:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --secondary: #06b6d4;
    --success: #10b981;
    --danger: #f43f5e;
    --warning: #f59e0b;
    --info: #06b6d4;
    --light: #f8fafc;
    --dark: #0f172a;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --border-radius: 0.75rem;
    --box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05), 0 4px 6px -1px rgba(0, 0, 0, 0.02);
    --box-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 0.9375rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--gray-50);
}

/* 页面容器 */
.container {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 240px;
    background: linear-gradient(180deg, var(--white) 0%, #fafbfc 100%);
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

.sidebar.collapsed {
    width: 64px;
}

.sidebar.collapsed .logo-text,
.sidebar.collapsed .nav-link span,
.sidebar.collapsed .nav-dropdown-toggle span,
.sidebar.collapsed .user-info {
    display: none;
}

.sidebar.collapsed .nav-link {
    padding: 0.75rem;
    justify-content: center;
    margin: 0.25rem 0.5rem;
}

.sidebar.collapsed .nav-icon {
    margin-right: 0;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    background: linear-gradient(180deg, var(--white) 0%, #fafbfc 100%);
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--gray-800);
    transition: transform 0.2s ease;
}

.logo:hover {
    transform: translateX(4px);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.75rem;
    color: var(--white);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
    transition: all 0.3s ease;
}

.logo:hover .logo-icon {
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.45);
    transform: rotate(5deg) scale(1.05);
}

.logo-text {
    font-size: 1.125rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 导航菜单 */
.nav-menu {
    padding: 1rem 0;
}

.nav-item {
    list-style: none;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--gray-600);
    text-decoration: none;
    transition: all 0.25s ease;
    border-left: 3px solid transparent;
    margin: 0.25rem 0.75rem;
    border-radius: 0 8px 8px 0;
    position: relative;
}

.nav-link:hover {
    background: linear-gradient(90deg, var(--primary-light) 0%, transparent 100%);
    color: var(--primary);
    border-left-color: var(--primary);
    padding-left: 1.75rem;
}

.nav-link.active {
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: var(--white);
    border-left-color: var(--primary);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 60%;
    background: var(--white);
    border-radius: 0 4px 4px 0;
}

.nav-icon {
    margin-right: 0.75rem;
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
    transition: transform 0.25s ease;
}

.nav-link:hover .nav-icon {
    transform: scale(1.1);
}

.submenu {
    display: none;
    list-style: none;
    padding: 0.5rem 0;
    margin: 0;
    background: linear-gradient(180deg, rgba(79, 70, 229, 0.03) 0%, transparent 100%);
    border-radius: 8px;
}

.submenu.show {
    display: block;
}

.submenu-item {
    list-style: none;
}

.submenu-link {
    display: flex;
    align-items: center;
    padding: 0.625rem 1rem 0.625rem 3rem;
    color: var(--gray-500);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    margin: 0.125rem 0.75rem;
    border-radius: 6px;
}

.submenu-link:hover {
    background: linear-gradient(90deg, rgba(79, 70, 229, 0.1) 0%, transparent 100%);
    color: var(--primary);
    padding-left: 3.25rem;
}

.submenu-link.active {
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}

.submenu-link i {
    margin-right: 0.5rem;
    width: 1rem;
    text-align: center;
    font-size: 0.75rem;
}

.submenu-icon {
    transition: transform 0.3s ease;
}

.has-submenu > .submenu.show ~ .nav-link .submenu-icon,
.has-submenu > .nav-link.active .submenu-icon {
    transform: rotate(90deg);
}

.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.75rem 1.5rem;
    margin: 0.25rem 0.75rem;
    border-radius: 0 8px 8px 0;
    transition: all 0.25s ease;
    cursor: pointer;
    color: var(--gray-600);
}

.nav-dropdown-toggle:hover {
    background: linear-gradient(90deg, var(--primary-light) 0%, transparent 100%);
    color: var(--primary);
}

.nav-dropdown-toggle.active {
    color: var(--primary);
}

.nav-dropdown-toggle .arrow {
    transition: transform 0.3s ease;
}

.nav-dropdown-toggle.active .arrow {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    display: none;
    background: var(--white);
    border-left: 3px solid var(--primary);
    border-radius: 0 0 8px 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin: -4px 0.75rem 0.75rem 2.25rem;
}

.nav-dropdown-menu.show {
    display: block;
}

.nav-dropdown-item {
    list-style: none;
}

.nav-dropdown-link {
    display: flex;
    align-items: center;
    padding: 0.625rem 1.5rem;
    color: var(--gray-600);
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.nav-dropdown-link:hover {
    background: linear-gradient(90deg, var(--primary-light) 0%, transparent 100%);
    color: var(--primary);
}

.nav-dropdown-link.active {
    color: var(--primary);
    font-weight: 500;
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: 240px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.main-content.expanded {
    margin-left: 64px;
}

/* 顶部导航栏 */
.top-nav {
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 90;
}

.top-nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--gray-500);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background-color: var(--gray-100);
    color: var(--primary);
}

.page-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
}

.top-nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-menu {
    position: relative;
}

.user-menu-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: none;
    border: none;
    border-radius: var(--border-radius);
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition);
}

.user-menu-button:hover {
    background-color: var(--gray-100);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 500;
}

.user-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-hover);
    min-width: 180px;
    display: none;
    z-index: 1000;
}

.user-menu-dropdown.show {
    display: block;
}

.user-menu-item {
    list-style: none;
}

.user-menu-link {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--gray-700);
    text-decoration: none;
    transition: var(--transition);
}

.user-menu-link:hover {
    background-color: var(--primary-light);
    color: var(--primary);
}

/* 内容区域 */
.content {
    flex: 1;
    padding: 2rem;
}

/* 内容占位符 */
#content-placeholder {
    flex: 1;
    padding: 2rem;
}

/* 卡片 */
.card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

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

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(to bottom, var(--gray-50), var(--white));
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
}

.card-actions {
    display: flex;
    gap: 0.5rem;
}

.card-body {
    padding: 1.5rem;
}

/* 统计卡片网格 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 统计卡片 */
.stat-card {
    position: relative;
    display: flex;
    align-items: center;
    padding: 1.5rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card .stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
    margin-right: 1.25rem;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.stat-card .stat-content {
    flex: 1;
    position: relative;
    z-index: 1;
}

.stat-card .stat-label {
    margin: 0 0 0.25rem 0;
    font-size: 0.875rem;
    color: var(--gray-500);
    font-weight: 500;
}

.stat-card .stat-value {
    margin: 0;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-800);
    line-height: 1.2;
}

.stat-card .stat-arrow {
    position: absolute;
    right: 1.5rem;
    color: var(--gray-300);
    font-size: 0.875rem;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateX(-10px);
}

.stat-card:hover .stat-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* 统计卡片颜色变体 */
.stat-card-primary .stat-icon {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.35);
}

.stat-card-primary::before {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.05) 100%);
}

.stat-card-primary:hover .stat-arrow {
    color: #667eea;
}

.stat-card-success .stat-icon {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    box-shadow: 0 8px 16px rgba(17, 153, 142, 0.35);
}

.stat-card-success::before {
    background: linear-gradient(135deg, rgba(17, 153, 142, 0.1) 0%, rgba(56, 239, 125, 0.05) 100%);
}

.stat-card-success:hover .stat-arrow {
    color: #11998e;
}

.stat-card-warning .stat-icon {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    box-shadow: 0 8px 16px rgba(245, 87, 108, 0.35);
}

.stat-card-warning::before {
    background: linear-gradient(135deg, rgba(245, 87, 108, 0.1) 0%, rgba(240, 147, 251, 0.05) 100%);
}

.stat-card-warning:hover .stat-arrow {
    color: #f5576c;
}

.stat-card-info .stat-icon {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    box-shadow: 0 8px 16px rgba(79, 195, 254, 0.35);
}

.stat-card-info::before {
    background: linear-gradient(135deg, rgba(79, 195, 254, 0.1) 0%, rgba(0, 242, 254, 0.05) 100%);
}

.stat-card-info:hover .stat-arrow {
    color: #4facfe;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: var(--white);
    border-color: var(--primary);
    box-shadow: 0 1px 2px 0 rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary));
    transform: translateY(-1px);
    box-shadow: 0 4px 12px 0 rgba(79, 70, 229, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: var(--white);
    border-color: var(--success);
    box-shadow: 0 1px 2px 0 rgba(16, 185, 129, 0.2);
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669, var(--success));
    transform: translateY(-1px);
    box-shadow: 0 4px 12px 0 rgba(16, 185, 129, 0.3);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #e11d48);
    color: var(--white);
    border-color: var(--danger);
    box-shadow: 0 1px 2px 0 rgba(244, 63, 94, 0.2);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #e11d48, var(--danger));
    transform: translateY(-1px);
    box-shadow: 0 4px 12px 0 rgba(244, 63, 94, 0.3);
}

.btn-outline {
    background-color: var(--white);
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.btn-outline:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    color: var(--primary);
}

/* 标签页 */
.tabs {
    margin-bottom: 1.5rem;
}

.tab-nav {
    display: flex;
    border-bottom: 2px solid var(--gray-100);
    margin-bottom: 1.5rem;
}

.tab-btn {
    padding: 0.875rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

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

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 表单 */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.5;
    color: var(--gray-700);
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--gray-700);
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* 单选框和复选框 */
.form-check {
    margin-bottom: 0.75rem;
}

.form-check-input {
    margin-right: 0.5rem;
}

.form-check-label {
    color: var(--gray-700);
}

/* 开关 */
.form-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.form-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--gray-300);
    transition: var(--transition);
    border-radius: 24px;
}

.switch-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--white);
    transition: var(--transition);
    border-radius: 50%;
}

input:checked + .switch-slider {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

input:checked + .switch-slider:before {
    transform: translateX(26px);
}

/* 网格布局 */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -0.75rem;
}

.col {
    flex: 1;
    padding: 0 0.75rem;
}

.col-6 {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 0 0.75rem;
}

/* API 响应区域 */
.api-response {
    height: 400px;
    background-color: var(--gray-50);
    border: 1px dashed var(--gray-300);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    overflow: auto;
}

.api-response:hover {
    border-color: var(--primary);
}

.api-response-content {
    text-align: left;
}

.api-response-body {
    background-color: #f5f5f5;
    color: #333;
    padding: 1.25rem;
    border-radius: var(--border-radius);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 0.8125rem;
    line-height: 1.6;
    overflow-x: auto;
}

.json-object,
.json-array {
    list-style: none;
    padding-left: 1.5rem;
    margin: 0;
}

.json-key {
    color: #166534 !important;
    font-weight: 500;
}

.json-string {
    color: #333;
}

.json-number {
    color: #333;
}

.json-boolean {
    color: #333;
}

.json-null {
    color: #666;
    font-style: italic;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.table th,
.table td {
    padding: 0.875rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-100);
}

.table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tr:hover {
    background-color: var(--gray-50);
}

.table-responsive {
    overflow-x: auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

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

    .col-6 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .content {
        padding: 1.25rem;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .card-actions {
        width: 100%;
        justify-content: flex-end;
    }
    
    .btn {
        padding: 0.5rem 0.875rem;
        font-size: 0.8125rem;
        gap: 0.375rem;
    }
    
    .action-buttons {
        flex-wrap: wrap;
    }
    
    .action-buttons .btn {
        flex: 1;
        min-width: 80px;
    }
    
    .table th,
    .table td {
        padding: 0.625rem;
        font-size: 0.8125rem;
    }
}

/* 全局加载动画 */
.global-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.loader-content {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-hover);
    text-align: center;
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 消息提示 */
.toast {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-hover);
    z-index: 9998;
    animation: slideIn 0.3s ease-out;
}

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

.toast.error {
    background: linear-gradient(135deg, var(--danger), #e11d48);
    color: var(--white);
}

.toast.info {
    background: linear-gradient(135deg, var(--info), #0891b2);
    color: var(--white);
}

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

/* 模态框样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-hover);
    width: 90%;
    max-width: 500px;
    animation: fadeIn 0.3s ease-out;
}

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

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(to bottom, var(--gray-50), var(--white));
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--gray-500);
    cursor: pointer;
    padding: 0.375rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.modal-close:hover {
    background-color: var(--gray-100);
    color: var(--gray-700);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--gray-100);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}