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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #e67e22;
    --accent-color: #3498db;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gray: #6c757d;
    --border-color: #dee2e6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
}

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

/* 导航栏 */
.header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

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

.logo h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.main-nav {
    display: flex;
    gap: 30px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

.nav-icons {
    display: flex;
    gap: 20px;
}

.nav-icons .icon {
    font-size: 20px;
    text-decoration: none;
    transition: transform 0.3s;
}

.nav-icons .icon:hover {
    transform: scale(1.1);
}

/* 主横幅 */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.hero-title-main {
    font-size: 60px;
    font-weight: 700;
    letter-spacing: 2px;
}

.hero-title-sub {
    font-size: 60px;
    font-weight: 700;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-image {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background: var(--secondary-color);
    color: var(--white);
}

.btn-primary:hover {
    background: #d35400;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(230, 126, 34, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
}

.btn-large {
    padding: 18px 50px;
    font-size: 18px;
    width: 100%;
    max-width: 300px;
}

/* 创新区域 */
.innovation-section {
    padding: 100px 0;
    background: var(--white);
}

.innovation-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.innovation-text h2 {
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 30px;
    line-height: 1.2;
}

.innovation-description {
    margin-bottom: 30px;
}

.innovation-description p {
    margin-bottom: 15px;
    color: var(--gray);
    font-size: 18px;
    line-height: 1.8;
}

/* 占位图片 */
.placeholder-image {
    background: var(--light-bg);
    border-radius: 20px;
    overflow: hidden;
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder {
    font-size: 80px;
    opacity: 0.3;
}

.innovation-img {
    height: 400px;
}

/* 产品亮点 */
.highlight-section {
    padding: 100px 0;
    background: var(--light-bg);
}

.section-title {
    text-align: center;
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.feature-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--gray);
    font-size: 16px;
}

/* 革新区域 */
.revolution-section {
    padding: 100px 0;
    background: var(--white);
    text-align: center;
}

.revolution-content h2 {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.revolution-text {
    max-width: 800px;
    margin: 0 auto 50px;
    font-size: 18px;
    color: var(--gray);
    line-height: 1.8;
}

.video-container {
    max-width: 900px;
    margin: 0 auto;
}

.video-placeholder {
    background: var(--light-bg);
    border-radius: 20px;
    padding: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.play-button {
    font-size: 60px;
    opacity: 0.6;
    cursor: pointer;
    transition: transform 0.3s;
}

.play-button:hover {
    transform: scale(1.1);
}

/* 舒适智能区域 */
.comfort-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: var(--white);
}

.comfort-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.comfort-text h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.comfort-text p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.95;
}

.image-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.grid-item {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 60px;
    text-align: center;
    font-size: 50px;
    transition: transform 0.3s;
}

.grid-item:hover {
    transform: scale(1.05);
}

/* 产品展示 */
.product-section {
    padding: 100px 0;
    background: var(--white);
}

.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.product-img {
    height: 500px;
}

.product-name {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.product-price {
    font-size: 32px;
    color: var(--secondary-color);
    font-weight: 700;
    margin-bottom: 25px;
}

.product-description {
    color: var(--gray);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 25px;
}

.product-features {
    list-style: none;
    margin-bottom: 30px;
}

.product-features li {
    padding: 10px 0;
    font-size: 16px;
    color: var(--text-color);
}

/* 用户评价 */
.testimonial-section {
    padding: 100px 0;
    background: var(--light-bg);
}

.testimonial-header h2 {
    text-align: center;
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 60px;
}

.testimonial-card {
    max-width: 900px;
    margin: 0 auto;
    background: var(--white);
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.testimonial-quote {
    margin-bottom: 30px;
}

.testimonial-quote p {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-color);
    font-style: italic;
}

.author-name {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.author-title {
    color: var(--gray);
    font-size: 14px;
}

/* FAQ */
.faq-section {
    padding: 100px 0;
    background: var(--white);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 30px 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.faq-question h3 {
    font-size: 20px;
    color: var(--primary-color);
}

.faq-toggle {
    font-size: 28px;
    color: var(--secondary-color);
    font-weight: 300;
}

.faq-answer {
    padding-top: 20px;
}

.faq-answer p {
    color: var(--gray);
    line-height: 1.8;
}

/* 服务保障 */
.guarantee-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.guarantee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

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

.guarantee-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.guarantee-item h3 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.guarantee-item p {
    color: var(--gray);
    font-size: 14px;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h4 {
    font-size: 18px;
    margin-bottom: 20px;
}

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

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-column a:hover {
    color: var(--white);
}

.newsletter-form {
    display: flex;
    margin-top: 15px;
}

.newsletter-form input {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 5px 0 0 5px;
    font-size: 14px;
}

.newsletter-form button {
    padding: 12px 20px;
    background: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}

.newsletter-form button:hover {
    background: #d35400;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-links a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--white);
}

.copyright {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-wrapper {
        flex-direction: column;
        gap: 20px;
    }

    .hero-title-main,
    .hero-title-sub {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-image {
        display: none;
    }

    .innovation-content,
    .comfort-content,
    .product-showcase {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 32px;
    }

    .innovation-text h2,
    .comfort-text h2 {
        font-size: 32px;
    }

    .features-grid,
    .guarantee-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

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

.hero-content,
.feature-card,
.testimonial-card {
    animation: fadeInUp 0.6s ease-out;
}