:root {
    --primary-color: #1677ff;
    --primary-light: #e6f4ff;
    --text-color: #333;
    --border-color: #ddd;
    --background-color: #f5f5f5;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: var(--background-color);
    padding: 20px;
    line-height: 1.6;
    color: var(--text-color);
}

.calculator {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 24px;
}

header {
    text-align: center;
    margin-bottom: 24px;
}

h1 {
    color: var(--text-color);
    font-size: 24px;
    margin-bottom: 8px;
}

.data-info {
    color: #666;
    font-size: 14px;
}

.main-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    background: var(--primary-light);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 24px;
}

.input-group {
    margin-bottom: 16px;
}

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

.input-group input,
.input-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: all 0.3s;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(22,119,255,0.1);
}

.settings-panel {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 24px;
}

.settings-panel h3 {
    color: var(--text-color);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.settings-section {
    background: var(--background-color);
    border-radius: 8px;
    padding: 16px;
}

.settings-section h4 {
    color: var(--primary-color);
    margin-bottom: 16px;
}

#diningRatioContainer {
    margin-top: 12px;
}

input[type="range"] {
    width: 100%;
    margin: 8px 0;
}

.city-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.city-card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s ease;
}

.city-card:hover {
    transform: translateY(-2px);
}

.source-city {
    border: 2px solid var(--primary-color);
}

.city-card h4 {
    color: var(--primary-color);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.cost-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 14px;
}

.cost-item .label {
    color: #666;
}

.total-cost {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-weight: bold;
    font-size: 16px;
}

.required-salary {
    margin-top: 16px;
    padding: 12px;
    background: var(--primary-light);
    border-radius: 6px;
    text-align: center;
    color: var(--primary-color);
    font-weight: bold;
}

.comparison-ratio {
    font-size: 14px;
    color: #666;
    text-align: center;
    margin-top: 8px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .calculator {
        padding: 16px;
    }

    .main-inputs {
        grid-template-columns: 1fr;
    }

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

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

/* 滑块样式优化 */
input[type="range"] {
    -webkit-appearance: none;
    height: 4px;
    background: #ddd;
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

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

.city-card {
    animation: fadeIn 0.3s ease-out;
}

/* 工具提示样式 */
.tooltip {
    position: relative;
    display: inline-block;
    margin-left: 4px;
    cursor: help;
}

.tooltip:hover::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 10px;
    background: #333;
    color: white;
    font-size: 12px;
    border-radius: 4px;
    white-space: nowrap;
    z-index: 1;
}

/* 加载状态样式 */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '计算中...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
}

.source-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    padding: 8px;
    margin: 8px auto 0;
    font-size: 13px;
    color: #888;
}

.source-links a {
    color: #666;
    text-decoration: none;
    transition: color 0.2s ease;
}

.source-links a:hover {
    color: #1677ff;
}

.github-link {
    display: flex;
    align-items: center;
    gap: 4px;
}

.github-icon {
    display: inline-block;
    vertical-align: middle;
}

.separator {
    width: 1px;
    height: 12px;
    background-color: #ddd;
}

.data-source {
    color: #888;
}

.update-time {
    color: #999;
    margin-left: 2px;
    font-size: 12px;
}