:root {
    --primary-color: #e74c3c;
    --secondary-color: #2c3e50;
    --accent-color: #3498db;
    --light-bg: #f9f9f9;
    --dark-text: #333;
    --light-text: #777;
    --border-color: #e0e0e0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

@font-face {
    font-family: 'LocalNotoSansSC';
    src: local('Noto Sans SC'), local('Microsoft YaHei'), local('PingFang SC'), local('Hiragino Sans GB');
}

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

body {
    font-family: 'LocalNotoSansSC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    background-color: #f5f5f5;
    color: var(--dark-text);
    line-height: 1.7;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    text-align: center;
    padding: 30px 0;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    margin-bottom: 20px;
    border-radius: 0 0 10px 10px;
    box-shadow: var(--shadow);
    user-select: none;
}

h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

nav {
    background-color: white;
    padding: 15px 0;
    margin-bottom: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
}

nav ul li {
    margin: 0 15px;
    position: relative;
}

nav ul li a {
    text-decoration: none;
    color: var(--secondary-color);
    font-size: 16px;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 20px;
    transition: var(--transition);
}

nav ul li a:hover,
nav ul li a.active {
    background-color: var(--primary-color);
    color: white;
}

@media (max-width: 768px) {
    nav ul {
        justify-content: center;
    }

    nav ul li {
        margin: 5px;
    }
}