:root {
    --primary-color: #1976D2;
    --primary-light: #42A5F5;
    --primary-dark: #1565C0;
    --secondary-color: #424242;
    --background-color: #F5F5F5;
    --card-background: #FFFFFF;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #F44336;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #E0E0E0;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.2);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
    --asset-color: #4CAF50;
    --debt-color: #F44336;
    --fixed-color: #3F51B5;
    --net-color: #9C27B0;
}

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

body {
    font-family: "Noto Sans SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.app-container {
    display: grid;
    grid-template-columns: 240px 1fr;
    grid-template-rows: 60px 1fr;
    grid-template-areas:
        "header header"
        "sidebar main";
    min-height: 100vh;
}

/* 顶部导航栏 */
.top-nav {
    grid-area: header;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: var(--shadow-md);
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight;
}

.nav-brand: 600 i {
    font-size: 24px;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-size: 14px;
}

.nav-item:hover {
    background: rgba(255,255,255,0.15);
    color: white;
}

.nav-item.active {
    background: rgba(255,255,255,0.25);
    color: white;
}

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

.btn-icon {
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(255,255,255,0.15);
    color: white;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: rgba(255,255,255,0.25);
}

/* 侧边栏 */
.sidebar {
    grid-area: sidebar;
    background: var(--card-background);
    padding: 20px 16px;
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
}

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

.sidebar-section h3 {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.quick-stat {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--background-color);
    border-radius: var(--radius-md);
}

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

.stat-value {
    font-weight: 600;
    font-size: 14px;
}

.stat-value.asset { color: var(--asset-color); }
.stat-value.debt { color: var(--debt-color); }
.stat-value.net { color: var(--net-color); }

.month-selector {
    display: flex;
    gap: 8px;
}

.select-input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: white;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.select-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

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

.category-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    color: var(--text-secondary);
}

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

.category-item.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.category-item i {
    width: 20px;
    text-align: center;
}

/* 主内容区 */
.main-content {
    grid-area: main;
    padding: 24px;
    overflow-y: auto;
    background: var(--background-color);
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

.page.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.page-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

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

/* 统计卡片 */
.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.stat-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.stat-card-icon.asset { background: linear-gradient(135deg, #4CAF50, #45a049); }
.stat-card-icon.debt { background: linear-gradient(135deg, #F44336, #d32f2f); }
.stat-card-icon.net { background: linear-gradient(135deg, #9C27B0, #7B1FA2); }
.stat-card-icon.fixed { background: linear-gradient(135deg, #3F51B5, #303F9F); }

.stat-card-content {
    flex: 1;
}

.stat-card-content h3 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 500;
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-change {
    font-size: 13px;
    font-weight: 500;
}

.stat-change.positive { color: var(--success-color); }
.stat-change.negative { color: var(--danger-color); }
.stat-change.neutral { color: var(--text-secondary); }

/* 图表网格 */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.chart-card {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.chart-card.full-width {
    grid-column: 1 / -1;
}

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

.chart-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.chart-legend {
    display: flex;
    gap: 16px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.legend-item i {
    font-size: 10px;
}

.asset-color { color: var(--asset-color); }
.debt-color { color: var(--debt-color); }
.net-color { color: var(--net-color); }

.chart-body {
    padding: 20px;
    height: 280px;
}

.chart-body.large {
    height: 350px;
}

/* 账户管理 */
.accounts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.account-card {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

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

.account-card.asset { border-left-color: var(--asset-color); }
.account-card.debt { border-left-color: var(--debt-color); }
.account-card.fixed { border-left-color: var(--fixed-color); }

.account-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.account-name {
    font-size: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.account-category-tag {
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 12px;
    background: var(--background-color);
    color: var(--text-secondary);
}

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

.account-actions button {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--background-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.account-actions button:hover {
    background: var(--primary-color);
    color: white;
}

.account-amount {
    font-size: 28px;
    font-weight: 700;
    margin: 12px 0;
}

.account-card.asset .account-amount { color: var(--asset-color); }
.account-card.debt .account-amount { color: var(--debt-color); }
.account-card.fixed .account-amount { color: var(--fixed-color); }

.account-remark {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

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

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

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

/* 登记表格 */
.record-container {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.record-table-wrapper {
    overflow: auto;
}

/* 数据统计 */
.statistics-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.stats-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.summary-card {
    background: var(--card-background);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.summary-card h4 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.summary-card .value {
    font-size: 24px;
    font-weight: 700;
}

.comparison-chart {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    height: 350px;
}

.data-table-wrapper {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--background-color);
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

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

.data-table .positive { color: var(--success-color); }
.data-table .negative { color: var(--danger-color); }

/* 图表分析 */
.analysis-charts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.analysis-charts .full-width {
    grid-column: 1 / -1;
}

/* 切换按钮组 */
.toggle-group {
    display: flex;
    background: var(--background-color);
    border-radius: var(--radius-md);
    padding: 4px;
}

.toggle-btn {
    padding: 8px 20px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

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

/* 弹窗样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    animation: fadeIn 0.2s ease;
}

.modal-content {
    position: relative;
    background: var(--card-background);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

.modal-content.modal-small {
    max-width: 400px;
}

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

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

.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.modal-form {
    padding: 24px;
}

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

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

.form-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.type-selector {
    display: flex;
    gap: 8px;
}

.type-btn {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    background: var(--card-background);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

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

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

.color-input {
    width: 100%;
    height: 44px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 4px;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

/* 设置页面 */
.settings-section {
    margin-bottom: 24px;
}

.settings-section h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

.settings-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.category-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--background-color);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
}

.category-list-item .info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-list-item .color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.category-list-item .delete-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--danger-color);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.category-list-item .delete-btn:hover {
    background: var(--danger-color);
    color: white;
}

/* 提示消息 */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--success-color);
    color: white;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-lg);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 2000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

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

/* 响应式 */
@media (max-width: 1200px) {
    .chart-grid {
        grid-template-columns: 1fr;
    }

    .analysis-charts {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 992px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "main";
    }

    .sidebar {
        display: none;
    }

    .nav-menu {
        display: none;
    }
}

@media (max-width: 768px) {
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .stats-cards {
        grid-template-columns: 1fr;
    }

    .accounts-grid {
        grid-template-columns: 1fr;
    }

    .toggle-group {
        width: 100%;
    }

    .toggle-btn {
        flex: 1;
    }
}

/* Handsontable 自定义样式 */
.handsontable {
    font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

.handsontable th {
    background: var(--background-color) !important;
    font-weight: 600 !important;
}

.handsontable .htDimmed {
    color: var(--text-secondary);
}

.handsontable .htRight {
    text-align: right;
}

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

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

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

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

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

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    color: var(--border-color);
}

.empty-state p {
    font-size: 16px;
    margin-bottom: 20px;
}

/* 加载动画 */
.loading {
    display: flex;
    align-items: center;
    justify-content: 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); }
}