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

:root {
    --primary-color: #4a90d9;
    --primary-hover: #357abd;
    --success-color: #52c41a;
    --danger-color: #ff4d4f;
    --warning-color: #faad14;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-secondary: #666666;
    --border-color: #e8e8e8;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

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

/* 头部导航 */
.header {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.logo i {
    margin-right: 8px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: all 0.3s;
}

.nav-links a:hover {
    background: var(--primary-color);
    color: white;
}

/* 面包屑导航 */
.breadcrumb {
    background: var(--card-bg);
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.breadcrumb-item {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

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

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

.breadcrumb-separator {
    margin: 0 10px;
    color: var(--border-color);
}

/* 工具栏 */
.toolbar {
    background: var(--card-bg);
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
    text-decoration: none;
}

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

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

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

.btn-success:hover {
    background: #45a817;
}

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

.btn-danger:hover {
    background: #e04345;
}

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

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-color);
    border-radius: 6px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 8px;
    outline: none;
    width: 200px;
    font-size: 14px;
}

.search-box i {
    color: var(--text-secondary);
}

/* 文件列表 */
.file-list {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.file-list-header {
    display: grid;
    grid-template-columns: 40px 1fr 120px 150px 100px;
    padding: 12px 20px;
    background: var(--bg-color);
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
}

.file-item {
    display: grid;
    grid-template-columns: 40px 1fr 120px 150px 100px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    transition: background 0.2s;
}

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

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

.file-checkbox input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.file-name {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.file-name i {
    font-size: 24px;
}

.file-name .folder-icon {
    color: #ffc107;
}

.file-name .file-icon {
    color: var(--primary-color);
}

.file-name span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-name:hover span {
    color: var(--primary-color);
}

.file-size,
.file-date {
    color: var(--text-secondary);
    font-size: 14px;
}

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

.file-actions .btn {
    padding: 4px 8px;
    font-size: 12px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 20px;
    color: var(--border-color);
}

.empty-state p {
    font-size: 16px;
}

/* 模态框 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

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

.modal {
    background: var(--card-bg);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow: auto;
    transform: translateY(-20px);
    transition: transform 0.3s;
}

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

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

.modal-header h3 {
    font-size: 18px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    line-height: 1;
}

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

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--bg-color);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(74, 144, 217, 0.05);
}

.upload-area i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.upload-area .upload-hint {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 上传进度 */
.upload-progress {
    margin-top: 20px;
}

.upload-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 6px;
    margin-bottom: 10px;
}

.upload-item-info {
    flex: 1;
}

.upload-item-name {
    font-size: 14px;
    margin-bottom: 5px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.progress-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s;
}

.upload-item-status {
    font-size: 12px;
    color: var(--text-secondary);
}

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

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

/* 分享链接 */
.share-link-box {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.share-link-box input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    background: var(--bg-color);
}

/* 登录页面 */
.login-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, #667eea 100%);
}

.login-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.login-box .form-group {
    margin-bottom: 20px;
}

.login-box .btn {
    width: 100%;
    padding: 12px;
    font-size: 16px;
}

/* 提示消息 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 8px;
    color: white;
    font-size: 14px;
    z-index: 2000;
    transform: translateX(120%);
    transition: transform 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

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

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

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

/* 加载状态 */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 响应式 */
@media (max-width: 768px) {
    .file-list-header,
    .file-item {
        grid-template-columns: 40px 1fr 80px;
    }

    .file-size,
    .file-date {
        display: none;
    }

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

    .toolbar-left,
    .toolbar-right {
        justify-content: center;
        flex-wrap: wrap;
    }

    .search-box input {
        width: 150px;
    }

    .header .container {
        flex-direction: column;
        gap: 15px;
    }

    .modal {
        width: 95%;
        margin: 10px;
    }
}

/* 复选框全选 */
.select-all-checkbox {
    display: flex;
    align-items: center;
}

/* 右键菜单 */
.context-menu {
    position: fixed;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    padding: 8px 0;
    min-width: 160px;
    z-index: 1001;
    display: none;
}

.context-menu.show {
    display: block;
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    cursor: pointer;
    transition: background 0.2s;
}

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

.context-menu-item i {
    width: 16px;
    color: var(--text-secondary);
}

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

/* 拖拽上传样式 */
.file-list.drag-active {
    border: 2px dashed var(--primary-color);
    background: rgba(74, 144, 217, 0.05);
    position: relative;
}

.file-list.drag-active::after {
    content: '松开鼠标上传文件';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(74, 144, 217, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
    color: var(--primary-color);
    font-weight: 500;
    z-index: 10;
    pointer-events: none;
}

/* 上传进度面板 */
.upload-progress-panel {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 360px;
    max-height: 400px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    overflow: hidden;
}

.upload-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--primary-color);
    color: white;
    font-weight: 500;
}

.upload-progress-header i {
    margin-right: 8px;
}

.upload-progress-close {
    background: none;
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.8;
}

.upload-progress-close:hover {
    opacity: 1;
}

.upload-progress-list {
    max-height: 320px;
    overflow-y: auto;
    padding: 10px 0;
}

.upload-progress-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    gap: 12px;
}

.upload-progress-item + .upload-progress-item {
    border-top: 1px solid var(--border-color);
}

.upload-file-icon {
    font-size: 24px;
    color: var(--primary-color);
    width: 30px;
    text-align: center;
}

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

.upload-file-name {
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 6px;
}

.upload-file-progress {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.upload-file-progress-bar {
    height: 100%;
    background: var(--primary-color);
    border-radius: 3px;
    transition: width 0.2s ease;
}

.upload-file-status {
    font-size: 12px;
    min-width: 60px;
    text-align: right;
}

.upload-file-status.uploading {
    color: var(--primary-color);
}

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

.upload-file-status.error {
    color: var(--danger-color);
}

/* 上传清单弹窗样式 */
.upload-queue-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--bg-color);
    margin-bottom: 15px;
}

.upload-queue-area:hover,
.upload-queue-area.dragover {
    border-color: var(--primary-color);
    background: rgba(74, 144, 217, 0.05);
}

.upload-queue-area i {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.upload-queue-area p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 14px;
}

.upload-queue-list {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 15px;
}

.upload-queue-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    background: var(--bg-color);
    border-radius: 6px;
    margin-bottom: 8px;
    gap: 12px;
}

.upload-queue-item:last-child {
    margin-bottom: 0;
}

.upload-queue-item .file-icon {
    font-size: 24px;
    color: var(--primary-color);
    width: 30px;
    text-align: center;
}

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

.upload-queue-item .file-name {
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.upload-queue-item .file-size {
    font-size: 12px;
    color: var(--text-secondary);
}

.upload-queue-item .remove-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 16px;
    transition: color 0.2s;
}

.upload-queue-item .remove-btn:hover {
    color: var(--danger-color);
}

.upload-queue-summary {
    display: flex;
    justify-content: space-between;
    padding: 10px 12px;
    background: var(--bg-color);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-secondary);
}

.upload-queue-summary strong {
    color: var(--text-color);
}