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

:root {
    --primary-color: #3370ff;
    --primary-hover: #295ac8;
    --bg-color: #f5f6f7;
    --card-bg: #ffffff;
    --text-primary: #1f2329;
    --text-secondary: #646a73;
    --border-color: #dee0e3;
    --success-color: #34a853;
    --danger-color: #ea4335;
    --warning-color: #f5a623;
    --income-color: #34a853;
    --expense-color: #ea4335;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 40px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

header h1 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background 0.2s;
}

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

.panel {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.panel.hidden {
    display: none;
}

/* 错误面板 */
.error-panel {
    text-align: center;
    padding: 48px 24px;
}

.error-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.error-panel h2 {
    margin-bottom: 12px;
}

.error-panel p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* 按钮样式 */
.primary-btn,
.secondary-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s;
}

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

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

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

.secondary-btn:hover {
    background: #c8cdd4;
}

/* 加载动画 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
    color: white;
    margin-top: 16px;
    font-size: 1.1rem;
}

/* 月份选择器 */
.month-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.current-month {
    flex: 1;
    text-align: center;
    padding: 12px;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-radius: 8px;
}

.month-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.month-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-btn {
    padding: 12px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.2s;
    white-space: nowrap;
}

.nav-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.nav-btn:disabled {
    background: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.5;
}

.month-selector label {
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.month-selector select {
    flex: 1;
    min-width: 150px;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}
.summary-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.summary-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    border-radius: 12px;
    background: var(--bg-color);
}

.summary-card.income {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
}

.summary-card.expense {
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
}

.summary-card.balance {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
}

.summary-icon {
    font-size: 2rem;
}

.summary-content {
    flex: 1;
}

.summary-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.summary-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.summary-card.income .summary-value {
    color: var(--income-color);
}

.summary-card.expense .summary-value {
    color: var(--expense-color);
}

/* 明细列表 */
.details-section {
    margin-top: 24px;
}

.details-section.hidden {
    display: none;
}

.section-title {
    font-size: 1.1rem;
    margin-bottom: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-title.income-title {
    background: #e8f5e9;
    color: var(--income-color);
}

.section-title.expense-title {
    background: #ffebee;
    color: var(--expense-color);
    margin-top: 24px;
}

.item-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.item-card {
    background: var(--bg-color);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s;
}

.item-card:hover {
    transform: translateX(4px);
}

.item-card.income {
    border-left: 4px solid var(--income-color);
}

.item-card.expense {
    border-left: 4px solid var(--expense-color);
}

.item-info {
    flex: 1;
}

.item-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.item-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.item-amount {
    font-weight: 600;
    font-size: 1.1rem;
}

.item-card.income .item-amount {
    color: var(--income-color);
}

.item-card.expense .item-amount {
    color: var(--expense-color);
}

/* 无数据提示 */
.no-data-tip {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.no-data-tip.hidden {
    display: none;
}

.no-data-tip p {
    font-size: 1.1rem;
}

/* Tab 切换样式 */
.tab-container {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    background: var(--bg-color);
    padding: 6px;
    border-radius: 10px;
}

.tab-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: rgba(51, 112, 255, 0.1);
    color: var(--primary-color);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 6px rgba(51, 112, 255, 0.3);
}

/* 视图面板 */
.view-panel {
    animation: fadeIn 0.3s ease;
}

.view-panel.hidden {
    display: none;
}

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

/* 年份选择器 */
.year-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.year-selector label {
    font-weight: 500;
    color: var(--text-secondary);
}

.year-selector select {
    flex: 1;
    min-width: 150px;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

/* 最近12个月表格 */
.months12-table-container {
    overflow-x: auto;
    border-radius: 12px;
    background: var(--card-bg);
}

.months12-table {
    width: 100%;
    border-collapse: collapse;
}

.months12-table thead {
    background: var(--bg-color);
}

.months12-table th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
}

.months12-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.months12-table tbody tr:last-child td {
    border-bottom: none;
}

.months12-table tbody tr:hover {
    background: var(--bg-color);
}

.months12-table .income-cell {
    color: var(--income-color);
    font-weight: 500;
}

.months12-table .expense-cell {
    color: var(--expense-color);
    font-weight: 500;
}

.months12-table .balance-positive {
    color: var(--income-color);
    font-weight: 600;
}

.months12-table .balance-negative {
    color: var(--expense-color);
    font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    header h1 {
        font-size: 1.2rem;
    }

    .panel {
        padding: 16px;
    }

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

    .summary-section {
        grid-template-columns: 1fr;
    }

    .item-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .item-amount {
        align-self: flex-end;
    }
}