/**
 * 网址导航系统样式文件
 */

/* CSS变量 - 浅色模式 */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #f8f9fa;
    --bg-sidebar: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --border-color: #d2d2d7;
    --border-hover: #a1a1a6;
    --accent-color: #007aff;
    --accent-hover: #0051d5;
    --card-bg: #ffffff;
    --card-hover: #f5f5f7;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
    --logo-icon-color: #1d1d1f;
}

/* CSS变量 - 深色模式 */
[data-theme="dark"] {
    --bg-primary: #1c1c1e;
    --bg-secondary: #000000;
    --bg-tertiary: #2c2c2e;
    --bg-sidebar: #1c1c1e;
    --text-primary: #f5f5f7;
    --text-secondary: #98989d;
    --text-tertiary: #636366;
    --border-color: #38383a;
    --border-hover: #48484a;
    --accent-color: #0a84ff;
    --accent-hover: #409cff;
    --card-bg: #2c2c2e;
    --card-hover: #3a3a3c;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --logo-icon-color: #f5f5f7;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    overflow-x: hidden;
}

/* 登录页面样式 */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.login-logo-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
    gap: 12px;
}

.login-logo-icon {
    width: 48px;
    height: 48px;
    color: #667eea;
    filter: drop-shadow(0 2px 4px rgba(102, 126, 234, 0.3));
}

.login-logo-icon path {
    fill: currentColor;
}

.login-title {
    text-align: center;
    margin: 0;
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 600;
}

/* 页面底部版权信息 */
.page-footer {
    text-align: center;
    padding: 20px;
    color: var(--text-tertiary);
    font-size: 12px;
    line-height: 1.5;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
    width: 100%;
    margin-top: auto;
}

.login-page .page-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: rgba(255, 255, 255, 0.8);
    border-top: none;
    z-index: 1;
}

.page-footer p {
    margin: 0;
}

.page-footer a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.3s;
}

.page-footer a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.login-page .page-footer a {
    color: rgba(255, 255, 255, 0.8);
}

.login-page .page-footer a:hover {
    color: rgba(255, 255, 255, 1);
}

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

.login-form .form-group:has(button) {
    text-align: center;
}

.login-form .btn-block {
    width: auto;
    min-width: 120px;
}

.login-form label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-weight: 500;
}

.login-form input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.error-message {
    color: #ff3b30;
    background: rgba(255, 59, 48, 0.1);
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
    text-align: center;
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

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

.btn-danger {
    background: #ff3b30;
    color: white;
}

.btn-danger:hover {
    background: #ff2d20;
}

.btn-link {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    padding: 4px 12px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

.btn-icon-small {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 4px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

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

/* 左侧边栏 */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 260px;
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform 0.3s ease-in-out, background-color 0.3s, border-color 0.3s;
    will-change: transform;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

/* 侧边栏展开/收起按钮 */
.sidebar-expand-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.sidebar-header {
    padding: 25px;
    min-height: 72px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    box-sizing: border-box;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
}

.logo-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    transition: fill 0.3s;
}

.logo-icon path {
    fill: var(--logo-icon-color);
    transition: fill 0.3s;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.sidebar-section {
    padding: 16px;
    flex: 1;
}

.sidebar-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 分类操作按钮样式 */
.btn-category-action {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn-category-action:hover {
    background: var(--card-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.btn-category-action svg {
    flex-shrink: 0;
}

.btn-category-action span {
    line-height: 1;
}

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

.categories-list.sortable .category-item {
    cursor: move;
    cursor: grab;
}

.categories-list.sortable .category-item:active {
    cursor: grabbing;
}

.categories-list.sortable .category-item.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.category-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 16px;
    position: relative;
}

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

.category-item.active {
    background: var(--accent-color);
    color: white;
}

.category-item.active:hover {
    background: var(--accent-hover);
}

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

.category-count {
    font-size: 11px;
    opacity: 0.7;
    padding: 2px 6px;
    min-width: 20px;
    text-align: center;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.category-item.active .category-count {
    background: rgba(255, 255, 255, 0.2);
}

/* 分类项操作按钮样式 */
.btn-category-item-action {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    opacity: 0;
    flex-shrink: 0;
}

.btn-category-item-action:hover {
    background: var(--card-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
    transform: scale(1.1);
}

.category-item:hover .btn-category-item-action {
    opacity: 1;
}

.category-item.active .btn-category-item-action {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.9);
}

.category-item.active .btn-category-item-action:hover {
    background: rgba(255, 255, 255, 0.25);
    color: white;
}

/* category-edit-btn 和 category-delete-btn 样式已合并到 .btn-category-item-action */

/* 设置模式下的样式 */
.categories-list.settings-mode .category-item {
    cursor: move;
    cursor: grab;
}

.categories-list.settings-mode .category-item:active {
    cursor: grabbing;
}

.categories-list.settings-mode .btn-category-item-action {
    opacity: 1;
}

.categories-list.settings-mode .category-item {
    cursor: move;
}

.categories-list.settings-mode .category-item:not(.settings-mode) {
    cursor: move;
}

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

.user-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
}

.username {
    color: var(--text-primary);
    font-weight: 500;
}

/* 主内容区 */
.main-content {
    margin-left: 260px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease-in-out;
    will-change: margin-left;
}

.sidebar.collapsed ~ .main-content {
    margin-left: 0;
}

/* 顶部工具栏 */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 50px 20px 20px;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    transition: background-color 0.3s, border-color 0.3s;
    box-sizing: border-box;
}

.search-box {
    flex: 1;
    max-width: 600px;
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    padding: 10px 40px 10px 40px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 14px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-color);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.search-clear {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-tertiary);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

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

.top-bar-actions {
    display: flex;
    align-items: center;
    gap: 30px;
    margin-left: auto;
}

.top-bar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 4px;
}

.user-info-top {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info-top .username {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
}

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

.bookmarks-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* 分类组 */
.category-group {
    margin-bottom: 40px;
}

.category-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

.category-group-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.category-group-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.btn-bookmark-settings {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.btn-bookmark-settings:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.btn-bookmark-settings svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* 网址网格 */
.bookmarks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.bookmarks-grid.bookmark-settings-mode {
    position: relative;
}

/* 网址卡片 */
.bookmark-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    transition: all 0.2s;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.bookmark-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}

.bookmark-card.bookmark-draggable {
    cursor: move;
}

.bookmark-card.bookmark-draggable:hover {
    cursor: grabbing;
}

.bookmark-card.bookmark-draggable:active {
    cursor: grabbing;
}

.bookmark-card.drag-over-top::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-color);
    z-index: 10;
}

.bookmark-card.drag-over-bottom::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-color);
    z-index: 10;
}

.bookmark-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.bookmark-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
    background: var(--bg-secondary);
}

.bookmark-icon-fallback {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    flex-shrink: 0;
    background: var(--accent-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 18px;
}

.bookmark-title {
    flex: 1;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bookmark-actions {
    display: flex;
    gap: 6px;
    opacity: 0;
    transition: opacity 0.2s;
}

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

/* 网址卡片操作按钮样式 */
.btn-bookmark-action {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.btn-bookmark-action:hover {
    background: var(--card-hover);
    border-color: var(--border-hover);
    transform: scale(1.05);
}

.btn-bookmark-action.btn-edit:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-bookmark-action.btn-delete:hover {
    color: #ff3b30;
    border-color: #ff3b30;
    background: rgba(255, 59, 48, 0.1);
}

.btn-bookmark-action svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.bookmark-info {
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.5;
}

.bookmark-info-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.bookmark-url {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.bookmark-account-icon {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    opacity: 0.7;
}

.bookmark-account-icon svg {
    width: 16px;
    height: 16px;
}

/* 弹窗样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transition: background-color 0.3s;
}

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

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 固定在顶部的弹窗头部 */
.modal-header-fixed {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    margin: 0;
}

.modal-header-fixed h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-tertiary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.2s;
}

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

.modal-body {
    padding: 20px;
    overflow-y: auto;
    max-height: calc(90vh - 80px);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
}

.form-group .required {
    color: #ff3b30;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.2s;
    font-family: inherit;
    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.input-group {
    display: flex;
    gap: 8px;
}

.input-group input {
    flex: 1;
}

.form-hint {
    display: block;
    margin-top: 6px;
    color: var(--text-tertiary);
    font-size: 12px;
}

.icon-preview {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 12px;
}

.icon-preview img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    object-fit: cover;
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.icon-input-group {
    display: flex;
    gap: 8px;
    align-items: center;
}

.icon-input-group input[type="text"] {
    flex: 1;
}

.icon-preview img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    object-fit: cover;
    background: var(--bg-secondary);
}

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

/* 密码字段样式（使用textSecurity隐藏） */
input[data-password-field="true"] {
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
}

input[data-password-field="true"][data-hidden="true"] {
    -webkit-text-security: disc;
}

/* 加载和空状态 */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-tertiary);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-tertiary);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state-small {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        box-shadow: var(--shadow-lg);
    }
    
    /* 移动端默认隐藏侧边栏 */
    .sidebar {
        transform: translateX(-100%);
    }
    
    /* 移动端显示侧边栏时 */
    .sidebar:not(.collapsed) {
        transform: translateX(0);
    }
    
    /* 移动端侧边栏显示时的遮罩层 */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
        backdrop-filter: blur(2px);
    }
    
    .sidebar:not(.collapsed) ~ .sidebar-overlay,
    .sidebar-overlay.show {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    /* 移动端展开按钮始终显示 */
    .sidebar-expand-btn {
        display: flex !important;
    }
    
    .bookmarks-grid {
        grid-template-columns: 1fr;
    }
    
    .top-bar {
        padding: 12px 16px;
    }
    
    .content-area {
        padding: 16px;
    }
    
    .modal-content {
        width: 95%;
        margin: 20px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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