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

/* 基础样式 */
:root {
    --primary-color: #2c5aa0;
    --secondary-color: #87ceeb;
    --accent-color: #4a90e2;
    --text-dark: #333;
    --text-light: #666;
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 30px rgba(0,0,0,0.2);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --max-width: 1200px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

/* 通用容器 */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-light);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger .bar {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: var(--transition);
}

.hamburger.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 主视频区域 */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(44, 90, 160, 0.7), rgba(135, 206, 235, 0.5));
    z-index: -1;
}

.hero-content {
    text-align: center;
    color: var(--white);
    z-index: 1;
    max-width: 600px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 15px;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.8;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.cta-button {
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    border: none;
    padding: 15px 35px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    animation: fadeInUp 1s ease-out 0.6s both;
    box-shadow: var(--shadow-medium);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
    background: linear-gradient(45deg, var(--accent-color), var(--primary-color));
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--white);
    border-bottom: 2px solid var(--white);
    transform: rotate(45deg);
}

/* 通用样式 */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.section-divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    margin: 0 auto 20px;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* 关于我们部分 */
.about {
    background: var(--light-gray);
}

.about-text h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-align: center;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-light);
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-item {
    background: var(--white);
    padding: 40px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-item h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.feature-item p {
    color: var(--text-light);
    font-size: 1rem;
}

/* 产品展示 */
.products {
    background: var(--white);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.product-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.product-card.featured {
    border: 3px solid var(--accent-color);
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: linear-gradient(45deg, #ff6b6b, #ff8e53);
    color: var(--white);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    z-index: 2;
}

.product-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

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

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-info {
    padding: 30px;
    text-align: center;
}

.product-info h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.product-info p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.product-specs {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.product-specs span {
    background: var(--light-gray);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-dark);
    font-weight: 500;
}

/* 品牌文化 */
.culture {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.culture-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -2;
}

.culture-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.culture-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(44, 90, 160, 0.8), rgba(135, 206, 235, 0.6));
    z-index: -1;
}

.culture-content {
    text-align: center;
    color: var(--white);
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.culture-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
}

.culture-text {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 50px;
    opacity: 0.9;
}

.culture-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.value-item {
    text-align: center;
}

.value-item h4 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.value-item p {
    opacity: 0.8;
    font-size: 1rem;
}

/* 联系我们 */
.contact {
    background: var(--light-gray);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    text-align: center;
}

.contact-item h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.contact-item p {
    font-size: 1.1rem;
    color: var(--text-light);
}

.qr-code {
    margin-top: 15px;
}

.qr-code img {
    width: 120px;
    height: 120px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

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

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.footer-brand p {
    opacity: 0.8;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--secondary-color);
}

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

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
    box-shadow: var(--shadow-medium);
}

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

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) translateX(-50%);
    }
    40% {
        transform: translateY(-10px) translateX(-50%);
    }
    60% {
        transform: translateY(-5px) translateX(-50%);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 导航栏 */
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 50px;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-medium);
    }

    .nav-menu.active {
        left: 0;
    }

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

    .hamburger {
        display: flex;
    }

    /* 主标题 */
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    /* 通用 */
    .section-title {
        font-size: 2rem;
    }

    .container {
        padding: 0 15px;
    }

    /* 特性网格 */
    .features {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* 产品网格 */
    .products-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    /* 文化价值 */
    .culture-values {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .culture-title {
        font-size: 2rem;
    }

    .culture-text {
        font-size: 1.1rem;
    }

    /* 联系信息 */
    .contact-info {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    /* 页脚 */
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

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

    .hero-description {
        font-size: 0.9rem;
    }

    .cta-button {
        padding: 12px 25px;
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .culture-title {
        font-size: 1.8rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}

/* AOS动画样式增强 */
[data-aos] {
    pointer-events: none;
}

[data-aos].aos-animate {
    pointer-events: auto;
}