padding: 4px;
    gap: 4px;
}

.segmented-item {
    padding: 8px 16px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    user-select: none;
}

.segmented-item.active {
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-primary);
    box-shadow: var(--md-sys-elevation-1);
}

.segmented-item i {
    width: 16px;
    height: 16px;
}

.language-selector {
    position: absolute;
    top: 20px;
    right: 20px;
}

/* Custom Select Menu */
.md3-menu {
    position: relative;
    display: inline-block;
}

.md3-menu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--radius-xs);
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    font-size: 0.875rem;
    cursor: pointer;
    min-width: 160px;
    transition: border-color 0.15s;
}

.md3-menu-trigger:hover {
    border-color: var(--md-sys-color-on-surface-variant);
}

.md3-menu-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 180px;
    background: var(--md-sys-color-surface);
    border-radius: var(--radius-sm);
    box-shadow: var(--md-sys-elevation-3);
    border: 1px solid var(--md-sys-color-outline-variant);
    padding: 8px 0;
    z-index: 2000;
    opacity: 0;
    transform: scale(0.96);
    pointer-events: none;
    transition: opacity 0.15s, transform 0.15s;
}

.md3-menu.open .md3-menu-dropdown {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

.md3-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--md-sys-color-on-surface);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background 0.12s;
}

.md3-menu-item:hover {
    background: rgba(103, 80, 164, 0.08);
}

.md3-menu-item.active {
    color: var(--md-sys-color-primary);
}

.md3-menu-item i {
    width: 18px;
    height: 18px;
    color: var(--md-sys-color-on-surface-variant);
}

.md3-menu-item.active i {
    color: var(--md-sys-color-primary);
}

/* Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--md-sys-color-surface);
    border-right: 1px solid var(--md-sys-color-outline-variant);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px 24px;
}

.sidebar-logo-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary-container);
    overflow: hidden;
    padding: 8px;
    flex-shrink: 0;
}

.sidebar-logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.sidebar-logo-icon i {
    width: 24px;
    height: 24px;
}

.sidebar-logo-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--md-sys-color-on-surface);
}

.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-full);
    color: var(--md-sys-color-on-surface-variant);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.15s, color 0.15s;
    cursor: pointer;
}

.nav-item:hover {
    background: var(--md-sys-color-surface-variant);
    color: var(--md-sys-color-on-surface);
}

.nav-item.active {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
}

.nav-item i {
    width: 20px;
    height: 20px;
}

.sidebar-footer {
    padding-top: 16px;
    border-top: 1px solid var(--md-sys-color-outline-variant);
}

.user-mini {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background 0.15s;
}

.user-mini:hover {
    background: var(--md-sys-color-surface-variant);
}

.user-mini-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--md-sys-color-surface-variant);
    flex-shrink: 0;
}

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

.user-mini-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-mini-email {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 32px;
    min-height: 100vh;
    background: var(--md-sys-color-surface);
}

.page-header {
    margin-bottom: 28px;
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--md-sys-color-on-surface);
}

.page-header p {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.875rem;
}

/* Cards */
.card {
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--md-sys-elevation-1);
}

.card-title {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--md-sys-color-on-surface);
}

/* Dashboard */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
}

.welcome-card {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--md-sys-color-primary-container);
    border: none;
}

.welcome-card .welcome-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: var(--md-sys-color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary);
    flex-shrink: 0;
}

.welcome-card h2 {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--md-sys-color-on-primary-container);
    margin-bottom: 4px;
}

.welcome-card p {
    color: var(--md-sys-color-on-primary-container);
    opacity: 0.8;
    font-size: 0.875rem;
}

.storage-card {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 28px;
}

.storage-chart-container {
    position: relative;
    width: 160px;
    height: 160px;
    flex-shrink: 0;
}

.storage-chart-center {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.storage-percent {
    font-size: 1.75rem;
    font-weight: 500;
    color: var(--md-sys-color-primary);
}

.storage-label {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
}

.storage-info {
    flex: 1;
}

.storage-info h3 {
    font-size: 1.125rem;
    margin-bottom: 6px;
    font-weight: 500;
}

.storage-info p {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.875rem;
    margin-bottom: 20px;
}

.storage-legend {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.875rem;
    color: var(--md-sys-color-on-surface-variant);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.recent-files-card {
    min-height: 320px;
}

.file-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.file-list-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px;
    border-radius: var(--radius-xs);
    transition: background 0.15s;
    cursor: pointer;
}

.file-list-item:hover {
    background: var(--md-sys-color-surface-variant);
}

.file-list-item .file-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--md-sys-color-surface-variant);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-primary);
    flex-shrink: 0;
}

.file-list-item .file-icon.folder {
    color: var(--md-sys-color-tertiary);
    background: var(--md-sys-color-tertiary-container);
}

.file-list-item .file-icon.image {
    color: #2E7D32;
    background: #E8F5E9;
}

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

.file-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
}

/* Files Page */
.files-toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    font-size: 0.875rem;
    flex-wrap: wrap;
}

.breadcrumb-item {
    color: var(--md-sys-color-primary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-xs);
    transition: background 0.12s;
    font-weight: 500;
}

.breadcrumb-item:hover {
    background: rgba(103, 80, 164, 0.08);
}

.breadcrumb-item:last-child {
    color: var(--md-sys-color-on-surface);
    font-weight: 500;
    cursor: default;
}

.breadcrumb-item:last-child:hover {
    background: transparent;
}

.breadcrumb-separator {
    color: var(--md-sys-color-outline);
}

.files-actions {
    display: flex;
    gap: 8px;
}

.upload-zone {
    border: 2px dashed var(--md-sys-color-outline);
    border-radius: var(--radius-lg);
    padding: 36px;
    text-align: center;
    margin-bottom: 24px;
    transition: all 0.2s;
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
}

.upload-zone.dragover {
    border-color: var(--md-sys-color-primary);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.upload-zone-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary-container);
    margin: 0 auto 16px;
}

.upload-zone h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    margin-bottom: 4px;
}

.upload-zone p {
    font-size: 0.875rem;
}

/* Upload Progress */
.upload-progress-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.upload-progress-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--radius-md);
    box-shadow: var(--md-sys-elevation-1);
}

.upload-progress-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary-container);
    flex-shrink: 0;
}

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

.upload-progress-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 6px;
}

.upload-progress-bar {
    height: 4px;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.upload-progress-fill {
    height: 100%;
    background: var(--md-sys-color-primary);
    border-radius: var(--radius-full);
    transition: width 0.2s;
}

.upload-progress-text {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
    min-width: 40px;
    text-align: right;
}

/* Files Grid */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.files-grid.list-view {
    grid-template-columns: 1fr;
}

.file-card {
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--radius-md);
    padding: 16px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
    position: relative;
}

.file-card:hover {
    background: var(--md-sys-color-surface-variant);
    box-shadow: var(--md-sys-elevation-1);
}

.files-grid.list-view .file-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
}

.file-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--md-sys-color-surface-variant);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-primary);
    margin-bottom: 12px;
}

.files-grid.list-view .file-card-icon {
    margin-bottom: 0;
    width: 44px;
    height: 44px;
}

.file-card-icon.folder {
    background: var(--md-sys-color-tertiary-container);
    color: var(--md-sys-color-on-tertiary-container);
}

.file-card-icon.image {
    background: #E8F5E9;
    color: #2E7D32;
}

.file-card-icon.archive {
    background: #E3F2FD;
    color: #1565C0;
}

.file-card-icon.video {
    background: #FCE4EC;
    color: #C2185B;
}

.file-card-icon.audio {
    background: #FFF3E0;
    color: #E65100;
}

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

.file-card-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.file-card-meta {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
}

.file-card-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity 0.15s;
}

.file-card:hover .file-card-actions {
    opacity: 1;
}

.files-grid.list-view .file-card-actions {
    opacity: 1;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: none;
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
}

.icon-btn:hover {
    background: rgba(103, 80, 164, 0.08);
    color: var(--md-sys-color-on-surface);
}

.icon-btn.danger:hover {
    background: var(--md-sys-color-error-container);
    color: var(--md-sys-color-error);
}

/* Context Menu */
.context-menu {
    position: fixed;
    min-width: 200px;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--radius-sm);
    box-shadow: var(--md-sys-elevation-3);
    padding: 8px 0;
    z-index: 3000;
    opacity: 0;
    transform: scale(0.96);
    animation: menuIn 0.15s ease forwards;
}

@keyframes menuIn {
    to { opacity: 1; transform: scale(1); }
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--md-sys-color-on-surface);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background 0.12s;
}

.context-menu-item:hover {
    background: rgba(103, 80, 164, 0.08);
}

.context-menu-item i {
    width: 18px;
    height: 18px;
    color: var(--md-sys-color-on-surface-variant);
}

.context-menu-item.danger {
    color: var(--md-sys-color-error);
}

.context-menu-item.danger i {
    color: var(--md-sys-color-error);
}

.context-menu-divider {
    height: 1px;
    background: var(--md-sys-color-outline-variant);
    margin: 8px 0;
}

/* FAB */
.fab {
    position: fixed;
    right: 32px;
    bottom: 32px;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-xl);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--md-sys-elevation-3);
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
    z-index: 50;
}

.fab:hover {
    box-shadow: var(--md-sys-elevation-2);
    filter: brightness(1.05);
}

.fab:active {
    transform: scale(0.96);
}

.fab i {
    width: 24px;
    height: 24px;
}

/* Settings */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 24px;
}

.avatar-upload {
    display: flex;
    align-items: center;
    gap: 20px;
}

.avatar-preview {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--md-sys-color-surface-variant);
    border: 2px solid var(--md-sys-color-outline-variant);
}

.avatar-placeholder {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary-container);
}

.avatar-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.theme-options {
    display: flex;
    gap: 12px;
}

.theme-option {
    flex: 1;
    padding: 16px 12px;
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: all 0.15s;
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface-variant);
}

.theme-option:hover {
    border-color: var(--md-sys-color-outline);
}

.theme-option.active {
    border-color: var(--md-sys-color-primary);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.theme-option i {
    margin-bottom: 8px;
    width: 24px;
    height: 24px;
}

.devices-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.device-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px;
    border-radius: var(--radius-xs);
    background: var(--md-sys-color-surface-variant);
}

.device-item i {
    color: var(--md-sys-color-on-surface-variant);
}

.device-info {
    flex: 1;
}

.device-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
}

.device-meta {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(28, 27, 31, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 4000;
    padding: 24px;
    opacity: 0;
    animation: fadeIn 0.2s ease forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

.modal {
    background: var(--md-sys-color-surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 420px;
    box-shadow: var(--md-sys-elevation-3);
    transform: scale(0.92);
    animation: modalIn 0.2s ease forwards;
    overflow: hidden;
}

@keyframes modalIn {
    to { transform: scale(1); }
}

.modal-header {
    padding: 20px 24px 0;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
}

.modal-body {
    padding: 20px 24px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.875rem;
}

.modal-footer {
    padding: 16px 24px 24px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Toast */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 5000;
}

.toast {
    background: var(--md-sys-color-inverse-surface);
    color: var(--md-sys-color-inverse-on-surface);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    box-shadow: var(--md-sys-elevation-3);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 280px;
    max-width: 420px;
    animation: slideInRight 0.3s ease;
    font-size: 0.875rem;
}

.toast i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast.success {
    background: var(--md-sys-color-inverse-surface);
}

.toast.error {
    background: var(--md-sys-color-error-container);
    color: var(--md-sys-color-on-error-container);
}

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

/* Bottom Nav (Mobile) */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--md-sys-color-surface);
    border-top: 1px solid var(--md-sys-color-outline-variant);
    z-index: 100;
    padding: 8px 16px 12px;
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--md-sys-color-on-surface-variant);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 500;
    transition: color 0.15s;
    border-radius: var(--radius-full);
    padding: 6px;
}

.bottom-nav-item.active {
    color: var(--md-sys-color-primary);
}

.bottom-nav-item i {
    width: 24px;
    height: 24px;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 20px;
    color: var(--md-sys-color-on-surface-variant);
    grid-column: 1 / -1;
}

.empty-state-icon {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--md-sys-color-surface-variant);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-outline);
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--md-sys-color-on-surface);
}

.empty-state p {
    font-size: 0.875rem;
    max-width: 320px;
}

/* Utility */
.text-muted { color: var(--md-sys-color-on-surface-variant); }
.text-primary { color: var(--md-sys-color-primary); }
.text-error { color: var(--md-sys-color-error); }
.text-success { color: #2E7D32; }
.hidden { display: none !important; }

.skeleton {
    background: linear-gradient(90deg, var(--md-sys-color-surface-variant) 25%, var(--md-sys-color-outline-variant) 50%, var(--md-sys-color-surface-variant) 75%);
    background-size: 200% 100%;
    animation: skeleton 1.5s infinite;
    border-radius: 8px;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .storage-card {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
        padding-bottom: calc(var(--bottom-nav-height) + 20px);
    }

    .bottom-nav {
        display: flex;
    }

    .fab {
        right: 20px;
        bottom: calc(var(--bottom-nav-height) + 20px);
    }

    .files-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .files-actions {
        justify-content: flex-end;
    }

    .auth-card {
        padding: 24px 20px;
    }

    .page-header h1 {
        font-size: 1.375rem;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .theme-options {
        flex-direction: column;
    }

    .language-selector {
        position: static;
        margin-bottom: 16px;
        text-align: right;
    }

    .context-menu {
        position: fixed;
        left: 16px !important;
        right: 16px !important;
        bottom: 16px !important;
        top: auto !important;
        min-width: auto;
        transform: translateY(100%);
        animation: menuSlideUp 0.25s ease forwards;
    }

    @keyframes menuSlideUp {
        to { transform: translateY(0); }
    }

    .toast-container {
        left: 16px;
        right: 16px;
        top: 16px;
    }

    .toast {
        min-width: auto;
        max-width: none;
    }
}