/* 现代化主页样式 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;700&family=Inter:wght@300;400;500;600;700&display=swap');

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

body {
    font-family: 'Inter', 'Noto Serif SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
    background-size: 300% 300%;
    animation: gradientBG 15s ease infinite;
}

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

/* 动画关键帧 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
    100% {
        transform: translateY(0px);
    }
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #4e54c8;
}

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

.nav-links li {
    margin-left: 25px;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 10px;
    border-radius: 4px;
}

.nav-links a:hover,
.nav-links a.active {
    color: #4e54c8;
    background-color: #f0f0f0;
}

.nav-links a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: -1;
}

.nav-links a:hover::before {
    transform: translateX(0);
}

/* 主要内容区域 */
main {
    min-height: calc(100vh - 140px);
    display: flex;
    align-items: center;
    padding: 50px 0;
}

.content-section {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 50px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.18);
    width: 100%;
    animation: fadeInUp 1s ease-out;
}

.content-section h2 {
    font-size: 42px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.content-section p {
    font-size: 18px;
    text-align: center;
    margin-bottom: 40px;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 首页特色内容 */
.featured-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.featured-item {
    background: rgba(255, 255, 255, 0.25);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
    transform: translateY(0);
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
}

.featured-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.35);
    box-shadow: 0 12px 40px rgba(31, 38, 135, 0.3);
}

.featured-item h3 {
    color: #fff;
    font-size: 24px;
    margin-bottom: 15px;
    position: relative;
    padding-bottom: 10px;
}

.featured-item h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 3px;
}

.featured-item p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 16px;
    margin-bottom: 0;
    text-align: left;
}

/* 页脚样式 */
footer {
    background: rgba(0, 0, 0, 0.2);
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    padding: 20px 0;
    margin-top: auto;
    backdrop-filter: blur(5px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        padding: 10px 0;
    }
    
    .logo {
        margin-bottom: 15px;
        font-size: 24px;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-links li {
        margin: 5px 10px;
    }
    
    .content-section {
        padding: 30px 20px;
    }
    
    .content-section h2 {
        font-size: 28px;
    }
    
    .content-section p {
        font-size: 16px;
    }
    
    .featured-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    main {
        padding: 20px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .content-section {
        padding: 20px 15px;
    }
    
    .content-section h2 {
        font-size: 24px;
    }
    
    .featured-item {
        padding: 20px;
    }
    
    .nav-links li {
        margin: 3px 5px;
    }
    
    .nav-links a {
        padding: 6px 12px;
        font-size: 14px;
    }
}