/* 全局样式设置 */
:root {
    --primary-color: #0071e3;
    --secondary-color: #f5f5f7;
    --text-color: #1d1d1f;
    --text-secondary: #6e6e73;
    --white: #ffffff;
    --black: #000000;
    --border-radius: 12px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    --transition: all 0.3s ease;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    --box-shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

/* 导航栏样式 */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.main-nav.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--box-shadow);
}

.main-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem var(--spacing-md);
    max-width: 1440px;
    margin: 0 auto;
}

.logo .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

/* 移动端导航按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    cursor: pointer;
    z-index: 1001;
}

.toggle-icon {
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition);
}

.nav-toggle.active .toggle-icon:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

.nav-toggle.active .toggle-icon:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .toggle-icon:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* 英雄区域样式 */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 60px;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-md);
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.4;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 0.85rem 2rem;
    border-radius: 25px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1rem;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

.btn-primary:hover {
    background-color: #005bb5;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 113, 227, 0.3);
}

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

.btn-secondary:hover {
    background-color: #e5e5e7;
    transform: translateY(-2px);
}

.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
    filter: brightness(1.1);
}

/* 通用区域标题 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    text-align: center;
    line-height: 1.2;
}

/* 关于我们区域样式 */
.about-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--white);
}

.about-section .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-content {
    padding: var(--spacing-md) 0;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.about-image {
    overflow: hidden;
    border-radius: var(--border-radius);
}

.about-img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.about-img:hover {
    transform: scale(1.03);
}

/* 主要项目板块样式 */
.projects-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--secondary-color);
}

.projects-section .container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.project-card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

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

.project-image-container {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.project-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-content {
    padding: var(--spacing-md);
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: var(--spacing-xs);
}

.project-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.project-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.project-link:hover {
    color: #005bb5;
}

.project-link i {
    margin-left: var(--spacing-xs);
    transition: var(--transition);
}

.project-link:hover i {
    transform: translateX(3px);
}

/* 业务优势样式 */
.features-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--white);
}

.features-section .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-md);
    transition: var(--transition);
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: 2rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.feature-item:hover .feature-icon {
    background-color: var(--primary-color);
    color: var(--white);
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: var(--spacing-xs);
}

.feature-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 联系我们样式 */
.contact-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--secondary-color);
}

.contact-section .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.contact-info {
    padding: var(--spacing-md) 0;
}

.contact-info .section-title {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.contact-details {
    margin-bottom: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 1rem;
}

.contact-item i {
    margin-right: var(--spacing-sm);
    color: var(--primary-color);
    font-size: 1.2rem;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

.social-link:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 113, 227, 0.3);
}

.contact-image {
    overflow: hidden;
    border-radius: var(--border-radius);
}

.contact-img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.contact-img:hover {
    transform: scale(1.03);
}

/* 页脚样式 */
.footer {
    background-color: var(--white);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.footer .container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-logo {
    margin-bottom: var(--spacing-md);
}

.footer-logo .logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-color);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--text-color);
}

.copyright {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.copyright-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

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

.back-to-top:hover {
    background-color: #005bb5;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 113, 227, 0.3);
}

.back-to-top i {
    font-size: 1.2rem;
}

/* 图片加载动画 */
img {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

img.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .about-grid, .contact-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .about-content .section-title, .contact-info .section-title {
        text-align: center;
    }
    
    .about-text {
        text-align: center;
    }
    
    .contact-details {
        text-align: center;
        justify-content: center;
    }
    
    .contact-item {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background-color: var(--white);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px var(--spacing-md);
        transition: var(--transition);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        text-align: center;
    }
    
    .hero-cta {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .about-text, .project-description, .feature-description {
        font-size: 0.95rem;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 1rem;
        right: 1rem;
    }
}
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .project-title {
        font-size: 1.8rem;
    }
}


/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background-color: #0d6efd;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 99;
}

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

.back-to-top:hover {
    background-color: #0a58ca;
    transform: translateY(-3px);
    color: white;
}

/* 项目详情页图片画廊样式 */
.project-image-gallery {
    width: 100%;
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.main-image {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.image-thumbnails {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 8px;
}

.thumbnail {
    width: 100%;
    height: 120px;
    object-fit: cover;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
    border: 2px solid transparent;
}

.thumbnail:hover {
    transform: scale(1.03);
    border-color: var(--primary-color);
}

.thumbnail.active {
    border-color: var(--primary-color);
}

/* 增强排版可读性 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

p {
    margin-bottom: 1.2rem;
    line-height: 1.7;
}

/* 响应式图片画廊 */
@media (max-width: 768px) {
    .image-thumbnails {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .thumbnail {
        height: 100px;
    }
}

@media (max-width: 480px) {
    .image-thumbnails {
        grid-template-columns: repeat(2, 1fr);
        gap: 4px;
    }
    
    .thumbnail {
        height: 80px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s ease forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}