/* 全局样式 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #27ae60;
    --accent-color: #e67e22;
    --background-color: #f9f9f9;
    --text-color: #333;
    --light-text: #fff;
    --border-color: #ddd;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s;
}

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

/* 布局容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.logo span {
    color: var(--secondary-color);
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: var(--light-text);
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 4px;
}

nav ul li a:hover, nav ul li a.active {
    background-color: var(--secondary-color);
    color: #fff;
}

/* 移动端菜单按钮（默认隐藏） */
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('https://images.unsplash.com/photo-1505751172876-fa1923c5c528?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    margin-bottom: 2rem;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: #fff;
    padding: 10px 25px;
    border-radius: 5px;
    font-weight: bold;
}

.btn:hover {
    background-color: #219150;
    color: #fff;
}

/* 内容板块 */
.section {
    padding: 3rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 10px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--secondary-color);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: transform 0.3s;
}

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

.card-content {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.card-text {
    color: #666;
    margin-bottom: 1rem;
}

.read-more {
    color: var(--secondary-color);
    font-weight: 600;
}

/* 信息盒子样式 */
.info-box {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-top: 2rem;
}

.info-box h3 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    display: inline-block;
}

.info-box ul {
    list-style: none;
}

.info-box li {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.info-box strong {
    color: var(--secondary-color);
}

/* 页脚 */
footer {
    background-color: var(--primary-color);
    color: #fff;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

footer p {
    opacity: 0.8;
}

/* Language Switcher */
.lang-switch {
    border: 1px solid rgba(255, 255, 255, 0.5);
    margin-left: 15px;
}

.lang-switch:hover {
    background-color: #fff;
    color: var(--primary-color) !important;
}

/* 响应式调整 */
@media (max-width: 768px) {
    nav ul {
        display: none; /* 这里可以配合JS做汉堡菜单，目前简单处理 */
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: var(--primary-color);
        padding: 1rem;
    }
    
    nav ul.show {
        display: flex;
    }

    nav ul li {
        margin: 10px 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-content h2 {
        font-size: 1.8rem;
    }
}