/* ========== 全局变量定义（统一管理样式） ========== */
:root {
    /* 颜色系统 */
    --color-primary: #0066cc;
    --color-primary-light: #0077dd;
    --color-primary-dark: #0055bb;
    --color-secondary: #333333;
    --color-white: #ffffff;
    --color-gray-100: #f5f7fa;
    --color-gray-200: #e5e9f2;
    --color-gray-300: #d8dce8;
    --color-tertiary: #f0f7ff;

    /* 文字颜色 */
    --color-text-primary: #333333;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;

    /* 间距系统 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    /* 字体大小 */
    --font-size-xs: 12px;
    --font-size-sm: 13px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 22px;
    --font-size-3xl: 28px;

    /* 圆角系统 */
    --radius-xs: 2px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;

    /* 阴影系统 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

    /* 过渡/动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.4s ease;

    /* 响应式断点 */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Microsoft Yahei", "PingFang SC", "Helvetica Neue", sans-serif;
    color: var(--color-text-primary);
    background-color: var(--color-white);
    line-height: 1.6;
}

ul, li {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

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

/* ========== 通用容器样式 ========== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
    width: 100%;
}

/* ========== 头部导航 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 999;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all var(--transition-normal);
}

.header.scrolled {
    padding: 8px 0;
    box-shadow: var(--shadow-sm);
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    transition: height var(--transition-normal);
}

.header.scrolled .header__container {
    height: 60px;
}

/* Logo样式 */
.logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo__text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-secondary);
}

.logo__tag {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.logo--footer .logo__text {
    color: var(--color-white);
}

.logo--footer .logo__tag {
    color: var(--color-text-tertiary);
}

/* Logo图片样式 - 适配原有布局 */
.logo {
    display: inline-block; /* 保持链接行内块特性 */
    text-decoration: none; /* 移除下划线 */
}

.logo__img {
    height: 60px; /* 根据你的logo尺寸调整，建议固定高度、宽度自适应 */
    width: auto; /* 保持图片比例 */
    object-fit: contain; /* 防止图片变形 */
    vertical-align: middle; /* 垂直居中 */
}

/* 移动端适配logo大小 */
@media (max-width: 768px) {
    .logo__img {
        height: 40px; /* 移动端缩小logo */
    }
}

/* 视觉隐藏类 - 隐藏文字但保留SEO */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* 桌面导航 */
.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav__link {
    font-size: var(--font-size-md);
    color: var(--color-text-primary);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-sm) 0;
}

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

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

.nav__link--primary {
    color: var(--color-white);
    background-color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
}

.nav__link--primary::after {
    display: none;
}

.nav__link--primary:hover {
    background-color: var(--color-primary-light);
}

/* 移动端导航开关 */
.mobile-toggle {
    display: none;
    font-size: var(--font-size-xl);
    color: var(--color-secondary);
    cursor: pointer;
}

/* 移动端导航 */
.mobile-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-white);
    z-index: 1000;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
}

.mobile-nav.show {
    transform: translateX(0);
}

.mobile-nav__inner {
    height: 100%;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
}

.mobile-nav__close {
    align-self: flex-end;
    font-size: var(--font-size-xl);
    cursor: pointer;
    margin-bottom: var(--spacing-2xl);
}

.mobile-nav__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.mobile-nav__link {
    font-size: var(--font-size-lg);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-gray-200);
    color: var(--color-secondary);
}

.mobile-nav__link.active {
    color: var(--color-primary);
}

/* ========== 英雄区 ========== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.8);
    transform: scale(1.05);
    transition: transform 8s ease;
}

.hero:hover .hero__bg {
    transform: scale(1);
}

.hero__container {
    position: relative;
    z-index: 2;
}

.hero__content {
    max-width: 700px;
    color: var(--color-white);
}

.hero__title {
    font-size: var(--font-size-3xl);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero__desc {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.8;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.hero__btns {
    display: flex;
    gap: var(--spacing-lg);
}

.hero__scroll {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-white);
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: bounce 2s infinite;
}

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

/* ========== 通用区块标题 ========== */
.section__header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.section__header--split {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    margin-bottom: var(--spacing-2xl);
}

.section__header-inner {
    margin-bottom: var(--spacing-lg);
}

.section__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.section__desc {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section__header--left {
    text-align: left;
    margin-bottom: var(--spacing-2xl);
}

.section__header--left .section__desc {
    margin: 0;
}

.section__more {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary);
    font-weight: 500;
    gap: var(--spacing-xs);
    transition: color var(--transition-fast);
}

.section__more:hover {
    color: var(--color-primary-light);
}

/* ========== 核心优势 ========== */
.advantage__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.advantage__item {
    padding: var(--spacing-2xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.advantage__item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--color-primary);
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.advantage__item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.advantage__item:hover::before {
    transform: scaleY(1);
}

.advantage__item--highlight {
    background-color: var(--color-tertiary);
}

.advantage__icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    background-color: var(--color-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

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

.advantage__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-secondary);
}

.advantage__desc {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ========== 服务体系（首页） ========== */
.service {
    background-color: var(--color-gray-100);
}

.service__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.service__card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.service__card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.05) 0%, rgba(0, 102, 204, 0) 60%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.service__card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service__card:hover::after {
    opacity: 1;
}

.service__card-header {
    padding: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
}

.service__card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background-color: var(--color-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.service__card-title {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    font-weight: 600;
}

.service__card-body {
    padding: 0 var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    color: var(--color-text-secondary);
    line-height: 1.8;
    flex: 1;
}

.service__card-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-2xl);
    color: var(--color-primary);
    font-weight: 500;
    border-top: 1px solid var(--color-gray-200);
    margin-top: auto;
    transition: all var(--transition-normal);
}

.service__card:hover .service__card-link {
    color: var(--color-primary-light);
}

/* ========== 品牌理念 ========== */
.brand__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.brand__content {
    max-width: 500px;
}

.brand__title {
    font-size: var(--font-size-2xl);
    line-height: 1.3;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xl);
}

.brand__desc {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-2xl);
}

.brand__visual {
    position: relative;
}

.brand__img {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-lg);
    background-size: cover;
    background-position: center;
    box-shadow: var(--shadow-lg);
}

.brand__img::after {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    /*border: 2px solid var(--color-primary);*/
    /*border-radius: var(--radius-lg);*/
    z-index: -1;
}

/* ========== 行业动态（首页） ========== */
.news__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
}

.news__card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    height: 100%;
}

.news__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.news__card-img {
    height: 300px;
    background-size: cover;
    background-position: center;
}

.news__card-content {
    padding: var(--spacing-xl);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news__card-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.news__card-title {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.4;
}

.news__card-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    flex: 1;
    line-height: 1.7;
}

.news__card-link {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary);
    font-weight: 500;
    gap: var(--spacing-xs);
    margin-top: auto;
    transition: color var(--transition-fast);
}

.news__card-link:hover {
    color: var(--color-primary-light);
}

/* ========== 联系入口 ========== */
.contact-cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0;
}

.contact-cta__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.contact-cta__title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    line-height: 1.3;
}

.contact-cta__desc {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
    line-height: 1.8;
}

.contact-cta__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-cta__info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-md);
}

.contact-cta__info-item i {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.contact-cta__form {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.contact-cta__form-inner {
    padding: var(--spacing-2xl);
}

.contact-cta__form-title {
    font-size: var(--font-size-xl);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 600;
}

/* 表单通用样式 */
.form__group {
    margin-bottom: var(--spacing-lg);
}

.form__label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form__input {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-md);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    outline: none;
}

.form__input:focus {
    background-color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form__textarea {
    resize: none;
    min-height: 100px;
}

.form__btn {
    width: 100%;
    margin-top: var(--spacing-md);
    padding: 14px 0;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.form__btn:hover {
    background-color: var(--color-primary-light);
}

/* ========== 页脚 ========== */
.footer {
    background-color: var(--color-secondary);
    color: var(--color-text-tertiary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3xl);
}

.footer__top {
    display: grid;
    grid-template-columns: 2fr 3fr 2fr;
    gap: var(--spacing-2xl);
}

.footer__brand-desc {
    margin-top: var(--spacing-md);
    max-width: 300px;
    line-height: 1.8;
}

.footer__links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.footer__links-title {
    font-size: var(--font-size-md);
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.footer__links-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.footer__contact-title {
    font-size: var(--font-size-md);
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.footer__contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.footer__contact-item i {
    font-size: var(--font-size-md);
    margin-top: 2px;
    color: var(--color-primary);
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__copyright {
    font-size: var(--font-size-xs);
}

.footer__policy {
    display: flex;
    gap: var(--spacing-lg);
}

.footer__policy a {
    font-size: var(--font-size-xs);
}

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

/* ========== 回到顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background-color: var(--color-primary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 99;
    box-shadow: var(--shadow-md);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.back-to-top:active {
    transform: translateY(0);
}

/* ========== 内页Banner样式 ========== */
.page-banner {
    position: relative;
    height: 400px;
    min-height: 300px;
    display: flex;
    align-items: center;
    overflow: hidden;
    margin-top: 80px;
}

.page-banner__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.7);
}

.page-banner__container {
    position: relative;
    z-index: 2;
}

.page-banner__content {
    color: var(--color-white);
    max-width: 800px;
}

.page-banner__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.page-banner__desc {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.page-banner__breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.page-banner__breadcrumbs a {
    color: var(--color-white);
    opacity: 0.8;
}

.page-banner__breadcrumbs a:hover {
    opacity: 1;
}

.page-banner__breadcrumbs i {
    font-size: var(--font-size-xs);
    opacity: 0.7;
}

/* ========== 关于我们页面样式 ========== */
.about-intro__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    margin-bottom: var(--spacing-3xl);
}

.about-intro__desc {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-intro__img {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-lg);
    background-size: cover;
    background-position: center;
    box-shadow: var(--shadow-md);
}

/* 发展历程时间轴 */
.about-history__timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: var(--spacing-xl);
}

.about-history__timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20px;
    width: 2px;
    height: 100%;
    background-color: var(--color-primary);
}

.about-history__item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    padding-left: var(--spacing-2xl);
}

.about-history__item::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 0;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background-color: var(--color-tertiary);
    border: 2px solid var(--color-primary);
    z-index: 1;
}

.about-history__year {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.about-history__content h3 {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.about-history__content p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* 核心价值观 */
.about-value__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.about-value__item {
    padding: var(--spacing-2xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
}

.about-value__item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.about-value__icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    background-color: var(--color-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    margin: 0 auto var(--spacing-lg);
}

.about-value__title {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.about-value__desc {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========== 服务页面样式（核心修复） ========== */
.service-nav {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 80px;
    z-index: 80;
    margin-bottom: 30px;
    padding: 10px 0;
    transition: top var(--transition-normal);
}

/* 适配header滚动后的sticky位置 */
.header.scrolled ~ .service-nav {
    top: 60px;
}

.service-content-wrapper {
    min-height: 500px;
    padding-bottom: 20px;
    width: 100%;
}

.service-nav__tabs {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-xs) 0;
    justify-content: flex-start;
    scrollbar-width: none;
}

.service-nav__tabs::-webkit-scrollbar {
    display: none;
}

.service-nav__tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--color-text-primary);
    transition: all var(--transition-normal);
    white-space: nowrap;
    border: none;
    cursor: pointer;
    font-size: 14px;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-nav__tab.active {
    background-color: var(--color-primary) !important;
    color: var(--color-white) !important;
    box-shadow: 0 2px 8px rgba(0, 86, 210, 0.3);
}

.service-nav__tab:hover:not(.active) {
    background-color: var(--color-gray-200);
    transform: translateY(-2px);
}

.service-nav__tab:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

/* 服务详情 - 修复切换不显示问题 */
.service-detail {
    opacity: 0;
    visibility: hidden;
    height: 0;
    overflow: hidden;
    transition: all var(--transition-slow);
    padding: 20px 0;
    width: 100%;
    box-sizing: border-box;
}

.service-detail.active {
    opacity: 1;
    visibility: visible;
    height: auto;
    overflow: visible;
    animation: fadeInUp 0.6s ease;
}

.service-detail__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: flex-start;
    margin-bottom: var(--spacing-2xl);
    padding: 10px 0;
    width: 100%;
}

.service-detail__img {
    width: 100%;
    height: 350px;
    border-radius: var(--radius-lg);
    background-size: cover;
    background-position: center;
    box-shadow: var(--shadow-md);
    object-fit: cover;
    min-height: 300px;
}

.service-detail__desc {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    font-size: 15px;
}

.service-detail__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-left: 0;
}

.service-detail__list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
    font-size: 14px;
}

.service-detail__list li::before {
    content: "✓";
    color: var(--color-primary);
    margin-right: 8px;
    font-weight: bold;
    margin-top: 4px;
    display: inline-block;
}

.service-detail__btn {
    display: inline-block;
    padding: 10px 24px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    margin-top: 10px;
}

.service-detail__btn:hover {
    background-color: var(--color-primary-light);
    box-shadow: 0 4px 12px rgba(0, 86, 210, 0.2);
    transform: translateY(-2px);
}

/* 服务优势区域 */
.service-advantage__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-top: 20px;
}

.service-advantage__item {
    padding: var(--spacing-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
}

.service-advantage__item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service-advantage__icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background-color: var(--color-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    margin: 0 auto var(--spacing-md);
}

.service-advantage__title {
    font-size: var(--font-size-md);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.service-advantage__desc {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 14px;
}

/* ========== 新闻页面样式 ========== */
.news-filter {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.news-filter__container {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-md) 0;
}

.news-filter__btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--color-text-primary);
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.news-filter__btn.active {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.news-filter__btn:hover:not(.active) {
    background-color: var(--color-gray-200);
}

.news-list__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.news-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.news-card__img {
    height: 200px;
    background-size: cover;
    background-position: center;
}

.news-card__content {
    padding: var(--spacing-xl);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-card__meta {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.news-card__category {
    background-color: var(--color-tertiary);
    color: var(--color-primary);
    padding: 2px var(--spacing-xs);
    border-radius: var(--radius-xs);
    font-weight: 500;
}

.news-card__title {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.4;
}

.news-card__desc {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
    flex: 1;
}

.news-card__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--color-primary);
    font-weight: 500;
    margin-top: auto;
    transition: color var(--transition-fast);
}

.news-card__link:hover {
    color: var(--color-primary-light);
}

.news-pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
}

.news-pagination__btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-gray-100);
    color: var(--color-text-primary);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.news-pagination__btn.active {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.news-pagination__btn:hover:not(.disabled):not(.active) {
    background-color: var(--color-gray-200);
}

.news-pagination__btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========== 联系我们页面样式 ========== */
.contact-info__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.contact-info__item {
    padding: var(--spacing-2xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-info__item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.contact-info__icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    background-color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--color-white);
    margin: 0 auto var(--spacing-lg);
}

.contact-info__title {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.contact-info__content {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.contact-info__content a {
    color: var(--color-primary);
    font-weight: 500;
}

.contact-form-map__container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.contact-map__placeholder {
    width: 100%;
    height: 758px;
    border-radius: var(--radius-lg);
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}

.contact-map__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    color: var(--color-white);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: background-color var(--transition-normal);
}

.contact-map__overlay:hover {
    background-color: rgba(0, 0, 0, 0.4);
}

.contact-form {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-2xl);
}

.contact-form__title {
    font-size: var(--font-size-xl);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 600;
}

.contact-notice__list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-notice__list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.contact-notice__list li i {
    color: var(--color-primary);
    margin-top: 4px;
    font-size: var(--font-size-md);
}

/* ========== 动画定义 ========== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* ========== 通用优化样式 ========== */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

.img-lazy {
    background-color: var(--color-gray-100);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='18' height='18' rx='2' ry='2'%3E%3C/rect%3E%3Ccircle cx='8.5' cy='8.5' r='1.5'%3E%3C/circle%3E%3Cpolyline points='21 15 16 10 5 21'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

/* ========== 响应式适配（统一优化） ========== */
@media (max-width: var(--breakpoint-xl)) {
    /* 通用网格适配 */
    .advantage__grid,
    .service__grid,
    .news__grid,
    .brand__container,
    .contact-cta__container,
    .footer__top,
    .about-intro__container,
    .about-value__grid,
    .service-detail__container,
    .service-advantage__grid,
    .contact-info__grid,
    .news-list__grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    /* 元素尺寸适配 */
    .brand__img {
        height: 350px;
    }

    .brand__img::after {
        top: -15px;
        right: -15px;
    }

    .contact-map__placeholder {
        height: 400px;
    }

    .service-nav {
        top: 70px;
    }
}

@media (max-width: var(--breakpoint-md)) {
    /* 导航适配 */
    .nav {
        display: none;
    }

    .mobile-toggle {
        display: block;
    }

    /* 英雄区适配 */
    .hero {
        height: auto;
        min-height: 600px;
        padding: 120px 0 80px;
    }

    .hero__btns {
        flex-direction: column;
    }

    /* 区块间距适配 */
    .section {
        padding: var(--spacing-2xl) 0;
    }

    .section__header {
        margin-bottom: var(--spacing-2xl);
    }

    .section__header--split {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    /* 内页适配 */
    .page-banner {
        height: 300px;
        margin-top: 60px;
    }

    .page-banner__title {
        font-size: var(--font-size-xl);
    }

    .page-banner__desc {
        font-size: var(--font-size-md);
    }

    /* 服务页面适配 */
    .service-nav {
        top: 60px;
        margin-bottom: 20px;
    }

    .service-detail__container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .service-detail__img {
        height: 280px;
    }

    .service-nav__tab {
        padding: 8px 16px;
        font-size: 13px;
    }

    /* 关于页面适配 */
    .about-intro__container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .about-intro__img {
        height: 300px;
    }

    .about-history__timeline {
        padding-left: var(--spacing-lg);
    }

    .about-history__item {
        padding-left: var(--spacing-xl);
    }

    /* 联系页面适配 */
    .contact-info__grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: var(--breakpoint-sm)) {
    /* 通用网格单列适配 */
    .footer__links,
    .service-advantage__grid,
    .contact-info__grid,
    .news-list__grid,
    .about-value__grid {
        grid-template-columns: 1fr;
    }

    /* 元素尺寸适配 */
    .advantage__item {
        padding: var(--spacing-xl);
    }

    .service__card-header {
        padding: var(--spacing-xl);
        padding-bottom: var(--spacing-md);
    }

    .service__card-body {
        padding: 0 var(--spacing-xl);
        padding-bottom: var(--spacing-lg);
    }

    .service__card-link {
        padding: var(--spacing-md) var(--spacing-xl);
    }

    .news__card {
        height: auto;
    }

    .news__card-img {
        height: 180px;
    }

    .news__card-content {
        padding: var(--spacing-lg);
    }

    .contact-cta__form-inner {
        padding: var(--spacing-lg);
    }

    .contact-form {
        padding: var(--spacing-lg);
    }

    /* 英雄区适配 */
    .hero__title {
        font-size: var(--font-size-2xl);
    }

    .hero__desc {
        font-size: var(--font-size-md);
    }

    /* 回到顶部适配 */
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }

    /* 服务页面适配 */
    .service-content-wrapper {
        min-height: 400px;
    }

    .service-detail__list li {
        font-size: 13px;
    }

    /* 内页适配 */
    .page-banner {
        height: 250px;
        padding: 40px 0;
    }

    .about-history__year {
        font-size: var(--font-size-lg);
    }

    .contact-map__placeholder {
        height: 300px;
    }
}