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

:root {
    --primary-color: #1a1a1a;
    --secondary-color: #f5f5f5;
    --accent-color: #4a4a4a;
    --text-color: #333;
    --text-light: #666;
    --border-color: #e0e0e0;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

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

.container {
    max-width: 1200px;
    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;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 400;
    transition: var(--transition);
    position: relative;
}

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

/* Hero 区域 */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 100vh;
    padding: 100px 40px 60px;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-content {
    padding: 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid var(--primary-color);
}

.cta-button:hover {
    background: transparent;
    color: var(--primary-color);
}

.hero-image {
    position: relative;
    height: 500px;
}

.hero-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 产品区域 */
.products {
    padding: 100px 0;
    background: var(--secondary-color);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 4rem;
    font-size: 1.1rem;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.product-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.product-image {
    width: 100%;
    height: 300px;
    overflow: hidden;
    background: var(--secondary-color);
}

.product-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f0f0f0 0%, #e5e5e5 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.product-info {
    padding: 1.5rem;
}

.product-name {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.product-category {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-price {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* 关于我们 */
.about {
    padding: 100px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-description {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-features {
    margin-top: 3rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.feature-text h4 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

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

.about-image {
    height: 500px;
}

.about-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 联系方式 */
.contact {
    padding: 100px 0;
    background: var(--secondary-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
}

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

.contact-item h4 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-form input,
.contact-form textarea {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-button {
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.submit-button:hover {
    background: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 3rem 0;
}

.footer-content {
    text-align: center;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-text {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

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

/* 响应式设计 */
@media (max-width: 968px) {
    .hero {
        grid-template-columns: 1fr;
        padding: 120px 20px 60px;
        text-align: center;
    }

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

    .about-content {
        grid-template-columns: 1fr;
    }

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

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        padding: 2rem;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        transition: var(--transition);
        border-top: 1px solid var(--border-color);
    }

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

    .menu-toggle {
        display: flex;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }

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

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

    .hero-image,
    .about-image {
        height: 300px;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}