:root {
    /* 亮色主题变量 */
    --bg-color: #f5f7fa;
    --panel-bg: #ffffff;
    --text-main: #2c3e50;
    --text-muted: #7f8c8d;
    --border-color: #e2e8f0;
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
    --danger-color: #e74c3c;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --input-bg: #f8fafc;
}

[data-theme="dark"] {
    /* 暗色主题变量 */
    --bg-color: #1a202c;
    --panel-bg: #2d3748;
    --text-main: #f7fafc;
    --text-muted: #a0aec0;
    --border-color: #4a5568;
    --primary-color: #4299e1;
    --primary-hover: #3182ce;
    --success-color: #48bb78;
    --warning-color: #ecc94b;
    --danger-color: #f56565;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.4);
    --input-bg: #1a202c;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
    min-width: 320px;
    overflow-x: hidden;
}
/* 布局样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 20px;
    background-color: var(--panel-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 24px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.summary-banner {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 15px 20px;
    border-radius: var(--radius);
    font-size: 18px;
    font-weight: 600;
    text-align: center;
    box-shadow: var(--shadow);
    margin-bottom: 10px;
}

.summary-banner span {
    color: #f1c40f;
    font-size: 22px;
}

/* 输入面板样式 */
.panel {
    background-color: var(--panel-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

.input-group {
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.input-group-header {
    background-color: rgba(0,0,0,0.03);
    padding: 12px 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.input-group-content {
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-control {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-control label {
    font-size: 14px;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.form-control input {
    width: 100%;
    padding: 8px 55px 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-main);
    font-size: 14px;
    outline: none;
}

.form-control input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.input-suffix {
    position: absolute;
    right: 10px;
    color: var(--text-muted);
    font-size: 14px;
    pointer-events: none;
}

.form-control input[type="range"] {
    padding: 0;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    appearance: none;
    margin-top: 10px;
}

.form-control input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.range-value {
    font-weight: bold;
    color: var(--primary-color);
}

/* 提示图标 */
.info-icon {
    color: var(--primary-color);
    cursor: help;
    position: relative;
    margin-left: 5px;
    font-size: 12px;
}

/* tooltip 由 JS 动态创建，不再使用 ::after 伪元素 */

.global-tooltip {
    position: fixed;
    background-color: #333;
    color: white;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 12px;
    z-index: 99999;
    pointer-events: none;
    max-width: 260px;
    white-space: normal;
    word-wrap: break-word;
    line-height: 1.5;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    opacity: 0;
    transition: opacity 0.15s;
}

.global-tooltip.visible {
    opacity: 1;
}

/* 按钮样式 */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

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

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: rgba(0,0,0,0.05);
}

.scenario-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.scenario-btn {
    flex: 1;
    padding: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    background-color: var(--panel-bg);
    color: var(--text-main);
}

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

/* 右侧结果区域样式 */
.results-area {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* KPI 卡片网格 */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

/* 模态框样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

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

.modal-content {
    background-color: var(--panel-bg);
    width: 90%;
    max-width: 800px;
    max-height: 85vh;
    border-radius: var(--radius);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    display: flex;
    flex-direction: column;
    transform: translateY(20px);
    transition: transform 0.3s;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

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

.modal-header h2 {
    font-size: 20px;
    color: var(--primary-color);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
}

.term-item {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--border-color);
}

.term-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.term-title {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-main);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.term-formula {
    background-color: var(--input-bg);
    padding: 10px;
    border-radius: 4px;
    font-family: monospace;
    color: var(--primary-color);
    margin-bottom: 10px;
    border-left: 3px solid var(--primary-color);
}

.term-desc {
    color: var(--text-muted);
    line-height: 1.6;
}

.term-example {
    margin-top: 10px;
    padding: 10px;
    background-color: rgba(46, 204, 113, 0.1);
    border-radius: 4px;
    font-size: 14px;
    color: var(--text-main);
}

.kpi-card {
    background-color: var(--panel-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--primary-color);
}

.kpi-card.highlight::before {
    background-color: var(--warning-color);
}

.kpi-card.success::before {
    background-color: var(--success-color);
}

.kpi-title {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.kpi-value {
    font-size: 28px;
    font-weight: bold;
    color: var(--text-main);
}

.kpi-value.highlight-text {
    color: var(--warning-color);
}

.kpi-value.success-text {
    color: var(--success-color);
}

.kpi-subtext {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 5px;
}

/* 图表容器网格 */
.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.chart-container {
    background-color: var(--panel-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
}

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

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.chart-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
}

.chart-body {
    position: relative;
    height: 300px;
    width: 100%;
}

/* 敏感性分析表格样式 */
.sensitivity-table-container {
    overflow-x: auto;
}

.sensitivity-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    text-align: center;
}

.sensitivity-table th, .sensitivity-table td {
    padding: 10px;
    border: 1px solid var(--border-color);
}

.sensitivity-table th {
    background-color: rgba(0,0,0,0.03);
    font-weight: 600;
}

.sensitivity-table td {
    font-weight: bold;
}

/* 杠杆对比卡片 */
.leverage-comparison {
    display: flex;
    gap: 20px;
    margin-top: 15px;
}

.leverage-card {
    flex: 1;
    padding: 15px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    text-align: center;
}

.leverage-card h4 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.leverage-card .val {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.leverage-card.active {
    background-color: rgba(52, 152, 219, 0.05);
    border-color: var(--primary-color);
}

/* 响应式布局 */
@media (max-width: 1024px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .kpi-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .leverage-comparison {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .kpi-grid {
        grid-template-columns: 1fr;
    }
    
    .scenario-buttons {
        flex-direction: column;
    }
    
    .input-group-content {
        padding: 10px;
        gap: 10px;
    }
    
    /* 人力成本网格在小屏幕变为两列 */
    div[style*="grid-template-columns:auto 60px 100px"] {
        grid-template-columns: auto 50px 85px !important;
        gap: 5px !important;
    }
    
    div[style*="grid-template-columns:auto 60px 100px"] input {
        width: 100% !important;
        font-size: 13px;
    }
    
    .leverage-comparison {
        flex-direction: column;
    }
    
    .kpi-value {
        font-size: 22px;
    }
    
    .chart-body {
        height: 220px;
    }
}

@media (max-width: 600px) {
    .sensitivity-table {
        font-size: 11px;
    }
    
    .sensitivity-table th, .sensitivity-table td {
        padding: 5px 4px;
    }
    
    .header {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 18px;
    }
    
    body {
        padding: 10px;
    }
    
    .summary-banner {
        font-size: 14px;
    }
    
    .summary-banner span {
        font-size: 16px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

/* 月度现金流折叠区域 */
.monthly-flow-section {
    overflow: hidden;
}

.monthly-flow-toggle {
    user-select: none;
}

.monthly-flow-toggle:hover {
    background-color: rgba(0,0,0,0.05);
}

.monthly-flow-arrow {
    font-size: 14px;
    color: var(--text-muted);
    transition: transform 0.3s;
    display: inline-block;
}

.monthly-flow-arrow.expanded {
    transform: rotate(90deg);
}

.monthly-flow-content {
    padding: 15px;
    border-top: 1px solid var(--border-color);
}

.monthly-multiplier-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
}

.monthly-input-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.monthly-input-cell label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 600;
}

.monthly-input-cell input {
    width: 100%;
    padding: 6px 4px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-main);
    font-size: 13px;
    text-align: center;
    outline: none;
    box-sizing: border-box;
}

.monthly-input-cell input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

@media (max-width: 768px) {
    .monthly-multiplier-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 480px) {
    .monthly-multiplier-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 隐藏/显示控制 */
.hidden {
    display: none !important;
}

.collapsed .input-group-content {
    display: none;
}

.collapsed .input-group-header i.fa-chevron-up {
    transform: rotate(180deg);
}

.input-group-header i {
    transition: transform 0.3s;
}

/* 打印样式 */
@media print {
    body {
        background-color: white;
        padding: 0;
    }
    
    .container {
        display: block;
    }
    
    .panel {
        display: none; /* 打印时隐藏输入面板 */
    }
    
    .header .btn {
        display: none; /* 打印时隐藏按钮 */
    }
    
    .results-area {
        width: 100%;
    }
    
    .chart-container {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
        margin-bottom: 20px;
    }
    
    .kpi-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}