* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --dark: #1e293b;
    --gray: #64748b;
    --light: #f1f5f9;
    --white: #ffffff;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--dark);
    line-height: 1.6;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
.section {
    padding: 80px 0;
}
.bg-light {
    background: var(--light);
}
.bg-dark {
    background: var(--dark);
    color: var(--white);
}
.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-header h2 {
    font-size: 32px;
    margin-bottom: 12px;
}
.section-header p {
    color: var(--gray);
    font-size: 16px;
}

/* 导航 */
.navbar {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    background: #fff;
    z-index: 999;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    /* 把上下 padding 从 20px 改成 12px，压缩导航栏高度 */
    padding: 12px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: 30px;
}

/* 2. logo调整：增加上下边距，避免贴死 */
.logo {
    width: 140px;
    height: auto;
    display: block;
    object-fit: contain;
    /* 去掉 logo 的上下 margin，避免额外拉高 */
    margin: 0;
}

/* 3. 菜单文字和按钮同步优化，避免失衡 */
.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-links a {
    font-size: 18px;
    font-weight: 500;
    color: var(--dark);
    text-decoration: none;
    transition: color 0.3s;
}

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

.nav-links .nav-cta {
    background: var(--primary);
    color: white !important;
    padding: 12px 28px;
    border-radius: 6px;
    font-size: 18px;
}
.nav-links .nav-cta:hover {
    background: var(--primary-dark);
}
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--dark);
}

/* 首页轮播图样式（背景图模式） */
.hero-carousel-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.hero-carousel-track {
    display: flex;
    height: 100%;
    transition: transform 0.8s ease;
}

.hero-slide {
    min-width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 100%);
    z-index: 1;
}

.hero-carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.2);
    color: #fff;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 22px;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 10;
    backdrop-filter: blur(4px);
}

.hero-carousel-btn:hover {
    background: rgba(255,255,255,0.4);
}

.hero-prev {
    left: 40px;
}

.hero-next {
    right: 40px;
}

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

.hero-carousel-dots .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: all 0.3s;
}

.hero-carousel-dots .dot.active {
    background: #fff;
    transform: scale(1.2);
}

/* Hero */
.hero {
    position: relative;
    padding: 160px 0 100px;
    text-align: center;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero .hero-content {
    position: relative;
    z-index: 5;
}
.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: #fff;
    font-weight: 700;
    line-height: 1.3;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.hero-content h1 span {
    color: #fbbf24;
}
.hero-content > p {
    font-size: 20px;
    color: rgba(255,255,255,0.9);
    margin-bottom: 36px;
    text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}
.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
}
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}
.btn-primary {
    background: var(--primary);
    color: var(--white);
}
.btn-primary:hover {
    background: var(--primary-dark);
}
.btn-outline {
    border: 2px solid var(--dark);
    color: var(--dark);
}
.btn-outline:hover {
    background: var(--dark);
    color: var(--white);
}

/* 数据统计 */
.stats {
    background: var(--primary);
    padding: 40px 0;
}
.stats-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
    text-align: center;
    color: var(--white);
}
.stat-item {
    display: flex;
    flex-direction: column;
}
.stat-num {
    font-size: 36px;
    font-weight: 700;
}
.stat-label {
    font-size: 14px;
    opacity: 0.9;
}

/* 关于我们 */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-text p {
    margin-bottom: 20px;
    color: var(--gray);
}
.about-features {
    margin-top: 24px;
}
.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
}
.feature-icon {
    width: 24px;
    height: 24px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}
.about-image .image-placeholder {
    background: linear-gradient(135deg, var(--light) 0%, #cbd5e1 100%);
    border-radius: 12px;
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--gray);
}

/* 服务 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.service-card {
    background: var(--white);
    padding: 32px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.3s, box-shadow 0.3s;
}
.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.service-icon {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}
.service-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
}
.service-card p {
    color: var(--gray);
    font-size: 14px;
}

/* 服务流程 */
.process-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}
.process-item {
    text-align: center;
}
.process-num {
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 12px;
}
.process-item h4 {
    font-size: 16px;
    margin-bottom: 4px;
}
.process-item p {
    font-size: 13px;
    color: var(--gray);
}
.process-line {
    width: 40px;
    height: 2px;
    background: #cbd5e1;
}

/* 案例 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.case-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.3s;
}
.case-card:hover {
    transform: translateY(-4px);
}
.case-info h4 {
    font-size: 16px;
    margin-bottom: 8px;
}
.case-info p {
    font-size: 13px;
    color: var(--gray);
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    padding: 24px;
    background: var(--white);
    border-radius: 12px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.faq-item h4 {
    color: var(--primary);
    margin-bottom: 12px;
}
.faq-item p {
    color: var(--gray);
}

/* 联系 */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}
.contact-info h2 {
    font-size: 28px;
    margin-bottom: 8px;
}
.contact-info > p {
    color: #94a3b8;
    margin-bottom: 32px;
}
.contact-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.contact-item {
    display: flex;
    gap: 16px;
}
.contact-label {
    color: #94a3b8;
    min-width: 50px;
}
.contact-form {
    background: rgba(255,255,255,0.1);
    padding: 32px;
    border-radius: 12px;
}
.contact-form h3 {
    margin-bottom: 24px;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    background: rgba(255,255,255,0.1);
    color: var(--white);
    margin-bottom: 16px;
    font-size: 14px;
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: #94a3b8;
}
.contact-form select option {
    color: var(--dark);
    background: var(--white);
}
.btn-submit {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s;
}
.btn-submit:hover {
    background: var(--primary-dark);
}

/* 页脚 */
.footer-top {
    padding: 48px 0 32px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}
.footer-brand h4,
.footer-links h4,
.footer-contact h4,
.footer-area h4 {
    margin-bottom: 16px;
}
.footer-brand p {
    color: #94a3b8;
    font-size: 14px;
}
.footer-links a {
    display: block;
    color: #94a3b8;
    text-decoration: none;
    padding: 6px 0;
    font-size: 14px;
    transition: color 0.3s;
}
.footer-links a:hover {
    color: var(--white);
}
.footer-contact p,
.footer-area p {
    color: #94a3b8;
    font-size: 14px;
    padding: 4px 0;
}
.footer-bottom {
    padding: 20px 0;
    text-align: center;
}
.footer-bottom p {
    color: #64748b;
    font-size: 13px;
}
.footer-bottom a {
    color: #94a3b8;
    text-decoration: none;
}
/* 下拉菜单容器 */
.dropdown {
    position: relative;
    display: inline-block;
}

/* 下拉菜单按钮（服务文字） */
.dropdown-toggle {
    font-size: 18px;
    font-weight: 500;
    color: var(--dark);
    text-decoration: none;
    transition: color 0.3s;
}
.dropdown-toggle:hover {
    color: var(--primary);
}

/* 下拉菜单默认隐藏 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    min-width: 160px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 999;
}

/* 鼠标 hover 时显示下拉菜单 */
.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 下拉菜单里的选项 */
.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: var(--dark);
    text-decoration: none;
    font-size: 16px;
    transition: background 0.2s;
}
.dropdown-menu a:hover {
    background: #f5f5f5;
    color: var(--primary);
}
/* 轮播容器样式 */
.carousel-container {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-slide {
    min-width: 100%;
    padding: 32px;
    box-sizing: border-box;
}

/* 图片区：左右两张图 */
.slide-images {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.img-box {
    flex: 1;
    position: relative;
}

.img-box img {
    width: 100%;
    height: 240px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid #eee;
}

.img-label {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 4px;
}

/* 文字信息区 */
.slide-info {
    text-align: center;
}

.slide-info h4 {
    margin: 0 0 8px;
    font-size: 20px;
}

.slide-info p {
    margin: 0 0 12px;
    color: var(--gray);
    font-size: 14px;
}

.verify-link {
    display: inline-block;
    padding: 8px 20px;
    background: var(--primary);
    color: #fff;
    border-radius: 20px;
    font-size: 14px;
    text-decoration: none;
    transition: background 0.3s;
}

.verify-link:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

/* 轮播按钮 */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.5);
    color: #fff;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
}

.prev-btn {
    left: 16px;
}

.next-btn {
    right: 16px;
}

.carousel-btn:hover {
    background: rgba(0,0,0,0.8);
}
.error-tip {
    color: #f00;
    font-size:14px;
    display:none;
}
input.error {
    border:1px solid #f00;
}
.footer-brand {
    text-align: center;
}

.footer-brand h4 {
    margin-bottom: 16px;
    font-size: 18px;
    font-weight: 600;
}

.social-list {
    display: flex;
    justify-content: center;
    gap: 32px;
}

.social-item {
    position: relative;
    cursor: pointer;
}

.social-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.qr-code {
    display: flex;
    justify-content: center;
    margin-top: 12px;
    width: 100%;
    max-width: 120px;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.qr-code img {
    width: 112px;
    height: 112px;
    object-fit: contain;
}

/* 页脚二维码新样式 */
.qr-item-inline {
    text-align: center;
}

.qr-label {
    display: block;
    font-size: 13px;
    color: #94a3b8;
    margin-bottom: 8px;
}

/* 权威证书样式 */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.cert-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.3s, box-shadow 0.3s;
}

.cert-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.cert-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.cert-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--dark);
}

.cert-card p {
    font-size: 14px;
    color: var(--gray);
}

/* 案例展示页面轮播图样式 */
.cases-carousel-container {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    border-radius: 16px;
    overflow: hidden;
    background: var(--white);
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.cases-carousel-track {
    display: flex;
    transition: transform 0.6s ease;
}

.cases-carousel-slide {
    min-width: 100%;
}

.cases-media-section {
    height: 420px;
    overflow: hidden;
}

.cases-media-section img,
.cases-media-section video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cases-info-section {
    padding: 32px 40px;
    background: var(--white);
    min-height: 180px;
}

.cases-info-section h3 {
    font-size: 24px;
    color: var(--dark);
    margin-bottom: 12px;
}

.cases-info-section p {
    font-size: 16px;
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: 16px;
}

.cases-link-btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary);
    color: #fff;
    border-radius: 24px;
    text-decoration: none;
    font-size: 14px;
    transition: background 0.3s;
}

.cases-link-btn:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

.cases-carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.5);
    color: #fff;
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: background 0.3s;
    z-index: 10;
}

.cases-carousel-btn:hover {
    background: rgba(0,0,0,0.8);
}

.cases-prev-btn {
    left: 20px;
}

.cases-next-btn {
    right: 20px;
}
/* 弹窗遮罩 */
.modal-overlay {
    display: none; /* 默认隐藏 */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    z-index: 9999;
    justify-content: center;
    align-items: center;
}

/* 弹窗主体 */
.modal-content {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    position: relative;
    width: 90%;
    max-width: 400px;
}

/* 关闭按钮 */
.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 24px;
    cursor: pointer;
    color: #333;
    border: none;
    background: none;
}

/* 二维码容器 */
.qr-group {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
}

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

.qr-item img {
    width: 120px;
    height: 120px;
    border: 1px solid #eee;
    border-radius: 8px;
}

.qr-item p {
    margin-top: 8px;
    font-size: 14px;
    color: #666;
}
/* 响应式 */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        gap: 12px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .nav-links.active {
        display: flex;
    }
    .menu-toggle {
        display: flex;
    }
    .hero {
        padding: 120px 0 60px;
    }
    .hero-content h1 {
        font-size: 28px;
    }
    .stats-container {
        flex-wrap: wrap;
        gap: 24px;
    }
    .stat-item {
        flex: 1 1 40%;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .services-grid {
        grid-template-columns: 1fr;
    }
    .process-flow {
        flex-wrap: wrap;
        gap: 24px;
    }
    .process-line {
        display: none;
    }
    .cases-grid {
        grid-template-columns: 1fr;
    }
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .section {
        padding: 60px 0;
    }
}