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

:root {
    --primary-color: #1a365d;
    --accent-color: #2b6cb0;
    --secondary-color: #4a5568;
    --light-bg: #f7fafc;
    --white: #ffffff;
    --text-dark: #2d3748;
    --text-light: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

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

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

/* 顶部导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    position: relative;
}

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

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-size: 14px;
    padding: 5px 10px;
    transition: var(--transition);
}

.lang-btn.active,
.lang-btn:hover {
    color: var(--primary-color);
    font-weight: 600;
}

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

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

/* 首页轮播图 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}

.carousel {
    position: relative;
    height: 100%;
    width: 100%;
}

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

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

.slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}

.slide-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, rgba(26, 54, 93, 0.8), rgba(26, 54, 93, 0.4));
}

.slide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--white);
    z-index: 2;
    width: 90%;
    max-width: 800px;
}

.slide-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1s ease;
}

.slide-content p {
    font-size: 1.5rem;
    font-weight: 300;
    animation: fadeInUp 1s ease 0.3s both;
}

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

.carousel-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--white);
    transform: scale(1.2);
}

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

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

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 15px;
}

.section-line {
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    margin: 0 auto;
    border-radius: 2px;
}

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

.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.about-text h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.about-text p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: var(--secondary-color);
    text-align: justify;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-bottom: 80px;
}

.feature-card {
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.feature-icon {
    margin-bottom: 20px;
}

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

.feature-card h4 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

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

.advantages-title {
    text-align: center;
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 50px;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.advantage-item {
    text-align: center;
    padding: 40px 30px;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.advantage-icon {
    margin-bottom: 20px;
}

.advantage-icon img {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.advantage-item h4 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.advantage-item p {
    color: var(--secondary-color);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* 展览服务 */
.services-intro {
    max-width: 900px;
    margin: 0 auto 60px;
    text-align: center;
}

.services-intro p {
    font-size: 1.1rem;
    color: var(--secondary-color);
    line-height: 1.9;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.service-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.service-image {
    height: 220px;
    overflow: hidden;
}

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

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

.service-content {
    padding: 25px;
}

.service-content h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.service-content p {
    color: var(--secondary-color);
    line-height: 1.6;
    font-size: 0.9rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.full-service {
    background: var(--light-bg);
    padding: 60px;
    border-radius: 10px;
}

.full-service-title {
    text-align: center;
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 50px;
}

.full-service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.full-service-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.fs-icon {
    margin-bottom: 20px;
}

.fs-icon img {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.full-service-item h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.full-service-item p {
    color: var(--secondary-color);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 项目案例 */
.cases {
    background: var(--light-bg);
}

.cases-intro {
    max-width: 900px;
    margin: 0 auto 50px;
    text-align: center;
}

.cases-intro p {
    font-size: 1.1rem;
    color: var(--secondary-color);
    line-height: 1.9;
    margin-bottom: 20px;
}

.city-filter {
    margin-bottom: 50px;
}

.filter-group {
    margin-bottom: 25px;
}

.filter-group h4 {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 12px;
    font-weight: 600;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    padding: 8px 20px;
    border: 1px solid var(--border-color);
    background: var(--white);
    color: var(--secondary-color);
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 50px;
}

.case-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
}

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

.case-item img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    transition: var(--transition);
}

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

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(26, 54, 93, 0.95), transparent);
    padding: 30px 20px 20px;
    color: var(--white);
    transform: translateY(100%);
    transition: var(--transition);
}

.case-item:hover .case-overlay {
    transform: translateY(0);
}

.case-overlay h4 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.case-overlay p {
    font-size: 0.85rem;
    opacity: 0.9;
}

.case-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(26, 54, 93, 0.9), transparent);
    padding: 40px 20px 20px;
    color: var(--white);
}

.case-info h4 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.case-info p {
    font-size: 0.85rem;
    opacity: 0.9;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-bottom: 40px;
}

.page-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    background: var(--white);
    color: var(--secondary-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: var(--transition);
}

.page-btn:hover:not(:disabled) {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-numbers {
    display: flex;
    gap: 5px;
}

.page-number {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    background: var(--white);
    color: var(--secondary-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.page-number:hover,
.page-number.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* 联系我们 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.company-card {
    background: var(--primary-color);
    color: var(--white);
    padding: 40px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.company-card h3 {
    font-size: 1.4rem;
    margin-bottom: 5px;
}

.company-card h4 {
    font-size: 1.1rem;
    font-weight: 400;
    opacity: 0.9;
    margin-bottom: 30px;
}

.contact-details {
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 15px;
}

.contact-icon {
    font-size: 1.2rem;
}

.wechat-qr {
    text-align: center;
}

.wechat-qr p {
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.qr-placeholder img {
    border-radius: 10px;
}

.service-area {
    background: var(--light-bg);
    padding: 30px;
    border-radius: 10px;
}

.service-area h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.service-area p {
    color: var(--secondary-color);
    line-height: 1.8;
}

.contact-form-wrapper {
    background: var(--white);
    padding: 50px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.contact-form-wrapper h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--secondary-color);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.1);
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(26, 54, 93, 0.3);
}

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

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

.footer-logo {
    margin-bottom: 30px;
}

.footer-logo img {
    height: 40px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 30px;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
}

.footer-copyright {
    opacity: 0.6;
    font-size: 0.9rem;
}

/* 图片弹窗 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

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

.modal-content img {
    width: 1300px;
    height: 750px;
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 10px;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: var(--white);
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.modal-caption {
    color: var(--white);
    text-align: center;
    margin-top: 20px;
    font-size: 1.1rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .about-intro {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .full-service-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 20px;
        box-shadow: var(--shadow);
        transform: translateY(-150%);
        transition: var(--transition);
    }

    .nav.active {
        transform: translateY(0);
    }

    .nav-list {
        flex-direction: column;
        gap: 15px;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .slide-content h1 {
        font-size: 2rem;
    }

    .slide-content p {
        font-size: 1rem;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

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

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

    .full-service-grid {
        grid-template-columns: 1fr;
    }

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

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

    .footer-links {
        flex-wrap: wrap;
        gap: 20px;
    }
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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