:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --sidebar-width: 200px;
    --sidebar-collapsed: 64px;
    --header-height: 64px;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    overflow: hidden;
}

.app {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* ========== 侧边栏 ========== */
.sidebar {
    width: var(--sidebar-width);
    background: #ffffff;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
    flex-shrink: 0;
    overflow-y: auto;
    overflow-x: hidden;
    border-right: 1px solid var(--border);
    box-shadow: 2px 0 8px rgba(0,0,0,0.04);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    height: auto;
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 16px 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.logo i {
    font-size: 24px;
    color: var(--primary);
    flex-shrink: 0;
}

.sidebar.collapsed .logo span {
    display: none;
}

.sidebar-nav {
    padding: 12px 0;
    flex: 1;
}

.nav-group {
    margin-bottom: 4px;
}

.nav-group-title {
    padding: 8px 20px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 600;
}

.sidebar.collapsed .nav-group-title {
    display: none;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    gap: 12px;
    white-space: nowrap;
    border-left: 3px solid transparent;
    position: relative;
}

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

.nav-item.active {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
    border-left-color: var(--primary);
    font-weight: 600;
}

.nav-item i {
    font-size: 18px;
    flex-shrink: 0;
    width: 20px;
    text-align: center;
}

.nav-item .arrow {
    margin-left: auto;
    font-size: 12px;
    transition: transform 0.2s;
}

.nav-item .arrow.rotated {
    transform: rotate(90deg);
}

.sidebar.collapsed .nav-item .arrow,
.sidebar.collapsed .nav-item span:not(.badge) {
    display: none;
}

.nav-submenu {
    display: none;
    padding-left: 20px;
}

.nav-submenu.open {
    display: block;
}

.nav-submenu .nav-item {
    padding-left: 52px;
    font-size: 13px;
}

.sidebar.collapsed .nav-submenu {
    display: none !important;
}

/* ========== 主内容区 ========== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

/* ========== 顶部Header ========== */
.top-header {
    height: var(--header-height);
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 4px;
}

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

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 6px 12px;
    gap: 8px;
    width: 260px;
}

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

.search-box input {
    border: none;
    background: none;
    outline: none;
    font-size: 13px;
    width: 100%;
    color: var(--text-primary);
}

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

.action-btn {
    position: relative;
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: var(--radius);
    transition: background 0.2s;
}

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

.action-btn .badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 16px;
    height: 16px;
    background: var(--danger);
    color: #fff;
    font-size: 10px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-dropdown {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius);
    transition: background 0.2s;
}

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

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.user-name {
    font-weight: 500;
    font-size: 13px;
}

/* ========== 页面容器 ========== */
.page-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

/* ========== 通用组件 ========== */
.page-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

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

.card-title {
    font-size: 15px;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

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

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

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

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

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-link {
    background: none;
    color: var(--primary);
    padding: 4px 8px;
}

.btn-link:hover {
    background: rgba(37, 99, 235, 0.08);
}

/* 表格 */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.data-table tr:hover td {
    background: rgba(241, 245, 249, 0.5);
}

.data-table .actions {
    display: flex;
    gap: 4px;
}

/* 标签 */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.tag-green {
    background: #d1fae5;
    color: #065f46;
}

.tag-yellow {
    background: #fef3c7;
    color: #92400e;
}

.tag-red {
    background: #fee2e2;
    color: #991b1b;
}

.tag-blue {
    background: #dbeafe;
    color: #1e40af;
}

.tag-gray {
    background: #f1f5f9;
    color: #475569;
}

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

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    outline: none;
    transition: border 0.2s;
    color: var(--text-primary);
}

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

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

/* 筛选栏 */
.filter-bar {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.filter-bar .form-input,
.filter-bar .form-select,
.filter-bar .multiselect-dropdown {
    width: auto;
    min-width: 140px;
}

.filter-bar .multiselect-trigger {
    width: 100%;
    box-sizing: border-box;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.filter-group label {
    white-space: nowrap;
    flex-shrink: 0;
    font-size: 13px;
    color: var(--text-secondary);
}

/* 分页 */
.pagination {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 4px;
    padding: 16px 0;
}

.pagination button {
    padding: 6px 12px;
    border: 1px solid var(--border);
    background: var(--card-bg);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
}

.pagination button:hover {
    background: var(--bg);
}

.pagination button.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 统计卡片 */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border);
    padding: 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.stat-icon.blue { background: #dbeafe; color: #2563eb; }
.stat-icon.green { background: #d1fae5; color: #10b981; }
.stat-icon.orange { background: #ffedd5; color: #f97316; }
.stat-icon.red { background: #fee2e2; color: #ef4444; }
.stat-icon.purple { background: #f3e8ff; color: #a855f7; }
.stat-icon.cyan { background: #cffafe; color: #06b6d4; }

.stat-info {
    flex: 1;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-change {
    font-size: 12px;
    margin-top: 4px;
}

.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* 标签页 */
.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.tab-item {
    padding: 10px 16px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

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

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

/* 步骤条 */
.steps {
    display: flex;
    gap: 0;
    margin-bottom: 24px;
}

.step {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    position: relative;
}

.step-number {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.step.active .step-number {
    background: var(--primary);
    color: #fff;
}

.step.completed .step-number {
    background: var(--success);
    color: #fff;
}

.step-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.step.active .step-label {
    color: var(--primary);
}

/* 模态框 */
.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: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

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

.modal {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.95);
    transition: transform 0.3s;
}

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

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

.modal-title {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* 空状态 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state p {
    font-size: 14px;
}

/* 两列布局 */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* 详情布局 */
.detail-section {
    margin-bottom: 24px;
}

.detail-section-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 24px;
}

.detail-item {
    display: flex;
    gap: 8px;
}

.detail-label {
    color: var(--text-secondary);
    font-size: 13px;
    min-width: 80px;
}

.detail-value {
    font-weight: 500;
    font-size: 13px;
}

/* 文件上传 */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s;
}

.upload-zone:hover {
    border-color: var(--primary);
}

.upload-zone i {
    font-size: 36px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

/* 树形结构 */
.tree-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    cursor: pointer;
    border-radius: var(--radius);
    transition: background 0.2s;
}

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

.tree-item i {
    color: var(--text-muted);
    font-size: 16px;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar { position: fixed; z-index: 100; left: -260px; }
    .sidebar.open { left: 0; }
    .search-box { display: none; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .two-col { grid-template-columns: 1fr; }
}

/* ========== 侧边栏底部用户信息 ========== */
.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.sidebar.collapsed .sidebar-footer {
    padding: 16px 12px;
}

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

.sidebar.collapsed .user-info {
    justify-content: center;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.user-meta {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.sidebar.collapsed .user-meta {
    display: none;
}

.user-meta .user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.user-meta .user-role {
    font-size: 12px;
    color: var(--text-muted);
}

/* ========== 侧边栏 Logo 新样式 ========== */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
}

.logo-img {
    width: 60px;
    height: auto;
    flex-shrink: 0;
    display: block;
}

.logo-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    line-height: 1.2;
}

.logo-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.logo-sub {
    font-size: 10px;
    font-weight: 400;
    color: var(--text-muted);
    margin-top: 2px;
}

.sidebar.collapsed .logo-text {
    display: none;
}

.sidebar.collapsed .logo-img {
    width: 30px;
}

/* ========== 登录页 ========== */
.login-page {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    z-index: 2000;
}

.login-page-inner {
    display: flex;
    width: 900px;
    height: 560px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.12);
    overflow: hidden;
}

.login-left {
    width: 285px;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 30px 24px;
    color: #fff;
    overflow: hidden;
}

.login-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 2;
}

.login-logo-img {
    width: 70px;
    height: auto;
    flex-shrink: 0;
}

.login-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.login-brand-title {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.5px;
}

.login-brand-sub {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-muted);
    margin-top: 3px;
}

.login-slogan {
    z-index: 2;
    margin-top: auto;
    margin-bottom: 40px;
}

.login-slogan-line {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.login-slogan-line::before {
    content: '';
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--primary-light);
    flex-shrink: 0;
}

.login-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.login-deco-circle {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.08);
    top: -80px;
    right: -100px;
}

.login-deco-circle-2 {
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.05);
    bottom: -40px;
    left: -60px;
}

.login-deco-dots {
    position: absolute;
    width: 120px;
    height: 120px;
    bottom: 80px;
    right: 40px;
    background-image: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 16px 16px;
}

.login-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 48px;
}

.login-panel {
    width: 100%;
    max-width: 360px;
}

.login-panel-header {
    margin-bottom: 32px;
}

.login-panel-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.login-panel-logo {
    width: 80px;
    height: auto;
    flex-shrink: 0;
    background: rgba(255,255,255,0.15);
    border-radius: 8px;
    padding: 6px;
}

.login-panel-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.login-panel-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.login-panel-sub {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

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

.login-form .form-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.login-input-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0 12px;
    transition: border-color 0.2s;
}

.login-input-wrap:focus-within {
    border-color: var(--primary);
}

.login-input-wrap i {
    font-size: 18px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.login-input-wrap .form-input {
    border: none;
    background: none;
    padding: 10px 0;
    flex: 1;
    outline: none;
    font-size: 14px;
}

.captcha-wrap .form-input {
    flex: 1;
}

.captcha-img {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary);
    background: #dbeafe;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;
}

.login-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    font-size: 13px;
}

.login-remember {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    cursor: pointer;
}

.login-remember input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.login-forgot {
    color: var(--primary);
    text-decoration: none;
}

.login-forgot:hover {
    text-decoration: underline;
}

.login-submit {
    width: 100%;
    justify-content: center;
    padding: 12px;
    font-size: 15px;
    font-weight: 600;
}

.login-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 768px) {
    .login-page-inner {
        flex-direction: column;
        width: 100%;
        height: 100%;
        border-radius: 0;
    }
    .login-left {
        width: 100%;
        min-height: 180px;
        padding: 20px;
    }
    .login-right {
        padding: 24px;
    }
}