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

/* 根变量定义 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --bg-light: #f5f7fa;
    --bg-dark: #1a1a1a;
    --text-light: #ffffff;
    --text-dark: #333333;
    --text-muted: #666666;
    --transition: all 0.3s ease;
}

/* 基础样式 */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    scroll-behavior: smooth;
}

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

/* 导航栏样式 */
nav {
    background-color: rgba(44, 62, 80, 0.95);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    padding: 15px 0;
}

/* 导航栏容器flex布局 */
nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: nowrap;
}

.logo a {
    color: var(--text-light);
    font-size: 2rem;
    font-weight: 700;
    text-decoration: none;
    display: block;
    white-space: nowrap;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
    white-space: nowrap;
}

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
    padding: 10px 15px;
    font-size: 0.95rem;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

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

.nav-links a.active {
    color: var(--secondary-color);
}

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

.nav-scrolled {
    background-color: var(--primary-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: var(--transition);
    background-color: var(--text-light);
}

/* 英雄区域样式 */
.hero {
    height: 100vh;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://via.placeholder.com/1920x1080?text=NOVA+背景');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-light);
}

.hero-content h1 {
    font-size: 4.5rem;
    margin-bottom: 20px;
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: 2px;
}

.hero-content h1 span {
    color: var(--secondary-color);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 800px;
    letter-spacing: 1px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--secondary-color);
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--secondary-color);
}

.btn:hover {
    background-color: transparent;
    color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.hero-btn {
    background-color: transparent;
    color: var(--secondary-color);
    padding: 15px 40px;
    font-size: 1.1rem;
    border: 2px solid var(--secondary-color);
}

.hero-btn:hover {
    background-color: var(--secondary-color);
    color: var(--text-light);
}

/* 通用section样式 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
    letter-spacing: 1px;
}

.section-header h2::after {
    content: '';
    position: absolute;
    width: 100px;
    height: 3px;
    background-color: var(--secondary-color);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* 品牌理念样式 */
.about {
    background-color: var(--bg-light);
}

.about-content {
    display: flex;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
}

.about-text,
.about-image {
    flex: 1;
    min-width: 300px;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.about-image:hover img {
    transform: scale(1.02);
}

/* 产品系列样式 */
.products {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.products .section-header h2 {
    color: var(--text-light);
}

.products .section-header h2::after {
    background-color: var(--secondary-color);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.product-item {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.product-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    background-color: rgba(255, 255, 255, 0.08);
}

.product-image {
    height: 350px;
    overflow: hidden;
    position: relative;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-item:hover .product-image img {
    transform: scale(1.05);
}

.product-info {
    padding: 20px;
}

.product-info h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--secondary-color);
    letter-spacing: 1px;
}

.product-info p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 15px;
}

.product-details {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

/* 产品特色样式 */
.features {
    background-color: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 30px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-item:hover::before {
    width: 100%;
    opacity: 0.1;
}

.feature-icon {
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--text-light);
    font-size: 2rem;
    transition: var(--transition);
    z-index: 1;
    position: relative;
}

.feature-item:hover .feature-icon {
    background-color: var(--secondary-color);
    transform: scale(1.1);
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    position: relative;
    z-index: 1;
}

.feature-item p {
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

/* 精湛工艺样式 */
.craft {
    background-color: var(--secondary-color);
    color: var(--text-light);
    position: relative;
    overflow: hidden;
}

.craft::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://via.placeholder.com/1920x1080?text=纹理背景');
    background-size: cover;
    background-position: center;
    opacity: 0.1;
    z-index: 0;
}

.craft .container {
    position: relative;
    z-index: 1;
}

.craft .section-header h2 {
    color: var(--text-light);
}

.craft .section-header h2::after {
    background-color: var(--text-light);
}

.craft-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.craft-item {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.craft-item:hover {
    transform: translateY(-10px);
    background-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.craft-number {
    font-size: 3rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.2);
    position: absolute;
    top: 10px;
    right: 20px;
    line-height: 1;
}

.craft-item h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
}

.craft-item p {
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    z-index: 1;
}

/* 品牌资讯样式 */
.news {
    background-color: var(--bg-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.news-item {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.news-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.news-image {
    height: 200px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.news-item:hover .news-image img {
    transform: scale(1.05);
}

.news-content {
    padding: 20px;
}

.news-date {
    display: inline-block;
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.news-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

.news-item:hover .news-content h3 {
    color: var(--secondary-color);
}

.news-content p {
    color: var(--text-muted);
}

/* 页脚样式 */
.footer {
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding: 50px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-brand h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--secondary-color);
    letter-spacing: 1px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--text-light);
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

/* 友情链接样式 */
.friend-links h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-light);
}

.links-row {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.friend-link {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: var(--transition);
    white-space: nowrap;
    padding: 5px 10px;
    border-radius: 5px;
}

.friend-link:hover {
    color: var(--secondary-color);
    background-color: rgba(255, 255, 255, 0.05);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.warning {
    font-size: 0.8rem;
    margin-top: 10px;
    color: var(--accent-color);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--secondary-color);
    color: var(--text-light);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 99;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-color);
    transform: translateY(-5px);
}

/* 响应式设计 - 992px */
@media (max-width: 992px) {
    .hero-content h1 {
        font-size: 3.5rem;
    }
    
    .about-content,
    .features-grid,
    .craft-grid,
    .news-grid {
        gap: 20px;
    }
    
    .feature-icon {
        width: 70px;
        height: 70px;
        font-size: 1.8rem;
    }
}

/* 响应式设计 - 768px */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .nav-links {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--primary-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links a {
        margin: 1rem 0;
        width: 100%;
    }
    
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    section {
        padding: 80px 0;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .links-row {
        justify-content: center;
    }
}

/* 响应式设计 - 576px */
@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .section-header p {
        font-size: 1rem;
    }
    
    .product-grid,
    .features-grid,
    .craft-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
        font-size: 1rem;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s ease forwards;
}

/* 滚动动画元素 */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}