body,
.hero-section,
#home,
main,
.main-content {
    padding-top: 0 !important;
    margin-top: 0 !important;
}

:root {
    /* ===== 主配色方案 ===== */
    --primary-dark: #112d4e;
    --primary-dark-rgb: 17, 45, 78;
    --primary-mid: #3f72af;
    --primary-light: #dbe2ef;
    --accent-blue: #3f72af;
    --accent-color-rgb: 63, 114, 175;
    --bg-light: #f9f7f7;
    --white: #ffffff;
    --white-rgb: 255, 255, 255;
    --text-dark: #112d4e;
    --text-light: #555555;
    --text-muted: #888888;
    --border-color: #c5d0e0;
    --shadow-color: rgba(17, 45, 78, 0.10);

    /* 兼容旧变量 */
    --primary-color: #112d4e;
    --secondary-color: #dbe2ef;
    --accent-color: #3f72af;
    --gradient-overlay: linear-gradient(135deg, rgba(17, 45, 78, 0.40), rgba(63, 114, 175, 0.30));
}


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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    line-height: 1.6;
    overflow-x: hidden;
    font-size: 1rem;
    color: var(--text-dark);
    padding-top: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
}

/* ============================================================
   预加载动画 (Preloader)
   ============================================================ */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-dark);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s, visibility 0.8s;
}

#preloader.loaded {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    text-align: center;
    color: var(--white);
}

.logo-text {
    display: block;
    font-size: 3rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    opacity: 0;
    animation: 1.5s forwards logoFadeIn;
}

.logo-subtitle {
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    opacity: 0;
    animation: 1s 1s forwards logoFadeIn;
}

.logo-line {
    width: 0;
    height: 2px;
    background: var(--accent-blue);
    margin: 1rem auto;
    animation: 1s 0.5s forwards lineExpand;
}

@keyframes logoFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes lineExpand {
    to {
        width: 100px;
    }
}

/* ============================================================
   导航栏 (Navbar)
   ============================================================ */
.navbar {
    padding: 1rem;
    transition: 0.4s;
    background: transparent;
}

.navbar.scrolled {
    padding: 0;
    background: rgba(var(--white-rgb), 0.96);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px var(--shadow-color);
}

.navbar-brand {
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
    color: var(--white);
}

.navbar.scrolled .navbar-brand {
    color: var(--primary-dark);
}

.brand-text {
    display: block;
    font-size: 1.5rem;
    letter-spacing: 0.1em;
    line-height: 1;
}

.brand-subtitle {
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    opacity: 0.8;
}

/* 导航链接基础样式（顶部透明时） */
.navbar-nav .nav-link {
    font-weight: 500;
    margin: 1.4rem 0.4rem !important;
    position: relative;
    border-radius: 0 !important;
    overflow: hidden;
    transition: color 0.35s ease;
    margin-top: -1rem;
    margin-bottom: -1rem;
    padding: 1rem 1rem;
    display: flex;
    align-items: center;
    font-size: 0.9375rem;
    color: var(--white);
}

/* 滚动后导航链接 */
.navbar.scrolled .navbar-nav .nav-link {
    color: var(--text-dark);
    margin: 0 !important;
    padding: 1.9rem 1rem !important;
    line-height: 1.2;
    display: flex;
    align-items: center;
    height: 100%;
    margin-left: 0.4rem !important;
    margin-right: 0.4rem !important;
}

/* 透明导航栏 - 底部横线效果 */
.navbar:not(.scrolled) .navbar-nav .nav-link::after {
    display: block !important;
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), var(--accent-blue), transparent);
    transform: scaleX(0);
    transition: transform 0.4s ease;
    transform-origin: center;
}

.navbar:not(.scrolled) .navbar-nav .dropdown>.nav-link::after {
    display: none !important;
}

.navbar:not(.scrolled) .navbar-nav .nav-link:hover::after {
    transform: scaleX(1);
}



.navbar:not(.scrolled) .navbar-nav .nav-link {
    margin-left: 0 !important;
    margin-right: 0 !important;
}
.navbar.scrolled .navbar-nav .nav-link {
    margin-left: 0 !important;
    margin-right: 0 !important;
}




.navbar:not(.scrolled) .navbar-nav .nav-link:hover {
    color: var(--white) !important;
    background-color: transparent !important;
}

.navbar.scrolled .navbar-nav .nav-link::after {
    display: none !important;
}

.navbar.scrolled .navbar-nav .nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 100%;
    height: 0;
    background-color: var(--accent-blue);
    transition: height 0.35s ease;
    z-index: -1;
    border-radius: 0 !important;
}

.navbar.scrolled .navbar-nav .nav-link:hover::before {
    height: 100%;
}

.navbar.scrolled .navbar-nav .nav-link:hover {
    color: var(--white) !important;
}

/* 下拉菜单 */
.navbar .dropdown-toggle::after {
    display: none !important;
}

.dropdown-menu {
    background: rgba(var(--white-rgb), 0.92);
    border-radius: 0 0 0px 0px;
    border: none;
    box-shadow: 0 10px 30px rgba(35, 59, 110, 0.12);
    padding: 0;                 /* 原为 0.25rem 0，改为 0 消除上下留白 */
    margin-top: 0;
}

.dropdown-item {
    padding: 0.9rem 1.5rem;    /* 上下内边距加大，菜单项变高，且不留白 */
    transition: all 0.3s ease;
    border-radius: 0;
}

.dropdown-item:hover {
    background-color: var(--accent-blue);
    color: var(--white);
}

/* 桌面端 hover 展开二级菜单 */
@media (min-width: 992px) {
    .navbar-nav .dropdown:hover>.dropdown-menu {
        display: block;
        margin-top: 0;
    }
}

/* 汉堡菜单图标 */
.navbar-toggler {
    position: relative;
    width: 30px;
    height: 20px;
    border: none;
    background: transparent !important;
    padding: 0;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler-icon {
    background-image: none !important;
    position: relative;
    height: 2px;
    width: 100%;
    background-color: var(--white);
    transition: 0.3s;
}

.navbar.scrolled .navbar-toggler-icon {
    background-color: var(--primary-dark);
}

.navbar-toggler-icon::after,
.navbar-toggler-icon::before {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: inherit;
    transition: 0.3s;
}

.navbar-toggler-icon::before {
    top: -8px;
}
.navbar-toggler-icon::after {
    bottom: -8px;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
    background-color: transparent;
}
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::before {
    transform: rotate(45deg);
    top: 0;
}
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::after {
    transform: rotate(-45deg);
    bottom: 0;
}

/* LOGO 图片 */
.navbar-logo {
    height: 55px;
    width: auto;
    display: block;
    transition: all 0.3s ease;
}

.navbar.scrolled .navbar-logo {
    content: url('/images/logo.png');
}

/* 移动端侧边栏 */
.offcanvas {
    background: var(--primary-dark);
    color: var(--white);
    z-index: 99999999 !important;
}

.offcanvas-body .nav-link {
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    padding: 0.75rem 1rem !important;
}

.offcanvas .nav-link {
    color: var(--white);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

/* 移动端侧边栏适配 */
@media (max-width: 991.98px) {
    .dropdown-menu {
        background: transparent;
        box-shadow: none;
        border: none;
        padding-left: 1rem;
    }
    .dropdown-item {
        color: var(--white);
        padding: 0.6rem 1rem;
    }
    .dropdown-item:hover {
        background: rgba(var(--accent-color-rgb), 0.20);
        color: var(--white);
    }
    .navbar-nav .nav-link {
        color: var(--white) !important;
        margin: 0;
        padding: 0.75rem 0;
    }
    .navbar.scrolled {
        background-color: transparent !important;
        box-shadow: none !important;
    }
    .offcanvas.offcanvas-end {
        width: 300px;
    }
    body.offcanvas-open {
        overflow: hidden;
    }

    .navbar>.container {
        flex-wrap: nowrap;
    }
    .navbar-brand {
        flex: 1 1 auto;
        min-width: 0;
        overflow: visible;
    }
    .navbar-brand img {
        max-height: 40px;
        width: auto;
        display: block;
    }
    .navbar-toggler {
        flex-shrink: 0;
        margin-left: auto;
    }
}

/* ============================================================
   Hero 区域 / 轮播
   ============================================================ */
.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    position: relative;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('/images/banner.jpg') center/cover no-repeat;
    z-index: -2;
    will-change: transform;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-overlay);
    z-index: -1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 1.5rem;
    line-height: 1.2;
    max-width: 100%;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    max-width: 600px;
    line-height: 1.6;
}

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

.accent-text {
    color: var(--accent-blue);
    position: relative;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: 2s infinite bounce;
}

.scroll-arrow {
    width: 2px;
    height: 40px;
    background: var(--white);
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -4px;
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--white);
    border-bottom: 2px solid var(--white);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* 轮播内元素调整 */
#heroCarousel,
#heroCarousel .carousel-inner,
#heroCarousel .carousel-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#heroCarousel .carousel-item {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

#heroCarousel .container {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    align-items: center;
}

#heroCarousel .hero-title {
    white-space: normal;
    max-width: 100% !important;
}

#heroCarousel .hero-subtitle {
    max-width: 100% !important;
}

.carousel-control-prev,
.carousel-control-next,
.carousel-indicators {
    z-index: 3;
}

/* ============================================================
   通用按钮
   ============================================================ */
.btn {
    padding: 0.875rem 2rem;
    font-weight: 500;
    border-radius: 0;
    border: 2px solid transparent;
    display: inline-block;
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: 0.3s;
    text-transform: uppercase;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
    border-width: 1px;
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

/* 辅助按钮色 - 浅色背景使用 */
.btn-outline-primary {
    background: transparent;
    color: var(--primary-mid);
    border-color: var(--primary-mid);
}

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

.btn-outline-blue {
    background: transparent;
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

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

/* ============================================================
   通用区块
   ============================================================ */
.section-padding {
    padding: 6rem 0;
}

.section-header {
    margin-bottom: 4rem;
}

.section-header .section-subtitle {
    margin-bottom: 1rem !important;
    display: block;
    color: var(--accent-blue);
    font-weight: 600;
    letter-spacing: 0.05em;
}

.section-header .section-title {
    color: var(--primary-dark);
    font-weight: 700;
}

.section-description {
    color: var(--text-light);
}

.bg-light {
    background: var(--bg-light);
}
.bg-primary-light {
    background: var(--primary-light);
}
.bg-dark {
    background: var(--gradient-overlay);
}

/* ============================================================
   简介区块 (About)
   ============================================================ */
#about .section-subtitle {
    color: var(--accent-blue);
    font-weight: 600;
}
#about .section-title {
    color: var(--primary-dark);
    font-weight: 700;
}
#about p {
    color: var(--text-light);
    line-height: 1.8;
}
#about .stat-item h3 {
    color: var(--accent-blue);
    font-weight: 700;
}
#about .stat-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
}
#about .about-image img {
    border-radius: 0 !important;
}

.about-image {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
}
.about-image img {
    transition: transform 0.6s;
}
.about-image:hover img {
    transform: scale(1.05);
}

.stats-row {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}
.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
}
.stat-item p {
    color: var(--text-light);
    margin: 0;
}

/* ============================================================
   服务卡片 / 入口卡片
   ============================================================ */
.service-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 0;
    text-align: center;
    height: 100%;
    transition: 0.3s;
    border: 1px solid rgba(var(--accent-color-rgb), 0.06);
}
.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--shadow-color);
}
.service-icon {
    margin: 0 auto 1.5rem;
    overflow: hidden;
}
.service-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-dark);
}

.detail-system-card {
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.detail-system-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px rgba(var(--accent-color-rgb), 0.12);
}
.detail-system-card:hover img {
    transform: scale(1.00);
    transition: transform 0.6s ease;
}

/* ============================================================
   流程步骤
   ============================================================ */
.process-step {
    text-align: center;
    color: var(--white);
    padding: 2rem 1rem;
}
.step-number {
    font-family: 'Playfair Display', serif;
    font-size: 3rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 1rem;
    position: relative;
}
.step-number::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: var(--accent-blue);
}
.process-step h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--white);
}
.process-step p {
    color: rgba(255, 255, 255, 0.8);
}

/* ============================================================
   案例筛选 / 作品集
   ============================================================ */
.portfolio-filter {
    margin-bottom: 3rem;
}
.filter-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-light);
    padding: 0.75rem 1.5rem;
    margin: 0 0.5rem 0.5rem 0;
    border-radius: 0;
    font-weight: 500;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: 0.3s;
}
.filter-btn.active,
.filter-btn:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: var(--white);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}
.portfolio-card {
    position: relative;
    overflow: hidden;
    border-radius: 0px;
    height: 250px;
}
.portfolio-image {
    position: relative;
    height: 100%;
    overflow: hidden;
}
.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s;
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(var(--primary-dark-rgb), 0.88);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.4s;
}
.portfolio-card:hover .portfolio-overlay {
    opacity: 1;
}
.portfolio-card:hover .portfolio-image img {
    transform: scale(1.1);
}

.portfolio-content {
    text-align: center;
    color: var(--white);
    transform: translateY(20px);
    transition: transform 0.4s;
}
.portfolio-card:hover .portfolio-content {
    transform: translateY(0);
}
.portfolio-content h4 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}
.portfolio-content p {
    color: var(--accent-blue);
    margin-bottom: 1rem;
    font-weight: 500;
}
.portfolio-link {
    color: var(--white);
    text-decoration: none;
    border-bottom: 2px solid var(--accent-blue);
    padding-bottom: 2px;
    transition: 0.3s;
}
.portfolio-link:hover {
    color: var(--accent-blue);
}

/* ============================================================
   博客卡片
   ============================================================ */
.blog-card {
    height: 100%;
    transition: transform 0.3s;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    background: var(--white);
    border-radius: 0;
    overflow: hidden;
}
.blog-card:hover {
    transform: translateY(-5px);
}
.blog-image {
    height: 250px;
    overflow: hidden;
}
.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s;
}
.blog-card:hover .blog-image img {
    transform: scale(1.05);
}
.blog-content {
    padding: 2rem;
}
.blog-content h3 {
    font-size: 1.125rem;
    line-height: 1.4;
    margin-bottom: 1rem;
    color: var(--primary-dark);
}
.blog-content p {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
}
.blog-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.75rem;
}
.blog-date,
.blog-category {
    font-size: 0.75rem;
    color: var(--text-light);
    font-weight: 500;
}
.blog-link {
    color: var(--accent-blue);
    text-decoration: none;
    border-bottom: 2px solid var(--accent-blue);
    padding-bottom: 2px;
    transition: 0.3s;
    font-size: 0.8125rem;
    font-weight: 500;
}
.blog-link:hover {
    color: var(--primary-dark);
    border-color: var(--primary-dark);
}

/* ============================================================
   页脚
   ============================================================ */
.footer {
    padding: 4rem 0 2rem;
    color: var(--white);
    font-size: 0.875rem;
    background: var(--primary-dark);
}
.footer-logo {
    height: 50px;
    width: auto;
    margin-bottom: 1rem;
}
.footer-description {
    color: rgba(255, 255, 255, 0.70);
    max-width: 100%;
    margin-bottom: 1.5rem;
}
.footer h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--white);
}
.footer-links {
    list-style: none;
    padding: 0;
}
.footer-links li {
    margin-bottom: 0.5rem;
}
.footer-links li a {
    color: rgba(255, 255, 255, 0.60);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.8125rem;
}
.footer-links li a:hover {
    color: var(--accent-blue);
}
.footer-divider {
    border-color: rgba(255, 255, 255, 0.08);
    margin: 2rem 0 1.5rem;
}
.footer-copyright {
    color: rgba(255, 255, 255, 0.45);
    margin: 0;
    font-size: 0.75rem;
}

/* Footer 移动端折叠样式 */
@media (max-width: 767.98px) {
    .footer-toggle {
        cursor: pointer;
        user-select: none;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.5rem 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        margin-bottom: 0;
    }
    .footer-toggle:hover {
        color: var(--accent-blue);
    }
    .toggle-icon {
        font-size: 1.2rem;
        transition: transform 0.3s;
    }
    .footer-toggle[aria-expanded="true"] .toggle-icon {
        transform: rotate(45deg);
    }
    .collapse:not(.show) {
        display: none;
    }

    .footer-collapse-item {
        margin-bottom: 0.25rem !important;
    }
    .footer-toggle {
        cursor: pointer;
        user-select: none;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.6rem 0;
        margin-bottom: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.07);
        color: var(--white);
        font-size: 1rem;
        font-weight: 600;
        transition: color 0.3s;
    }
    .footer-toggle:hover {
        color: var(--accent-blue);
    }
    .toggle-icon {
        font-size: 1.4rem;
        font-weight: 300;
        line-height: 1;
        color: rgba(255, 255, 255, 0.4);
        transition: transform 0.3s ease;
    }
    .toggle-icon::before {
        content: '+';
        display: inline-block;
        transition: transform 0.3s ease;
    }
    .footer-toggle[aria-expanded="true"] .toggle-icon::before {
        content: '−';
    }
    .footer-links.collapse {
        transition: height 0.3s ease;
    }
    .footer-links.collapse:not(.show) {
        display: none;
    }
    .footer-links.collapse.show {
        display: block;
    }
    .footer-links {
        padding-top: 0.5rem;
        padding-bottom: 0.25rem;
    }
    .footer-links li {
        margin-bottom: 0.3rem;
    }
    .footer-links li a {
        font-size: 0.9rem;
        padding: 0.2rem 0;
        display: inline-block;
    }
}

/* 桌面端 Footer */
@media (min-width: 768px) {
    .footer-toggle {
        cursor: default;
        pointer-events: none;
        border-bottom: none;
        padding: 0 0 0.75rem 0;
        display: block;
        color: var(--white);
        font-size: 1rem;
        font-weight: 600;
    }
    .toggle-icon {
        display: none;
    }
    .footer-links.collapse {
        display: block !important;
        height: auto !important;
        visibility: visible !important;
        overflow: visible !important;
    }
    .footer-links li {
        margin-bottom: 0.5rem;
    }
}

/* ============================================================
   滚动到顶部 / 微信 / 资质等
   ============================================================ */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-blue);
    border: none;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: 0.3s;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(var(--accent-color-rgb), 0.35);
    color: var(--white);
}
.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
}
.scroll-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

.wechat-float {
    position: fixed;
    bottom: 100px;
    right: 30px;
    z-index: 999;
}
.wechat-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #07C160, #06AD56);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(7, 193, 96, 0.4);
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}
.wechat-icon:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(7, 193, 96, 0.5);
}
.wechat-popup {
    position: absolute;
    bottom: 65px;
    right: 0;
    width: 220px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    overflow: hidden;
}
.wechat-float:hover .wechat-popup {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.wechat-popup-header {
    background: linear-gradient(135deg, #07C160, #06AD56);
    color: var(--white);
    text-align: center;
    padding: 12px;
    font-size: 0.95rem;
    font-weight: 500;
}
.wechat-popup-body {
    padding: 20px;
    text-align: center;
}
.wechat-popup-body img {
    width: 160px;
    height: 160px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 10px;
}
.wechat-popup-body p {
    margin: 5px 0;
    color: var(--text-dark);
    font-size: 0.85rem;
}
.wechat-phone {
    color: #07C160 !important;
    font-weight: 600;
    font-size: 0.9rem !important;
}

.qualification-card {
    text-align: center;
    padding: 2rem 1.5rem;
}
.qualification-image {
    width: 100%;
    height: 280px;
    margin-bottom: 1.5rem;
    overflow: hidden;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
}
.qualification-image img {
    width: auto;
    height: 100%;
    max-width: 100%;
    object-fit: contain;
    transition: transform 0.4s ease;
}
.qualification-card:hover .qualification-image img {
    transform: scale(1.05);
}
.qualification-card h5 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.75rem;
}
.qualification-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

/* 证书滚动 */
.qualification-scroll-container {
    width: 100%;
    max-width: 1320px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
    margin-top: 2rem;
    padding: 0 15px;
}
@media (min-width: 1200px) {
    .qualification-scroll-container {
        max-width: 1140px;
    }
}
@media (min-width: 1400px) {
    .qualification-scroll-container {
        max-width: 1320px;
    }
}
.qualification-scroll-wrapper {
    overflow: hidden;
    width: 100%;
}
.qualification-scroll-track {
    display: flex;
    gap: 0;
    width: fit-content;
    animation: scrollQualification 20s linear infinite;
}
@keyframes scrollQualification {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}
.qualification-scroll-container:hover .qualification-scroll-track {
    animation-play-state: paused;
}
.qualification-scroll-item {
    flex: 0 0 auto;
    width: 280px;
    padding: 0 12px;
}
.qualification-scroll-item .qualification-card {
    margin: 0;
    height: 100%;
    background: var(--white);
    border-radius: 0;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.qualification-scroll-item .qualification-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

/* ============================================================
   分页
   ============================================================ */
.pagination-wrapper {
    margin-top: 3rem;
}
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
    flex-wrap: wrap;
}
.pagination .page-link {
    color: var(--text-dark);
    border: 1px solid var(--border-color);
    padding: 0.65rem 1.1rem;
    border-radius: 0;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    text-decoration: none;
}
.pagination .page-link:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: var(--white);
}
.pagination .page-item.active .page-link {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: var(--white);
}

/* ============================================================
   其他辅助
   ============================================================ */
.contact-card-sm {
    padding: 1.5rem 1.5rem;
}
.contact-card-icon-sm {
    width: 45px;
    height: 45px;
    margin-bottom: 0.8rem;
}
.contact-card-icon-sm svg {
    width: 20px;
    height: 20px;
}
.vent-feature-card img {
    transition: transform 0.5s ease;
}
.vent-feature-card:hover img {
    transform: scale(1.08);
}
.antiblast-feature-card {
    background: var(--white);
    border-radius: 0;
    padding: 2.5rem 2rem;
    height: 100%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    text-align: center;
}
.antiblast-feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-light);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-mid);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}

[data-aos] {
    pointer-events: none;
}
[data-aos].aos-animate {
    pointer-events: auto;
}
.loading {
    pointer-events: none;
    opacity: 0.6;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 767.98px) {
    .hero-title {
        font-size: 2.2rem;
        max-width: 100%;
    }
    .hero-subtitle {
        font-size: 1.1rem;
    }
    .section-padding {
        padding: 3rem 0;
    }
    .section-title {
        font-size: 2rem;
    }
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    .wechat-float {
        bottom: 80px;
        right: 20px;
    }
    .wechat-icon {
        width: 48px;
        height: 48px;
    }
    .wechat-popup {
        width: 200px;
    }
    .wechat-popup-body img {
        width: 100px;
        height: 100px;
    }
    .qualification-image {
        height: 240px;
    }
    .qualification-scroll-item {
        width: 260px;
        padding: 0 8px;
    }
    .qualification-image {
        height: 150px;
    }
}
@media (max-width: 575.98px) {
    .hero-title {
        font-size: 1.9rem;
    }
    .btn {
        border-radius: 0 !important;
    }
    .hero-buttons .btn:last-child {
        margin-bottom: 0;
    }
    .filter-btn {
        font-size: 0.85rem;
        padding: 0.6rem 1rem;
    }
    .qualification-scroll-item {
        width: 240px;
        padding: 0 6px;
    }
    .qualification-image {
        height: 130px;
    }
}



/* ============================================================
   统一所有下拉菜单（彻底消除圆角与留白问题）
   ============================================================ */

/* 1. 下拉菜单容器：添加 overflow:hidden 使子元素被圆角裁剪 */
.dropdown-menu,
.dropdown-submenu .dropdown-menu {
    padding: 0 !important;
    margin: 0 !important;
    background: rgba(255, 255, 255, 0.92) !important;
    border-radius: 0 0 8px 8px !important;   /* 保留底部圆角 */
    border: none !important;
    box-shadow: 0 10px 30px rgba(35, 59, 110, 0.12) !important;
    overflow: hidden !important;              /* 关键：裁剪子元素到圆角内 */
}

/* 2. 所有下拉菜单项：无内外边距，统一悬停蓝色背景 */
.dropdown-menu .dropdown-item,
.dropdown-submenu .dropdown-item {
    padding: 0.5rem 1.2rem !important;
    font-size: 0.8125rem !important;
    color: var(--text-dark) !important;
    background: transparent !important;
    transition: all 0.25s ease !important;
    border-radius: 0 !important;              /* 确保菜单项自身无圆角 */
    margin: 0 !important;
}

/* 悬停/聚焦效果（蓝色全覆盖） */
.dropdown-menu .dropdown-item:hover,
.dropdown-menu .dropdown-item:focus,
.dropdown-submenu .dropdown-item:hover,
.dropdown-submenu .dropdown-item:focus {
    background-color: var(--accent-blue) !important;
    color: #ffffff !important;
}




.navbar.scrolled .navbar-nav .nav-link {
    /* 确保链接高度和内边距稳定 */
    padding-top: 1.9rem !important;
    padding-bottom: 1.9rem !important;
    line-height: 1.2 !important;        /* 固定行高，避免波动 */
    margin: 0 !important;
    position: relative;
    overflow: hidden;                   /* 防止伪元素溢出边界 */
}

.navbar.scrolled .navbar-nav .nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;                      /* 使用100%替代0，配合transform过渡 */
    background-color: var(--accent-blue);
    transform: scaleY(0);              /* 初始隐藏 */
    transform-origin: top;          /* 从底部向上展开（或top可根据喜好） */
    transition: transform 0.35s ease;
    z-index: -1;
    border-radius: 0 !important;
}

.navbar.scrolled .navbar-nav .nav-link:hover::before {
    transform: scaleY(1);               /* 展开至全高 */
}

/* （可选）如果仍有底部1px间隙，可强制将链接的边框设为0 */
.navbar.scrolled .navbar-nav .nav-link {
    border-bottom: none !important;
    outline: none !important;
}



/* ===== 全局移除下拉菜单圆角 ===== */
.dropdown-menu,
.dropdown-submenu .dropdown-menu {
    border-radius: 0 !important;
}

/* ===== 移动端适配（≤991.98px） ===== */
@media (max-width: 991.98px) {
    /* 让所有下拉菜单在文档流中，背景统一为深色 */
    .dropdown-menu {
        position: static !important;
        float: none !important;
        width: 100% !important;
        background: var(--primary-dark) !important;   /* 与 Offcanvas 背景一致 */
        box-shadow: none !important;
        border: none !important;
        padding-left: 1rem !important;
        margin: 0 !important;
        border-radius: 0 !important;
    }

    /* 三级菜单（dropdown-submenu 下的菜单）额外缩进 + 微亮背景区分 */
    .dropdown-submenu > .dropdown-menu {
        padding-left: 1.5rem !important;
        background: rgba(255, 255, 255, 0.06) !important;
    }

    /* 所有菜单项文字为白色，内边距统一 */
    .dropdown-menu .dropdown-item {
        color: var(--white) !important;
        padding: 0.6rem 1rem !important;
    }

    /* 确保子菜单的 toggle 点击后正常显示（Bootstrap 自动添加 .show） */
    .dropdown-submenu .dropdown-menu.show {
        display: block;
    }
}

/* ===== PC端（≥992px）修复三级菜单 ===== */
@media (min-width: 992px) {
    /* 1. 让子菜单容器为相对定位，以便内部绝对定位 */
    .dropdown-submenu {
        position: relative;
    }

    /* 2. 三级菜单出现在父菜单右侧 */
    .dropdown-submenu > .dropdown-menu {
        position: absolute;
        top: 0;
        left: 100%;
        margin-top: 0;
        min-width: 200px;
        border-radius: 0 !important;        /* 确保无圆角 */
        overflow: visible !important;       /* 防止被父容器裁剪 */
        background: rgba(255,255,255,0.96);
        box-shadow: 0 10px 30px rgba(35,59,110,0.12);
    }

    /* 3. 悬停时显示三级菜单 */
    .dropdown-submenu:hover > .dropdown-menu {
        display: block;
    }

    /* 4. 确保二级菜单容器不裁剪子元素 */
    .dropdown-menu {
        overflow: visible !important;
    }
}