/* 天青色渐变主题样式 */
:root {
    --primary-color: #87CEEB;
    --secondary-color: #4682B4;
    --accent-color: #00CED1;
    --light-color: #E0F2F1;
    --dark-color: #006666;
    --gradient-start: #E0F7FA;
    --gradient-mid: #87CEEB;
    --gradient-end: #4682B4;
    --text-dark: #333333;
    --text-light: #FFFFFF;
    --shadow-color: rgba(70, 130, 180, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(135,206,235,0.3) 100%);
    border-radius: 0 0 30px 30px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px var(--shadow-color);
}

.title {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--secondary-color);
    font-weight: 300;
}

/* 导航样式 */
.navigation {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 1.5rem;
    margin-bottom: 3rem;
    box-shadow: 0 8px 32px var(--shadow-color);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.nav-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    list-style: none;
}

.nav-item {
    margin: 0;
}

.nav-link {
    display: block;
    padding: 0.8rem 1.5rem;
    background: linear-gradient(135deg, var(--light-color), var(--primary-color));
    color: var(--secondary-color);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    transition: left 0.3s ease;
    z-index: -1;
}

.nav-link:hover::before {
    left: 0;
}

.nav-link:hover {
    color: var(--text-light);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: var(--text-light);
    box-shadow: 0 5px 20px var(--shadow-color);
}

/* 主要内容样式 */
.main-content {
    margin-bottom: 3rem;
}

.chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(600px, 1fr));
    gap: 2rem;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chart-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 40px var(--shadow-color);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.chart-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px var(--shadow-color);
}

.chart-header {
    margin-bottom: 1.5rem;
}

.chart-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.chart-description {
    color: var(--text-dark);
    opacity: 0.8;
    font-size: 0.95rem;
}

.chart-container {
    background: linear-gradient(135deg, rgba(255,255,255,0.8) 0%, rgba(224,247,250,0.6) 100%);
    border-radius: 15px;
    padding: 1.5rem;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(135, 206, 235, 0.2);
}

.chart-container div {
    width: 100%;
    height: 400px;
}

/* 页脚样式 */
.footer {
    text-align: center;
    padding: 2rem 0;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 30px 30px 0 0;
    margin-top: 3rem;
    box-shadow: 0 -10px 30px var(--shadow-color);
    color: var(--secondary-color);
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .nav-list {
        justify-content: center;
    }
    
    .nav-link {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
    
    .chart-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .chart-section {
        padding: 1.5rem;
    }
    
    .chart-container div {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.5rem;
    }
    
    .nav-link {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .chart-section {
        padding: 1rem;
    }
    
    .chart-container {
        padding: 1rem;
        min-height: 300px;
    }
    
    .chart-container div {
        height: 250px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gradient-start);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(var(--secondary-color), var(--accent-color));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(var(--accent-color), var(--dark-color));
}

/* 加载动画 */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 400px;
}

.loading::after {
    content: '';
    width: 40px;
    height: 40px;
    border: 4px solid var(--light-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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