:root {
    --header-bg: #2c3e50;
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-color: #3498db;
    --border-color: #e0e0e0;
    --content-bg: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f8f9fa;
    color: var(--text-primary);
    line-height: 1.6;
}

/* 统一宽度容器 */
.container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles - 现在标题栏宽度与内容相同 */
header {
    background-color: var(--header-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    /* 标题栏宽度与内容区域相同 */
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 25px 0;
}

.site-title {
    font-size: 36px;
    font-weight: 700;
    color: white;
    margin-bottom: 8px;
    text-align: center;
}

.site-tagline {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 25px;
    text-align: center;
    font-weight: 400;
}

/* Navigation */
nav {
    width: 100%;
}

.nav-links {
    display: flex;
    justify-content: center;
    list-style: none;
    flex-wrap: wrap;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 12px 0;
}

.nav-links li {
    margin: 0 15px;
}

.nav-links a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s;
    padding: 5px 0;
    position: relative;
}

.nav-links a:hover {
    color: rgba(255, 255, 255, 0.8);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: white;
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 5px;
}

/* Main Content */
main {
    background-color: var(--content-bg);
    padding: 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
    /* 确保内容区域与标题栏宽度相同 */
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

h1 {
    font-size: 32px;
    margin-bottom: 15px;
    color: var(--text-primary);
    font-weight: 700;
}

h2 {
    font-size: 24px;
    margin: 30px 0 15px;
    color: var(--text-primary);
    font-weight: 600;
}

h3 {
    font-size: 20px;
    margin: 25px 0 10px;
    color: var(--text-primary);
    font-weight: 600;
}

p {
    margin-bottom: 15px;
    color: var(--text-primary);
}

ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

li {
    margin-bottom: 8px;
    color: var(--text-primary);
}

.last-modified {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 16px;
}

strong {
    font-weight: 600;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    font-size: 14px;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
    /* 确保页脚宽度与内容相同 */
    width: 100%;
    max-width: 1000px;
    margin: 40px auto 0;
    padding: 30px 20px;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .header-content {
        padding: 20px 0;
    }
    
    .site-title {
        font-size: 28px;
    }
    
    .site-tagline {
        font-size: 16px;
    }
    
    .mobile-menu-btn {
        display: block;
        position: absolute;
        top: 20px;
        right: 20px;
    }
    
    .nav-links {
        display: none;
        flex-direction: column;
        align-items: center;
        border: none;
        padding: 0;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links li {
        margin: 10px 0;
        width: 100%;
        text-align: center;
    }
    
    .nav-links a {
        display: block;
        padding: 12px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-links a:last-child {
        border-bottom: none;
    }
    
    main {
        padding: 25px 20px;
    }
    
    h1 {
        font-size: 26px;
    }
    
    h2 {
        font-size: 22px;
    }
    
    h3 {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 15px 0;
    }
    
    .site-title {
        font-size: 24px;
    }
    
    .site-tagline {
        font-size: 15px;
    }
    
    main {
        padding: 20px 15px;
    }
    
    h1 {
        font-size: 22px;
    }
    
    h2 {
        font-size: 20px;
    }
}