/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

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

/* 头部样式 */
header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

nav ul li a:hover {
    color: #667eea;
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: #667eea;
    transition: width 0.3s ease;
}

nav ul li a:hover::after {
    width: 100%;
}

.burger {
    display: none;
    cursor: pointer;
}

.burger div {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 5px;
    transition: all 0.3s ease;
}

/* 主要内容样式 */
main {
    margin-top: 80px;
}

section {
    padding: 60px 0;
}

.hero {
    text-align: center;
    padding: 100px 0;
    color: white;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.btn {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(5px);
}

.btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.categories h2, .contact h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2rem;
    color: white;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.site-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    text-decoration: none;
    color: #333;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.site-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.site-card img {
    width: 60px;
    height: 60px;
    object-fit: contain;
    margin-bottom: 15px;
    border-radius: 10px;
}

.site-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: #333;
}

.site-card p {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 0;
}

.contact {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    max-width: 800px;
    margin: 40px auto;
    text-align: center;
}

.contact h2 {
    color: #333;
    margin-bottom: 20px;
}

.contact p {
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: #555;
}

.contact ul {
    list-style: none;
    margin-top: 20px;
}

.contact ul li {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: #555;
}

/* 页脚样式 */
footer {
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    text-align: center;
    padding: 20px 0;
    margin-top: 50px;
}

/* 响应式设计 */
@media screen and (max-width: 1200px) {
    .category-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media screen and (max-width: 992px) {
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    body {
        padding: 0;
    }
    
    .container {
        max-width: 100%;
        padding: 0 15px;
    }
}

@media screen and (max-width: 768px) {
    header .container {
        flex-direction: row;
        padding: 15px;
    }

    .logo {
        margin-bottom: 0;
    }

    nav ul {
        margin: 0;
        padding: 0;
    }

    nav ul li {
        margin: 0 10px;
    }

    .burger {
        display: block;
    }

    .nav-links {
        position: absolute;
        right: 0px;
        height: calc(100vh - 80px);
        top: 80px;
        background: rgba(255, 255, 255, 0.95);
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
        transform: translateX(100%);
        transition: transform 0.5s ease-in;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        backdrop-filter: blur(10px);
    }

    .nav-links li {
        margin: 20px 0;
        opacity: 0;
    }

    .nav-active {
        transform: translateX(0%);
    }

    @keyframes navLinkFade {
        from {
            opacity: 0;
            transform: translateX(50px);
        }
        to {
            opacity: 1;
            transform: translateX(0px);
        }
    }

    .toggle .line1 {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .toggle .line2 {
        opacity: 0;
    }

    .toggle .line3 {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .hero {
        padding: 60px 0;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    section {
        padding: 40px 0;
    }

    .categories h2, .contact h2 {
        font-size: 1.8rem;
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .site-card {
        padding: 15px;
    }

    .site-card img {
        width: 50px;
        height: 50px;
    }

    .site-card h3 {
        font-size: 1rem;
    }

    .site-card p {
        font-size: 0.8rem;
    }

    .contact {
        padding: 30px 20px;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero h2 {
        font-size: 1.7rem;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }

    .site-card {
        padding: 20px 15px;
    }

    .site-card img {
        width: 60px;
        height: 60px;
    }

    .site-card h3 {
        font-size: 1.2rem;
    }
}