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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #f472b6;
    --accent-color: #22d3ee;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-tertiary: #e5e7eb;
    --border-color: #d1d5db;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar:hover {
    box-shadow: var(--shadow-md);
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.navbar-brand:hover {
    transform: scale(1.02);
}

.navbar-brand i {
    font-size: 28px;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.1);
}

.nav-link.active {
    color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.15);
}

.user-menu {
    position: relative;
    cursor: pointer;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 16px;
    transition: transform var(--transition-fast);
}

.user-avatar:hover {
    transform: scale(1.1);
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
}

.user-menu:hover .user-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown-item {
    padding: 12px 16px;
    color: var(--text-primary);
    text-decoration: none;
    display: block;
    transition: background-color var(--transition-fast);
}

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

.user-dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 8px 0;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    color: white;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: var(--text-secondary);
}

.btn-secondary:hover {
    background: var(--text-primary);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #dc2626);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-sm {
    padding: 6px 16px;
    font-size: 12px;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    transition: all var(--transition-fast);
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

/* 登录注册页面 */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.auth-card {
    width: 100%;
    max-width: 450px;
    padding: 48px;
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 40px;
    color: white;
}

.auth-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

.auth-links {
    text-align: center;
    margin-top: 24px;
}

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

.auth-links a:hover {
    text-decoration: underline;
}

/* 文件列表 */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.file-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 20px;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.file-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.file-card.selected {
    border: 2px solid var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.file-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin: 0 auto 16px;
    background: var(--bg-secondary);
    transition: all var(--transition-fast);
}

.file-card:hover .file-icon {
    transform: scale(1.1);
}

.file-icon.image {
    background: linear-gradient(135deg, #f472b6, #fb7185);
}

.file-icon.document {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.file-icon.archive {
    background: linear-gradient(135deg, #f59e0b, #f97316);
}

.file-icon.audio {
    background: linear-gradient(135deg, #10b981, #34d399);
}

.file-icon.video {
    background: linear-gradient(135deg, #22d3ee, #06b6d4);
}

.file-icon.text {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa);
}

.file-icon.code {
    background: linear-gradient(135deg, #64748b, #94a3b8);
}

.file-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

.file-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 10;
}

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

.file-action-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: rgba(0, 0, 0, 0.5);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.file-action-btn:hover {
    background: var(--primary-color);
    transform: scale(1.1);
}

/* 文件列表视图 */
.file-list {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.file-list-header {
    display: grid;
    grid-template-columns: 40px 1fr 120px 100px 120px 100px;
    padding: 16px 20px;
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
}

.file-list-item {
    display: grid;
    grid-template-columns: 40px 1fr 120px 100px 120px 100px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

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

.file-list-item.selected {
    background-color: rgba(99, 102, 241, 0.1);
}

.file-list-icon {
    font-size: 24px;
}

.file-list-name {
    font-weight: 500;
    color: var(--text-primary);
}

.file-list-meta {
    font-size: 13px;
    color: var(--text-muted);
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 48px 20px;
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    background: white;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 40px;
    color: var(--primary-color);
    transition: all var(--transition-fast);
}

.upload-area:hover .upload-icon {
    transform: scale(1.1);
}

.upload-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 14px;
    color: var(--text-muted);
}

/* 上传进度条 */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 4px;
    transition: width var(--transition-fast);
    animation: progress-shine 2s infinite;
}

@keyframes progress-shine {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
    100% {
        opacity: 1;
    }
}

/* 弹窗样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

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

.modal {
    background: white;
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: all var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--danger-color);
    color: white;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
}

/* 即时反馈：加载中骨架 */
.modal-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    min-height: 160px;
    color: #6b7280;
    font-size: 14px;
}

.spinner {
    width: 28px;
    height: 28px;
    border: 3px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner.small {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

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

/* 媒体预览：加载完成前隐藏内容并显示转圈 */
.modal-media {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
}

.modal-media > .spinner {
    position: absolute;
}

.modal-media > img,
.modal-media > video,
.modal-media > audio {
    opacity: 0;
}

.modal-media.ready > .spinner {
    display: none;
}

.modal-media.ready > img,
.modal-media.ready > video,
.modal-media.ready > audio {
    opacity: 1;
}

.cdn-loading {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #9ca3af;
    font-size: 12px;
    margin: 4px 0 12px;
}

.btn.is-loading,
.file-action-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: white;
    min-height: calc(100vh - 64px);
    padding: 20px;
    border-right: 1px solid var(--border-color);
}

.sidebar-section {
    margin-bottom: 24px;
}

.sidebar-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    padding-left: 8px;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu-item {
    margin-bottom: 4px;
}

.sidebar-menu-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.sidebar-menu-link:hover {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.sidebar-menu-link.active {
    color: white;
    background: var(--primary-color);
}

/* 主内容区 */
.main-content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.stat-icon.users {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
}

.stat-icon.files {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: white;
}

.stat-icon.shares {
    background: linear-gradient(135deg, #f59e0b, #f97316);
    color: white;
}

.stat-icon.space {
    background: linear-gradient(135deg, #22d3ee, #06b6d4);
    color: white;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 空间使用 */
.space-usage {
    background: white;
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 24px;
}

.space-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.space-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.space-info {
    font-size: 14px;
    color: var(--text-secondary);
}

.space-bar {
    height: 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
}

.space-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 6px;
    transition: width var(--transition-slow);
}

/* 搜索框 */
.search-box {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.search-input {
    width: 100%;
    padding: 10px 40px 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-icon {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 18px;
}

/* 分享页面 */
.share-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.share-card {
    width: 100%;
    max-width: 500px;
    text-align: center;
}

.share-icon {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 50px;
    color: white;
}

.share-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.share-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.share-file-info {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 24px;
    text-align: left;
}

.share-file-row {
    display: flex;
    align-items: center;
    gap: 16px;
}

.share-file-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-sm);
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.share-file-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.share-file-size {
    font-size: 13px;
    color: var(--text-muted);
}

/* 通知提示 */
.toast {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 16px 24px;
    border-radius: var(--border-radius);
    font-weight: 500;
    z-index: 3000;
    transform: translateX(120%);
    transition: transform var(--transition-normal);
}

.toast.show {
    transform: translateX(0);
}

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

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

.toast-warning {
    background: var(--warning-color);
    color: white;
}

.toast-info {
    background: var(--primary-color);
    color: white;
}

/* 复选框 */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.checkbox.checked {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox.checked::after {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: bold;
}

/* 筛选排序 */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.sort-select {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: white;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sort-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 公告区域 */
.announcement {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(148, 163, 184, 0.1));
    border-left: 4px solid var(--primary-color);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    padding: 16px 20px;
    margin-bottom: 24px;
}

.announcement-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.announcement-content {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar-nav {
        gap: 10px;
    }
    
    .nav-link {
        padding: 6px 12px;
        font-size: 13px;
    }
    
    .file-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 12px;
    }
    
    .file-card {
        padding: 12px;
    }
    
    .file-icon {
        width: 48px;
        height: 48px;
        font-size: 24px;
        margin-bottom: 8px;
    }
    
    .sidebar {
        width: 200px;
        padding: 12px;
    }
    
    .main-content {
        padding: 12px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .filter-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .auth-card {
        padding: 32px 24px;
    }
}

@media (max-width: 480px) {
    .navbar-content {
        flex-direction: column;
        gap: 12px;
        padding: 12px 16px;
    }
    
    .navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .file-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        width: 100%;
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .main-content {
        padding: 12px;
    }
}

/* 侧边栏文件夹操作按钮 */
.sidebar-folder-btn {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 4px;
    font-size: 12px;
    transition: all 0.2s;
}

.sidebar-folder-btn:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.sidebar-folder-btn:last-child:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.folder-actions {
    display: flex;
    align-items: center;
}