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

:root {
    --primary-color: #1a5f2a;
    --primary-dark: #0d4a1a;
    --primary-light: #2e8b3e;
    --secondary-color: #f5a623;
    --text-dark: #333333;
    --text-light: #666666;
    --text-lighter: #999999;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

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

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    box-shadow: 0 4px 15px rgba(26, 95, 42, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(26, 95, 42, 0.4);
}

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

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

.btn-block {
    width: 100%;
    text-align: center;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.navbar.scrolled .logo {
    color: var(--primary-color);
}

.logo i {
    font-size: 28px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.navbar.scrolled .nav-links a {
    color: var(--text-dark);
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

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

.navbar.scrolled .hamburger span {
    background: var(--text-dark);
}

/* Hero 区域 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-overlay {
    display: none;
}

.hero-content {
    text-align: center;
    color: white;
    padding: 40px 60px;
    animation: fadeInUp 1s ease;
    position: relative;
    z-index: 2;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 20px;
    backdrop-filter: blur(5px);
}

.hero-content h1 {
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.8);
}

.hero-content p {
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.8);
}

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

.hero-content h1 {
    font-size: 64px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 4px;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 15px;
    opacity: 0.9;
}

.hero-slogan {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.8;
    font-style: italic;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    z-index: 2;
}

.scroll-indicator i {
    color: white;
    font-size: 30px;
    opacity: 0.7;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* 通用区块样式 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.underline {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    margin: 0 auto;
    border-radius: 2px;
}

.section-desc {
    color: var(--text-light);
    margin-top: 20px;
    font-size: 16px;
}

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

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

.about-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-image video {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
}

.about-text h3 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.8;
}

.about-text strong {
    color: var(--primary-color);
}

.about-text em {
    color: var(--secondary-color);
    font-style: normal;
    font-weight: 500;
}

.values {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

.value-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary-color);
    font-weight: 500;
}

.value-item i {
    font-size: 20px;
}

/* 服务项目 */
.services {
    background: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.service-card {
    background: white;
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 30px;
}

.service-icon i {
    font-size: 40px;
    color: white;
}

.service-card h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.service-card p {
    color: var(--text-light);
    margin-bottom: 25px;
    line-height: 1.7;
}

.service-features {
    list-style: none;
    text-align: left;
}

.service-features li {
    padding: 10px 0;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 12px;
}

.service-features i {
    color: var(--primary-color);
    font-size: 14px;
}

/* 优势区块 */
.advantages {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.advantages .section-header h2 {
    color: white;
}

.advantages .underline {
    background: var(--secondary-color);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.advantage-item {
    text-align: center;
    padding: 30px 20px;
}

.advantage-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    transition: var(--transition);
}

.advantage-item:hover .advantage-icon {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.1);
}

.advantage-icon i {
    font-size: 32px;
    color: var(--secondary-color);
}

.advantage-item h4 {
    font-size: 20px;
    margin-bottom: 10px;
}

.advantage-item p {
    opacity: 0.85;
    font-size: 14px;
}

/* 案例展示 */
.cases {
    background: var(--bg-white);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.hidden-cases {
    display: none;
    margin-top: 20px;
}

.hidden-cases.show {
    display: grid;
}

.case-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 1;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-item:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-lg);
}

.case-item video {
    display: none;
}

.case-item {
    background: linear-gradient(135deg, #1a5f2a 0%, #2d8a3e 100%);
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: var(--transition);
    pointer-events: none;
}

.case-item:hover .case-overlay {
    background: rgba(26, 95, 42, 0.7);
}

.case-overlay i {
    font-size: 50px;
    color: white;
    margin-bottom: 10px;
}

.case-overlay span {
    color: white;
    font-size: 14px;
}

.load-more {
    text-align: center;
    margin-top: 40px;
}

/* 视频弹窗 */
.video-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.video-modal.show {
    display: flex;
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 900px;
}

.close-modal {
    position: absolute;
    top: -50px;
    right: 0;
    font-size: 40px;
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--secondary-color);
}

.modal-content video {
    width: 100%;
    border-radius: 10px;
}

/* 联系我们 */
.contact {
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.contact-item {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 24px;
    color: white;
}

.contact-text h4 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-text p {
    color: var(--text-light);
    font-size: 15px;
}

.contact-form-wrapper {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.contact-form-wrapper h3 {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 30px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #eee;
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
}

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

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

.footer-content {
    text-align: center;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-logo i {
    font-size: 32px;
}

.footer-slogan {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
}

.footer-services {
    display: flex;
    justify-content: center;
    gap: 15px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-services .divider {
    opacity: 0.4;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

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

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: var(--shadow);
    }
    
    .nav-links.show {
        display: flex;
    }
    
    .nav-links a {
        color: var(--text-dark);
        padding: 15px 0;
        border-bottom: 1px solid #eee;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-content h1 {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-image {
        order: -1;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .values {
        flex-direction: column;
        gap: 15px;
    }
    
    section {
        padding: 60px 0;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 32px;
        letter-spacing: 2px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: 12px 28px;
        font-size: 14px;
    }
    
    .service-card {
        padding: 30px 25px;
    }
    
    .contact-form-wrapper {
        padding: 25px;
    }
}