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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 颜色定义 */
:root {
    --eco-green: #2E7D32;
    --tech-blue: #1976D2;
    --light-green: #4CAF50;
    --light-blue: #64B5F6;
    --dark-gray: #333;
    --light-gray: #f5f5f5;
}

/* 头部导航 */
header {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--eco-green);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2rem;
}

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--dark-gray);
    margin: 2px 0;
    transition: all 0.3s ease;
}

/* Banner 样式 */
.banner {
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.carousel {
    position: relative;
    width: 100%;
    height: 60vh;
    max-height: 800px;
    min-height: 400px;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    background-color: #f0f0f0;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.carousel-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    z-index: 10;
}

.carousel-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.carousel-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.carousel-prev, .carousel-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.5);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 20;
    transition: background 0.3s ease;
}

.carousel-prev:hover, .carousel-next:hover {
    background: rgba(0,0,0,0.8);
}

.carousel-prev {
    left: 20px;
}

.carousel-next {
    right: 20px;
}

.carousel-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 20;
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: background 0.3s ease;
}

.carousel-dot.active {
    background: white;
}

.about-banner, .contact-banner {
    background: url('images/banner-about.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
    padding: 4rem 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.about-banner h1, .contact-banner h1 {
    font-size: 2rem;
}

/* 核心优势 */
.core-advantages {
    padding: 4rem 0;
    background-color: var(--light-gray);
}

.core-advantages h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--dark-gray);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.advantage-item {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-5px);
}

.advantage-icon {
    margin-bottom: 1rem;
}

.advantage-icon img {
    width: 80px;
    height: 80px;
    object-fit: contain;
}

.advantage-item h3 {
    color: var(--eco-green);
    margin-bottom: 1rem;
}

/* 业务介绍 */
.business-intro {
    padding: 4rem 0;
}

.business-intro h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--dark-gray);
}

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

.business-item {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
    border-top: 4px solid var(--tech-blue);
}

.business-item h3 {
    color: var(--tech-blue);
    margin-bottom: 1rem;
}

/* 关于我们 */
.company-intro, .social-responsibility {
    padding: 4rem 0;
}

.company-intro h2, .social-responsibility h2 {
    margin-bottom: 2rem;
    color: var(--eco-green);
}

.social-responsibility {
    background-color: var(--light-gray);
}

.social-responsibility ul {
    list-style: none;
    margin-top: 1rem;
}

.social-responsibility li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.social-responsibility li::before {
    content: "•";
    color: var(--eco-green);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* 联系我们 */
.contact-info {
    padding: 4rem 0;
}

.contact-details {
    margin-bottom: 3rem;
}

.contact-details h2, .contact-form h2 {
    margin-bottom: 2rem;
    color: var(--tech-blue);
}

.contact-form form {
    background-color: var(--light-gray);
    padding: 2rem;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group textarea {
    resize: vertical;
}

.btn {
    background-color: var(--eco-green);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: var(--light-green);
}

/* 商务合作板块样式 */
#business-cooperation {
    margin: 3rem 0;
}

.coop-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.coop-card {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.coop-card:hover {
    transform: translateY(-5px);
}

.coop-card .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.coop-card h3 {
    color: var(--eco-green);
    margin-bottom: 1rem;
}

.coop-cta {
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    margin-top: 2rem;
}

/* 统一页脚样式 */
.site-footer {
    width: 100%;
    margin-top: 40px;
}

.footer-mission {
    background-color: #0f766e;
    color: white;
    padding: 1.5rem 0;
    text-align: center;
    font-size: 1.1rem;
}

.footer-copyright {
    background-color: #064e3b;
    color: white;
    padding: 1rem 0;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

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

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: white;
        flex-direction: column;
        align-items: center;
        padding: 1rem 0;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s ease;
        pointer-events: none;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-links li {
        margin: 0.5rem 0;
    }

    .banner h1 {
        font-size: 2rem;
    }

    .banner p {
        font-size: 1rem;
    }

    .advantages-grid, .business-grid, .coop-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .coop-card {
        padding: 20px;
    }

    .coop-card .icon {
        font-size: 36px;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    .banner {
        padding: 4rem 0;
    }

    .banner h1 {
        font-size: 1.8rem;
    }

    .core-advantages, .business-intro, .company-intro, .social-responsibility, .contact-info {
        padding: 2rem 0;
    }

    .advantage-item, .business-item {
        padding: 1.5rem;
    }
}

/* 导航栏动画 */
.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

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