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

:root {
    --primary-color: #1a1a2e;
    --secondary-color: #0f3460;
    --accent-color: #e94560;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --text-color: #2d3748;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-gradient: linear-gradient(180deg, #ffffff 0%, #f7fafc 100%);
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
    background: var(--white);
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.99);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
}

.logo h1 {
    font-size: 1.8rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-subtitle {
    font-size: 0.85rem;
    color: var(--text-light);
    display: block;
    font-weight: 400;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    font-size: 0.95rem;
    padding: 0.5rem 0;
}

.nav-menu a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--gradient-1);
    border-radius: 2px;
    transition: var(--transition);
}

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

.nav-menu a:hover::before {
    width: 100%;
}

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

.nav-menu a.active::before {
    width: 100%;
}

.lang-switcher {
    margin-left: 1rem;
}

.lang-btn {
    background: var(--gradient-1);
    color: var(--white);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow);
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.lang-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.lang-btn:hover::before {
    width: 300px;
    height: 300px;
}

.lang-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.lang-btn:active {
    transform: translateY(0);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

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

/* Hero 区域 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    margin-top: 70px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    animation: float 15s ease-in-out infinite reverse;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.2);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    animation: fadeInUp 1s ease;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
    line-height: 1.2;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.4rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    font-weight: 300;
    line-height: 1.6;
}

.btn {
    display: inline-block;
    padding: 1.2rem 3rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: var(--white);
    color: var(--secondary-color);
    border: 2px solid var(--white);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-2);
    transition: var(--transition);
    z-index: -1;
}

.btn-primary:hover::before {
    left: 0;
}

.btn-primary:hover {
    color: var(--white);
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.btn-primary:active {
    transform: translateY(-2px);
}

/* 通用区块样式 */
section {
    padding: 6rem 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.8rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    font-weight: 700;
    letter-spacing: -1px;
}

.underline {
    width: 100px;
    height: 5px;
    background: var(--gradient-1);
    margin: 0 auto;
    border-radius: 10px;
    position: relative;
}

.underline::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background: var(--accent-color);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(233, 69, 96, 0.5);
}

/* 关于我们 */
.about {
    background: var(--bg-gradient);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    position: relative;
    z-index: 1;
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.15rem;
    line-height: 1.9;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    text-align: center;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.feature-card {
    text-align: center;
    padding: 2.5rem 2rem;
    background: var(--white);
    border-radius: 20px;
    transition: var(--transition);
    box-shadow: var(--shadow);
    border: 1px solid rgba(102, 126, 234, 0.1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-1);
    opacity: 0.05;
    transition: var(--transition);
}

.feature-card:hover::before {
    left: 0;
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: rgba(102, 126, 234, 0.3);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-1);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.feature-card:hover .feature-icon {
    transform: rotate(360deg) scale(1.1);
    box-shadow: var(--shadow-lg);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.product-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
}

.product-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-1);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.product-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.product-card:hover::after {
    opacity: 0.03;
}

.product-image {
    height: 280px;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-card:nth-child(1) .product-image {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.product-card:nth-child(2) .product-image {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.product-card:nth-child(3) .product-image {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.product-card:nth-child(4) .product-image {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.product-card:nth-child(5) .product-image {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.product-card:nth-child(6) .product-image {
    background: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
}

.product-image::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

.product-image:nth-child(even)::before {
    animation-direction: reverse;
}

.product-placeholder {
    color: var(--white);
    font-size: 1.8rem;
    font-weight: 700;
    z-index: 1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    letter-spacing: 1px;
}

.product-info {
    padding: 2rem;
    position: relative;
    z-index: 1;
    background: var(--white);
}

.product-info h3 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 1.4rem;
    font-weight: 600;
}

.product-info p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* 服务优势 */
.services {
    background: var(--bg-light);
    position: relative;
}

.services-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2.5rem;
}

.service-item {
    text-align: center;
    padding: 3rem 2rem;
    position: relative;
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    overflow: hidden;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: var(--transition);
}

.service-item:hover::before {
    transform: scaleX(1);
}

.service-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.service-number {
    font-size: 5rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.15;
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 0;
    transition: var(--transition);
}

.service-item:hover .service-number {
    opacity: 0.25;
    transform: translateX(-50%) scale(1.1);
}

.service-item h3 {
    color: var(--primary-color);
    margin: 2rem 0 1rem;
    position: relative;
    z-index: 1;
    font-size: 1.3rem;
    font-weight: 600;
}

.service-item p {
    color: var(--text-light);
    position: relative;
    z-index: 1;
    line-height: 1.7;
}

/* 联系我们 */
.contact {
    background: var(--white);
    position: relative;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.info-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 15px;
    transition: var(--transition);
    border: 2px solid transparent;
}

.info-item:hover {
    transform: translateX(10px);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-md);
}

.info-icon {
    font-size: 2.5rem;
    min-width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-1);
    border-radius: 15px;
    filter: drop-shadow(0 4px 8px rgba(102, 126, 234, 0.3));
    transition: var(--transition);
}

.info-item:hover .info-icon {
    transform: scale(1.1) rotate(5deg);
}

.info-text h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.info-text p {
    color: var(--text-light);
    line-height: 1.6;
}

.contact-form {
    background: var(--white);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.contact-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--gradient-1);
}

.form-group {
    margin-bottom: 2rem;
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1.2rem 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
    background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-group label {
    display: block;
    margin-bottom: 0.8rem;
    color: var(--text-color);
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.form-group input:focus + label,
.form-group textarea:focus + label {
    color: var(--secondary-color);
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: var(--white);
    padding: 4rem 0 1.5rem;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

.footer-section h3 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    font-weight: 600;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.8rem;
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
    position: relative;
}

.footer-section a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
    padding-left: 8px;
}

.footer-section a:hover::before {
    width: 100%;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    position: relative;
    z-index: 1;
}

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

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(30px, -30px) rotate(120deg);
    }
    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 返回顶部按钮 */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-1);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

.scroll-to-top:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--shadow-xl);
}

.scroll-to-top:active {
    transform: translateY(-2px) scale(1.05);
}

.scroll-to-top svg {
    transition: var(--transition);
}

.scroll-to-top:hover svg {
    transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
        gap: 0.5rem;
    }

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

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 1rem 2rem;
        width: 100%;
    }

    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-header h2 {
        font-size: 2.2rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .about-features,
    .products-grid,
    .services-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .btn {
        padding: 1rem 2rem;
        font-size: 0.95rem;
    }

    section {
        padding: 4rem 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

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

    .btn {
        padding: 0.9rem 1.8rem;
        font-size: 0.9rem;
    }

    section {
        padding: 3rem 0;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .contact-form {
        padding: 2rem 1.5rem;
    }

    .feature-card,
    .product-card,
    .service-item {
        padding: 1.5rem;
    }
}