/* 基础样式 */
:root {
    --primary-color: #1a365d;
    --secondary-color: #2b6cb0;
    --accent-color: #4299e1;
    --text-color: #2d3748;
    --light-bg: #f7fafc;
    --white: #ffffff;
    --dark-blue: #1a365d;
    --medium-blue: #2b6cb0;
    --light-blue: #4299e1;
    --gray-dark: #4a5568;
    --gray-medium: #718096;
    --gray-light: #e2e8f0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    margin: 0;
    padding: 0;
    background-color: var(--white);
}

/* 头部样式 */
header {
    background-color: var(--white);
    color: var(--primary-color);
    padding: 0 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border-bottom: 1px solid rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    font-weight: 500;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    padding: 0.5rem 0;
    gap: 0.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.search-bar {
    display: flex;
    align-items: center;
}

.search-bar input {
    padding: 0.5rem 1rem;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    font-size: 0.9rem;
    width: 200px;
    min-width: 120px;
    flex-grow: 0;
}

@media (max-width: 768px) {
    .header-top {
        padding: 0.5rem;
    }
    .search-bar input {
        width: 150px;
    }
    .search-bar button {
        min-width: 50px;
        padding: 0.5rem;
    }
}

.search-bar button {
    padding: 0.5rem 1rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s;
    min-width: 80px;
    white-space: nowrap;
    flex-shrink: 0;
}

.search-bar button:hover {
    background-color: #2980b9;
}



.logo img:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

@media (max-width: 768px) {
    .logo img {
        max-width: 140px;
        padding: 8px;
    }
}

@media (max-width: 768px) {
    .logo img {
        max-width: 140px;
    }
}

nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--gray-light);
    padding: 1.5rem 0;
    justify-content: center;
    width: 100%;
    background-color: var(--white);
}

nav li {
    margin: 0 2rem;
    position: relative;
    flex: 0 0 auto;
}

nav a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    padding: 1rem 0;
    display: block;
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

nav a:hover {
    color: var(--secondary-color);
    transform: translateY(-2px);
}

nav a:hover::after {
    width: 100%;
}

@media (max-width: 768px) {
    nav li {
        margin: 0 1rem;
    }
    
    nav a {
        font-size: 1rem;
        padding: 0.8rem 0;
    }
}

.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    min-width: 200px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    border-radius: 0 0 4px 4px;
    z-index: 1;
    padding: 0.5rem 0;
}

.submenu li {
    margin: 0;
    padding: 0;
}

.submenu a {
    padding: 0.75rem 1.5rem;
    border-bottom: none;
}

.submenu a:hover {
    background-color: var(--light-bg);
}

/* 主要内容区域 */
main {
    padding: 6rem 2rem 2rem;
}

.banner {
    margin: 2rem 0;
    text-align: center;
}

.banner img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.feature-modules {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.module {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.module:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.module h3 {
    color: var(--secondary-color);
    margin-top: 0;
}

.products {
    margin: 3rem 0;
}

.products h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

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

.product-item {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.product-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
}

.product-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.product-item h3 {
    color: var(--secondary-color);
    margin: 0.5rem 0;
}

.product-item p {
    color: var(--text-color);
    font-size: 0.9rem;
}

.hero {
    text-align: center;
    padding: 8rem 2rem;
    margin: 0 auto 2rem;
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--medium-blue) 100%);
    color: var(--white);
    position: relative;
    background-size: cover;
    max-width: 1200px;
    border-radius: 8px;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.contact-info {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.contact-form {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
}

@media (max-width: 768px) {
    .contact-content {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
    
    .hero {
        padding: 4rem 1rem;
    }
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h2 {
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.hero p {
    font-size: 1.4rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    font-weight: 400;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.hero-btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

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

.hero-btn-primary:hover {
    background-color: var(--light-bg);
    transform: translateY(-2px);
}

.hero-btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.hero-btn-secondary:hover {
    background-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

/* 服务区域 */
.services {
    margin-bottom: 3rem;
}

.services h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

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

.service-item {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    text-align: center;
    border: none;
}

.service-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.15);
}

.service-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    object-fit: contain;
}

.service-item h3 {
    color: var(--secondary-color);
    margin: 0.5rem 0 1rem;
    font-size: 1.3rem;
}

.service-item p {
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.6;
}

.qrcode-container {
    text-align: center;
    margin: 1.5rem 0;
    padding: 1rem;
    background-color: var(--light-bg);
    border-radius: 8px;
}

.qrcode-container img {
    display: block;
    margin: 0 auto 1rem;
    border: 1px solid #ddd;
    padding: 10px;
    background: white;
}

.qrcode-container p {
    margin: 0;
    color: var(--primary-color);
    font-weight: 500;
}

/* 关于页面样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

.about-content h2 {
    color: var(--primary-color);
    margin: 2rem 0 1rem;
    font-size: 1.8rem;
}

.about-content p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.about-content ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.about-content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.about-company {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-intro h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.about-intro p {
    margin-bottom: 2rem;
    line-height: 1.8;
}

.company-stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    min-width: 120px;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-medium);
}

.about-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.team-section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    color: var(--gray-medium);
}

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

.team-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    text-align: center;
}

.team-image {
    width: 120px;
    height: 120px;
    background: var(--gray-light);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    background-size: cover;
}

.timeline-section {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 3rem;
}

.timeline-date {
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    text-align: center;
    background: var(--white);
    padding: 0.5rem;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    font-weight: 600;
    color: var(--secondary-color);
}

.timeline-content {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.timeline-content h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* 页脚样式 */
footer {
    background-color: var(--white);
    color: var(--primary-color);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid rgba(0,0,0,0.1);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}

.case-studies {
    background-color: var(--white);
    padding: 3rem 2rem;
    margin: 2rem 0;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
}

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

.case-item {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    border: none;
}

.case-item h3 {
    color: var(--primary-color);
    margin-top: 0;
}

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

footer h2 {
    margin-top: 0;
}

footer p {
    margin: 0.5rem 0;
}

/* 响应式设计 - 移动优先 */
@media (min-width: 1200px) {
    :root {
        --base-font-size: 18px;
    }
}

@media (max-width: 1199px) {
    :root {
        --base-font-size: 16px;
    }
}

@media (max-width: 992px) {
    .about-grid,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .hero h2 {
        font-size: 2.2rem;
    }
    
    .hero p {
        font-size: 1.2rem;
    }
}

/* 平板设备 */
@media (max-width: 768px) {
    :root {
        --base-font-size: 15px;
    }
    
    header {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
        position: relative;
    }

    .header-top {
        flex-direction: column;
        gap: 1rem;
    }

    .search-bar {
        width: 100%;
        justify-content: center;
    }

    nav ul {
        margin-top: 1rem;
        flex-direction: column;
        display: none;
        width: 100%;
    }

    nav ul.show {
        display: flex;
    }

    nav li {
        margin: 0.5rem 0;
    }

    .hero {
        padding: 3rem 1rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }

    .menu-toggle {
        position: absolute;
        top: 1rem;
        right: 1rem;
        background: none;
        border: none;
        color: white;
        font-size: 1.5rem;
        cursor: pointer;
    }
    
    .product-grid,
    .service-grid,
    .team-grid,
    .case-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    :root {
        --base-font-size: 14px;
    }
    
    .hero {
        padding: 2rem 1rem;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .product-grid,
    .service-grid,
    .team-grid,
    .case-grid {
        grid-template-columns: 1fr;
    }
    
    .company-stats {
        flex-direction: column;
    }
    
    .stat-item {
        width: 100%;
        margin-bottom: 1rem;
    }
    
    .about-content h2 {
        font-size: 1.5rem;
    }
}

/* 超小屏幕设备 */
@media (max-width: 360px) {
    :root {
        --base-font-size: 13px;
    }
    
    .search-bar input {
        width: 120px;
    }
    
    .logo img {
        max-width: 120px;
    }
}