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

:root {
    --primary-color: #2E8B57; /* 海绿色 - 代表环保 */
    --secondary-color: #20B2AA; /* 浅海绿色 */
    --accent-color: #3CB371; /* 中海绿色 */
    --text-dark: #2C3E50;
    --text-light: #5D6D7E;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --border-light: #E9ECEF;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 5px 20px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

/* 头部导航 */
.header {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100px;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    position: relative;
}

.company-logo {
    height: 80px;
    width: auto;
    max-width: 300px;
    object-fit: contain;
    transition: var(--transition);
    display: block;
}

.company-logo:hover {
    transform: scale(1.05);
}

/* 当图片无法加载时，ALT文本会自动显示 */

/* 响应式设计 */
@media (max-width: 768px) {
    .company-logo {
        height: 60px;
        max-width: 220px;
    }
    
    .logo-container {
        min-height: 60px;
    }
}

@media (max-width: 480px) {
    .company-logo {
        height: 50px;
        max-width: 180px;
    }
    
    .logo-container {
        min-height: 50px;
    }
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

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

/* 主要内容区域 */
main {
    margin-top: 100px;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--bg-light) 0%, #E8F5E8 100%);
    padding: 100px 0;
    min-height: 600px;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h2 {
    font-size: 3rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-text h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

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

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-graphic {
    position: relative;
    text-align: center;
}

.hero-graphic .fa-leaf {
    font-size: 8rem;
    color: #90EE90; /* 浅绿色 */
    opacity: 0.9;
    filter: drop-shadow(0 4px 8px rgba(144, 238, 144, 0.3));
}

.green-circles {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.green-circles .circle {
    position: absolute;
    border: 3px solid var(--secondary-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.green-circles .circle:nth-child(1) {
    width: 100px;
    height: 100px;
    margin-left: -50px;
    margin-top: -50px;
    animation-delay: 0s;
}

.green-circles .circle:nth-child(2) {
    width: 150px;
    height: 150px;
    margin-left: -75px;
    margin-top: -75px;
    animation-delay: 0.5s;
}

.green-circles .circle:nth-child(3) {
    width: 200px;
    height: 200px;
    margin-left: -100px;
    margin-top: -100px;
    animation-delay: 1s;
}

@keyframes pulse {
    0% {
        transform: scale(0.8);
        opacity: 1;
    }
    100% {
        transform: scale(1.2);
        opacity: 0;
    }
}

/* 公共区域样式 */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 3rem;
    font-weight: 700;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* 产品特色 */
.features {
    background: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.feature-icon i {
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    color: var(--text-dark);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 公司优势 */
.advantages {
    background: var(--bg-light);
}

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

.advantages-text h2 {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 2rem;
    font-weight: 700;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.advantage-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-top: 0.2rem;
}

.advantage-item h4 {
    color: var(--text-dark);
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

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

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.stat-item h3 {
    font-size: 3rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-item p {
    color: var(--text-light);
    font-weight: 500;
}

/* 合作伙伴 */
.partners {
    background: var(--bg-light);
}

.partners-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    font-weight: 400;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2.5rem;
    align-items: center;
    justify-items: center;
}

.partner-item {
    text-align: center;
    transition: var(--transition);
    padding: 1.5rem;
    border-radius: 12px;
    background: var(--bg-white);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    width: 100%;
    max-width: 220px;
}

.partner-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.partner-logo {
    width: 120px;
    height: 80px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8f9fa;
    border-radius: 8px;
    overflow: hidden;
}

.partner-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: var(--transition);
}

.partner-item:hover .partner-logo img {
    transform: scale(1.05);
}

.partner-item h3 {
    color: var(--text-dark);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

/* 快速入口 */
.quick-access {
    background: var(--bg-white);
}

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

.access-card {
    background: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.access-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    color: inherit;
}

.access-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.access-card h3 {
    color: var(--text-dark);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

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

/* 页脚 */
.footer {
    background: linear-gradient(135deg, var(--text-dark) 0%, #34495E 100%);
    color: white;
    padding: 80px 0 30px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1.5fr 1.5fr;
    gap: 3rem;
    margin-bottom: 3rem;
    position: relative;
    z-index: 1;
}

.footer-section h3 {
    color: var(--secondary-color);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    position: relative;
}

.footer-section h3::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--primary-color);
    margin-top: 0.5rem;
    border-radius: 2px;
}

.footer-section h4 {
    color: white;
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
    position: relative;
}

.footer-section h4::after {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background: var(--accent-color);
    margin-top: 0.5rem;
    border-radius: 1px;
}

.footer-section p {
    color: #BDC3C7;
    margin-bottom: 1.2rem;
    line-height: 1.8;
    font-size: 0.95rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 12px;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.2rem;
    position: relative;
    overflow: hidden;
}

.social-links a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition);
}

.social-links a:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(46, 139, 87, 0.3);
}

.social-links a:hover::before {
    left: 100%;
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
}

.contact-info i {
    color: var(--secondary-color);
    width: 20px;
}

.contact-info a {
    color: #BDC3C7;
    text-decoration: none;
    transition: var(--transition);
}

.contact-info a:hover {
    color: var(--secondary-color);
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: #BDC3C7;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 2px solid #34495E;
    padding-top: 2.5rem;
    text-align: center;
    position: relative;
}

.footer-bottom::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.footer-bottom p {
    color: #BDC3C7;
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 100px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 100px);
        background: var(--bg-white);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 2rem;
        transition: var(--transition);
        box-shadow: var(--shadow);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-text h2 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .advantages-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .hero-text h2 {
        font-size: 1.8rem;
    }
    
    .hero-text h3 {
        font-size: 1.2rem;
    }
    
    .hero-text p {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .feature-card,
    .access-card {
        padding: 2rem 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2.5rem;
    }
    
    .footer {
        padding: 60px 0 25px;
    }
    
    .social-links {
        justify-content: center;
    }
}

/* 加载动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}