/* 浅蓝+原木色+薄荷绿主题样式 */
:root {
    --primary-blue: #E3F2FD;          /* 浅蓝色背景 */
    --medium-blue: #90CAF9;           /* 中等蓝色 */
    --dark-blue: #1976D2;             /* 深蓝色 */
    --light-wood: #F5E6D3;            /* 原木色 - 浅木纹色 */
    --medium-wood: #D4A574;           /* 原木色 - 中等木纹色 */
    --dark-wood: #8B6914;             /* 原木色 - 深木纹色 */
    --mint-green: #98FB98;            /* 薄荷绿 */
    --light-mint: #E0F2F1;            /* 浅薄荷绿 */
    --dark-mint: #00897B;             /* 深薄荷绿 */
    --accent-color: #4DB6AC;          /* 强调色 */
    --text-primary: #37474F;          /* 主要文字色 */
    --text-secondary: #607D8B;        /* 次要文字色 */
    --shadow-light: rgba(158, 158, 158, 0.15);
    --shadow-medium: rgba(158, 158, 158, 0.2);
    --border-radius: 12px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-mint) 100%);
    min-height: 100vh;
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(90deg, var(--mint-green) 0%, var(--medium-blue) 100%);
    padding: 1rem 0;
    box-shadow: 0 2px 10px var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(245, 246, 250, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-title {
    font-size: 1.8rem;
    font-weight: bold;
    background: linear-gradient(45deg, var(--dark-blue), var(--dark-mint));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-links a:hover {
    background: var(--light-mint);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-medium);
}

/* 主容器样式 */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* 标题样式 */
h1 {
    text-align: center;
    color: var(--dark-blue);
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px var(--shadow-light);
}

h2 {
    color: var(--dark-mint);
    font-size: 1.8rem;
    margin: 2rem 0 1rem 0;
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
}

h3 {
    color: var(--dark-wood);
    font-size: 1.4rem;
    margin: 1.5rem 0 0.5rem 0;
}

/* 卡片样式 */
.card {
    background: linear-gradient(135deg, var(--light-wood) 0%, #FFF8E1 100%);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: 0 8px 32px var(--shadow-light);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--shadow-medium);
}

/* 图表容器样式 */
.chart-container {
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1rem 0;
    box-shadow: 0 4px 16px var(--shadow-light);
    border: 1px solid var(--light-mint);
    position: relative;
    height: 400px;
}

/* 控制面板样式 */
.controls {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-mint) 100%);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: 0 4px 16px var(--shadow-light);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.control-group {
    margin: 1rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.control-group label {
    font-weight: 600;
    color: var(--dark-blue);
    min-width: 120px;
}

.control-group select,
.control-group input {
    padding: 0.5rem 1rem;
    border: 2px solid var(--medium-blue);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.control-group select:focus,
.control-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(77, 182, 172, 0.2);
}

/* 按钮样式 */
.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    margin: 0.5rem;
}

.btn-primary {
    background: linear-gradient(45deg, var(--dark-blue), var(--medium-blue));
    color: white;
    box-shadow: 0 4px 15px rgba(25, 118, 210, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(25, 118, 210, 0.4);
}

.btn-secondary {
    background: linear-gradient(45deg, var(--dark-mint), var(--accent-color));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 137, 123, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 137, 123, 0.4);
}

.btn-wood {
    background: linear-gradient(45deg, var(--dark-wood), var(--medium-wood));
    color: white;
    box-shadow: 0 4px 15px rgba(139, 105, 20, 0.3);
}

.btn-wood:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 105, 20, 0.4);
}

/* 统计信息样式 */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background: linear-gradient(135deg, var(--medium-blue) 0%, var(--accent-color) 100%);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    color: white;
    box-shadow: 0 6px 20px var(--shadow-light);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* 表格样式 */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 16px var(--shadow-light);
}

.data-table th {
    background: linear-gradient(45deg, var(--dark-blue), var(--medium-blue));
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.data-table td {
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--light-mint);
}

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

/* 标签页样式 */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--medium-blue);
    margin: 2rem 0;
}

.tab {
    padding: 1rem 2rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.tab.active {
    color: var(--dark-blue);
    border-bottom-color: var(--accent-color);
    background: var(--light-mint);
}

.tab:hover {
    color: var(--dark-blue);
    background: var(--primary-blue);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .control-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .chart-container {
        height: 300px;
    }
}

/* 页脚样式 */
footer {
    background: linear-gradient(45deg, var(--dark-wood), var(--medium-wood));
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--light-mint);
    border-top: 3px solid var(--dark-mint);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 工具提示样式 */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--dark-wood);
    color: white;
    text-align: center;
    border-radius: 6px;
    padding: 0.5rem;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}