/* ==================== 基础设置 ==================== */

/* 无障碍：屏幕阅读器专用，视觉上隐藏 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

:root {
    --primary-color: #0066cc;
    --secondary-color: #004499;
    --accent-color: #00a8ff;
    --dark-bg: #1a1a2e;
    --light-bg: #f5f7fa;
    --text-dark: #333;
    --text-light: #666;
    --white: #fff;
    --border-radius: 8px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--white);
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

.btn-outline {
    border-color: var(--white);
    color: var(--white);
    margin-left: 15px;
}

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

/* ==================== 头部导航 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.header.scrolled {
    background: var(--white);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 50px;
    width: auto;
    max-width: 45vw; /* 手机端最大宽度为屏幕的45% */
}

@media (max-width: 768px) {
    .logo img {
        height: 40px;
        max-width: 45vw;
    }
}

@media (max-width: 480px) {
    .logo img {
        height: 35px;
        max-width: 45vw;
    }
}

.logo span {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
    display: none; /* 隐藏文字，仅显示Logo图标 */
}

.nav ul {
    display: flex;
    gap: 30px;
}

.nav a {
    font-size: 15px;
    color: var(--text-dark);
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
}

.nav a:hover {
    color: var(--primary-color);
}

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

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

.mobile-menu-btn {
    display: none;
    font-size: 28px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary-color);
}

/* ==================== Hero 轮播首屏 ==================== */
.hero-carousel {
    position: relative;
    height: 800px;
    min-height: 800px;
    overflow: hidden;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    z-index: 1;
}

.carousel-slide.active {
    opacity: 1;
    z-index: 2;
}

.carousel-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

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

.indicator.active {
    background: var(--white);
    width: 30px;
    border-radius: 6px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin: 20px 0 30px;
    font-size: 18px;
    color: var(--white);
}

.hero-stats .divider {
    opacity: 0.6;
}

.hero-stats strong {
    color: var(--accent-color);
    font-size: 24px;
    font-weight: bold;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 68, 153, 0.85) 0%, rgba(26, 26, 46, 0.75) 100%);
    z-index: -1;
}

.hero-content {
    text-align: center;
    color: var(--white);
    padding: 20px;
    max-width: 900px;
}

.hero-content h1 {
    font-size: 56px;
    font-weight: bold;
    margin-bottom: 20px;
    letter-spacing: 8px;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 15px;
    letter-spacing: 4px;
    color: rgba(255, 255, 255, 0.95);
}

.hero-desc {
    font-size: 18px;
    margin-bottom: 40px;
    color: rgba(255, 255, 255, 0.85);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 第二张轮播图 - 无叠加层，深色文字 */
.slide-2 .hero-bg {
    filter: brightness(1.1);
}

.hero-content-dark {
    color: #1a1a2e;
    text-shadow: 1px 1px 3px rgba(255, 255, 255, 0.8);
}

.hero-content-dark h1 {
    color: #1a1a2e;
    text-shadow: 1px 1px 3px rgba(255, 255, 255, 0.8);
}

.hero-content-dark .hero-subtitle {
    color: #333;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.hero-content-dark .hero-stats {
    color: #444;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

.hero-content-dark .hero-stats strong {
    color: #0066cc;
}

.btn-outline-dark {
    border-color: #0066cc;
    color: #0066cc;
    margin-left: 15px;
}

.btn-outline-dark:hover {
    background: #0066cc;
    color: #fff;
}

@media (max-width: 768px) {
    .btn-outline-dark {
        margin-left: 0;
        margin-top: 15px;
    }
}

/* 第三张轮播：合作伙伴白底 */
.slide-3-white-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #ffffff;
    z-index: -2;
}

.partner-content {
    color: var(--text-dark) !important;
    text-shadow: none !important;
}

.partner-heading {
    font-size: 42px !important;
    color: var(--primary-color) !important;
    text-shadow: none !important;
    letter-spacing: 6px !important;
    margin-bottom: 10px !important;
}

.partner-desc {
    font-size: 18px !important;
    color: var(--text-light) !important;
    margin-bottom: 40px !important;
    text-shadow: none !important;
}

.partner-logos {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}

.partner-col {
    text-align: center;
}

.partner-col h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
}

.partner-col img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    background: #fff;
}

@media (max-width: 768px) {
    .partner-heading {
        font-size: 28px !important;
        letter-spacing: 3px !important;
    }

    .partner-desc {
        font-size: 15px !important;
    }

    .partner-logos {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

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

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

.section-header h2 {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 10px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-light);
    margin-top: 20px;
}

/* ==================== 公司介绍版块 ==================== */
.about-section {
    background: var(--light-bg);
}

/* 顶部4个特性图标横排 */
.about-features-row {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.about-features-row .feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    background: var(--white);
    border-radius: var(--border-radius);
    transition: var(--transition);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.about-features-row .feature-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.about-features-row .feature-icon {
    font-size: 30px;
}

.about-features-row .feature-text {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    white-space: nowrap;
}

/* 中间内容区：左文字 + 右媒体 */
.about-main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

/* 左侧文字 */
.about-text-col p {
    font-size: 15px;
    line-height: 1.9;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-align: justify;
}

/* 数据墙横排 */
.stats-row {
    display: flex;
    gap: 20px;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid #ddd;
}

.stat-box {
    flex: 1;
    text-align: center;
    padding: 20px 10px;
    background: var(--primary-color);
    border-radius: var(--border-radius);
    color: var(--white);
}

.stat-number {
    margin-bottom: 6px;
}

.stat-number .num {
    font-size: 36px;
    font-weight: bold;
}

.stat-number .unit {
    font-size: 16px;
    opacity: 0.85;
}

.stat-box .stat-label {
    font-size: 13px;
    opacity: 0.8;
    display: block;
}

/* 右侧媒体：视频+图片 */
.about-media-col {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.video-wrapper {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.video-wrapper video {
    width: 100%;
    display: block;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.about-images-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.about-images-row img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.about-images-row img:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow);
}

/* 响应式 - 平板 */
@media (max-width: 992px) {
    .about-main-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-features-row {
        gap: 15px;
    }
    
    .about-features-row .feature-item {
        padding: 12px 18px;
    }
}

/* 响应式 - 手机 */
@media (max-width: 768px) {
    .about-features-row {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .about-features-row .feature-item {
        width: 100%;
        justify-content: center;
    }
    
    .stats-row {
        flex-direction: column;
        gap: 12px;
    }
    
    .stat-number .num {
        font-size: 28px;
    }
    
    .about-images-row img {
        height: 130px;
    }
}

/* ==================== 业务范围 ==================== */
.services-section {
    background: var(--light-bg);
}

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

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.service-img {
    width: 100%;
    height: 180px;
    overflow: hidden;
}

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

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

.service-content {
    padding: 25px 20px;
    text-align: center;
}

.service-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.service-card h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.service-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

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

/* 特色项目 - 顶部大卡片 */
.featured-case {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 60px;
}

.featured-img {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.featured-img img {
    width: 100%;
    height: 320px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

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

.featured-info {
    padding: 10px 0;
}

.featured-tag {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    font-size: 12px;
    font-weight: 500;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 15px;
}

.featured-info h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 15px;
    line-height: 1.4;
}

.featured-info p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
    text-align: justify;
}

/* 项目网格 - 2行4列 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.case-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.case-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    transition: var(--transition);
}

.case-card:hover img {
    transform: scale(1.08);
}

.case-info {
    padding: 15px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.case-info h3 {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.case-info p {
    font-size: 12px;
    color: var(--text-light);
    line-height: 1.7;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 经典项目案例 - 蓝色底 */
.classic-cases {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--border-radius);
    padding: 40px;
    margin-bottom: 40px;
}

.classic-cases h3 {
    font-size: 22px;
    color: var(--white);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.classic-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px 30px;
}

.classic-item {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.85);
    padding: 8px 0;
    padding-left: 18px;
    position: relative;
    line-height: 1.6;
}

.classic-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-color);
}

/* 结语 */
.cases-summary {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.cases-summary p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ==================== 产品服务 ==================== */
.products-section {
    background: linear-gradient(135deg, var(--dark-bg) 0%, #16213e 100%);
    color: var(--white);
}

.products-section .section-header h2 {
    color: var(--white);
}

.products-section .section-header h2::after {
    background: var(--accent-color);
}

.products-section .section-header p {
    color: rgba(255, 255, 255, 0.7);
}

.products-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.product-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 35px;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.product-item h3 {
    font-size: 20px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.product-item ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.product-item li {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.85);
    padding-left: 20px;
    position: relative;
}

.product-item li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* ==================== 资质荣誉 ==================== */
.quality-section {
    background: var(--light-bg);
}

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

.quality-item {
    background: var(--white);
    padding: 40px 25px;
    text-align: center;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.quality-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.quality-item h3 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.quality-item p {
    font-size: 14px;
    color: var(--text-light);
}

/* 资质证书图片展示 */
.quality-gallery {
    margin-top: 60px;
}

.gallery-title {
    text-align: center;
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.gallery-single {
    text-align: center;
}

.gallery-single img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

/* ==================== 售后服务 ==================== */
.service-after {
    background: var(--white);
}

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

.service-after-item {
    display: flex;
    gap: 20px;
    padding: 25px;
    background: var(--light-bg);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.service-after-item:hover {
    background: var(--white);
    box-shadow: var(--shadow);
}

.service-after-item .num {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.3;
}

.service-after-item .info h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.service-after-item .info p {
    font-size: 13px;
    color: var(--text-light);
}

/* ==================== 联系我们 ==================== */
.contact-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
}

.contact-section .section-header h2 {
    color: var(--white);
}

.contact-section .section-header h2::after {
    background: var(--white);
}

.contact-section .section-header p {
    color: rgba(255, 255, 255, 0.8);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-item .icon {
    font-size: 32px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 16px;
    margin-bottom: 5px;
}

.contact-item p {
    font-size: 14px;
    opacity: 0.9;
}

.contact-form {
    background: rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.contact-form h3 {
    font-size: 22px;
    margin-bottom: 25px;
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.contact-form input,
.contact-form textarea {
    padding: 15px 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    font-size: 14px;
    transition: var(--transition);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--white);
    background: rgba(255, 255, 255, 0.15);
}

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

.contact-form .btn-primary {
    background: var(--white);
    color: var(--primary-color);
    border: none;
    padding: 15px 40px;
    font-size: 16px;
    font-weight: 600;
}

.contact-form .btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--dark-bg);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand img {
    height: 50px;
    margin-bottom: 15px;
    filter: brightness(0) invert(1); /* 变白色 */
}

.footer-brand p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 8px;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

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

.footer-contact p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 8px;
}

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

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 5px;
}

.footer-icp a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
}

.footer-icp a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* ==================== 内页通用样式 ==================== */

/* 页面Banner */
.page-banner {
    position: relative;
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 80px;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('image/首屏海报01.jpg') center/cover no-repeat;
    z-index: -2;
}

.page-banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 68, 153, 0.85) 0%, rgba(26, 26, 46, 0.8) 100%);
    z-index: -1;
}

.page-banner-content {
    text-align: center;
    color: var(--white);
    padding: 20px;
}

.page-banner-content h1 {
    font-size: 42px;
    font-weight: bold;
    letter-spacing: 6px;
    margin-bottom: 10px;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
}

.page-banner-content p {
    font-size: 16px;
    letter-spacing: 4px;
    opacity: 0.8;
    margin-bottom: 20px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 14px;
    opacity: 0.7;
}

.breadcrumb a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--accent-color);
}

/* 导航active状态 */
.nav a.active {
    color: var(--primary-color) !important;
}

.nav a.active::after {
    width: 100% !important;
}

/* 核心数据横幅（白底） */
.stats-banner-section {
    background: var(--white);
}

.about-page-stats {
    gap: 15px;
    padding: 0;
    border: none;
    margin-top: 0;
}

.about-page-stats .stat-box {
    background: var(--light-bg);
    color: var(--text-dark);
    border-radius: var(--border-radius);
}

.about-page-stats .stat-number .num,
.about-page-stats .stat-number .unit {
    color: var(--primary-color);
}

.about-page-stats .stat-label {
    color: var(--text-light);
}

/* 企业优势网格 */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.advantage-card {
    padding: 35px 30px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.advantage-num {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.12;
    position: absolute;
    top: 15px;
    right: 20px;
    line-height: 1;
}

.advantage-card h3 {
    font-size: 20px;
    color: var(--text-dark);
    margin-bottom: 12px;
    position: relative;
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* 企业文化网格 */
.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.culture-card {
    text-align: center;
    padding: 45px 30px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.culture-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.culture-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.culture-card h3 {
    font-size: 20px;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.culture-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* CTA区块 */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.cta-section .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.3);
}

/* 服务卡片"了解详情"链接 */
.btn-link {
    display: inline-block;
    margin-top: 12px;
    color: var(--primary-color);
    font-size: 14px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.btn-link:hover {
    color: var(--secondary-color);
    transform: translateX(3px);
}

/* 服务流程5列响应式 */
@media (max-width: 1200px) {
    .advantage-grid[style*="repeat(5"] {
        grid-template-columns: repeat(3, 1fr) !important;
    }
}

@media (max-width: 768px) {
    .advantage-grid[style*="repeat(5"] {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media (max-width: 480px) {
    .advantage-grid[style*="repeat(5"] {
        grid-template-columns: 1fr !important;
    }
}

/* 服务详情页通用 */
.service-detail-section {
    padding: 80px 0;
}

.service-detail-section .detail-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    margin-bottom: 60px;
}

.service-detail-section .detail-intro img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

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

.service-detail-section .detail-intro p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.9;
    text-align: justify;
    margin-bottom: 15px;
}

/* 应用场景 */
.scene-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.scene-card {
    text-align: center;
    padding: 35px 20px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.scene-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.scene-icon {
    font-size: 42px;
    margin-bottom: 15px;
}

.scene-card h4 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.scene-card p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
}

/* 技术特点 */
.feature-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.feature-list-item {
    display: flex;
    gap: 15px;
    padding: 25px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-list-item:hover {
    transform: translateY(-3px);
}

.feature-list-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.feature-list-item h4 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.feature-list-item p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.7;
}

/* 新闻列表 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

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

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.news-card-img {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

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

.news-card-body {
    padding: 25px 20px;
}

.news-card-date {
    font-size: 13px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.news-card-body h3 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 10px;
    line-height: 1.5;
}

.news-card-body p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==================== 响应式：内页 ==================== */
@media (max-width: 1024px) {
    .advantage-grid {
        grid-template-columns: 1fr 1fr;
    }
    .culture-grid {
        grid-template-columns: 1fr 1fr;
    }
    .scene-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .feature-list {
        grid-template-columns: 1fr;
    }
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-page-stats {
        gap: 10px;
    }
}

@media (max-width: 768px) {
    .page-banner {
        height: 250px;
        margin-top: 70px;
    }
    .page-banner-content h1 {
        font-size: 28px;
        letter-spacing: 3px;
    }
    .advantage-grid {
        grid-template-columns: 1fr;
    }
    .culture-grid {
        grid-template-columns: 1fr;
    }
    .scene-grid {
        grid-template-columns: 1fr 1fr;
    }
    .service-detail-section .detail-intro {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    .about-page-stats {
        flex-wrap: wrap;
    }
    .about-page-stats .stat-box {
        min-width: calc(50% - 8px);
    }
    .news-grid {
        grid-template-columns: 1fr;
    }
    .feature-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .page-banner {
        height: 220px;
    }
    .page-banner-content h1 {
        font-size: 24px;
    }
    .scene-grid {
        grid-template-columns: 1fr;
    }
}

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

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

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

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

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

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

@media (max-width: 768px) {
    .header-inner {
        height: 70px;
    }

    .logo span {
        display: none;
    }

    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 20px;
        box-shadow: var(--shadow);
        display: none;
    }

    .nav.active {
        display: block;
    }

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

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

    .hero-content h1 {
        font-size: 36px;
        letter-spacing: 4px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .btn {
        padding: 10px 25px;
        font-size: 14px;
    }

    .btn-outline {
        margin-left: 0;
        margin-top: 15px;
    }

    .section {
        padding: 60px 0;
    }

    .section-header h2 {
        font-size: 28px;
    }

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

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

    .featured-case {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .featured-img img {
        height: 220px;
    }

    .featured-info h3 {
        font-size: 20px;
    }

    .classic-list {
        grid-template-columns: 1fr;
    }

    .classic-cases {
        padding: 25px;
    }

    .case-card img {
        height: 160px;
    }

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

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

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

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand img {
        margin: 0 auto 15px;
    }
}

/* 移动端菜单显示 */
.nav ul.show {
    display: flex;
}

/* 导航栏active状态 */
.nav.active {
    display: block;
}