/* === V5 (重塑版) 基本样式与变量 === */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
    /* V5 色彩方案 - 深蓝主调 + 黄色点缀 */
    --primary-color-v5: #3b82f6; /* Blue 500 */
    --primary-light-v5: #93c5fd; /* Blue 300 */
    --primary-dark-v5: #1d4ed8; /* Blue 700 */
    --secondary-color-v5: #64748b; /* Slate 500 - 中性辅助色 */
    --accent-color-v5: #facc15; /* Yellow 400 */
    --accent-dark-v5: #eab308; /* Yellow 500 */
    --light-bg-v5: #f8fafc; /* Slate 50 - 非常浅的背景 */
    --medium-bg-v5: #f1f5f9; /* Slate 100 - 略深的背景 */
    --white-v5: #ffffff;
    --dark-text-v5: #0f172a; /* Slate 900 */
    --medium-text-v5: #334155; /* Slate 700 */
    --light-text-v5: #64748b; /* Slate 500 */
    --border-color-light-v5: #e2e8f0; /* Slate 200 */
    --border-color-medium-v5: #cbd5e1; /* Slate 300 */
    --footer-bg-v5: #0f172a; /* Slate 900 - 深色页脚 */
    --footer-text-v5: #cbd5e1; /* Slate 300 */
    --footer-link-hover-v5: var(--accent-color-v5);

    /* V5 字体 (Poppins + Noto Sans SC) */
    --font-primary-v5: 'Poppins', 'Noto Sans SC', sans-serif;
    --font-secondary-v5: 'Poppins', 'Noto Sans SC', sans-serif; /* 统一字体 */

    /* V5 阴影 (更微妙、柔和) */
    --shadow-sm-v5: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md-v5: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
    --shadow-lg-v5: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
    --shadow-xl-v5: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* V5 圆角 (更锐利) */
    --border-radius-base-v5: 6px;
    --border-radius-lg-v5: 10px;

    --transition-v5: all 0.25s ease-in-out;
}

/* === V5 重置与全局设置 === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.theme-v5 {
    font-family: var(--font-primary-v5);
    line-height: 1.65; /* 调整行高 */
    color: var(--medium-text-v5);
    background-color: var(--white-v5);
    opacity: 1;
    transition: none;
}

body.theme-v5.loaded {
    opacity: 1;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 6rem 0; /* 增加 Section 间距 */
    position: relative;
    /* overflow: hidden; 保留 */
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary-color-v5);
    text-decoration: none;
    transition: var(--transition-v5);
}

a:hover {
    color: var(--primary-dark-v5);
}

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary-v5);
    color: var(--dark-text-v5);
    line-height: 1.3;
    font-weight: 700; /* 默认标题加粗 */
    letter-spacing: -0.5px; /* 微调字间距 */
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-header h2 {
    font-size: 2.4rem; /* 增大 Section 标题 */
    margin-bottom: 1rem;
    font-weight: 800; /* 更粗 */
}

.section-header p {
    font-size: 1.05rem;
    color: var(--light-text-v5);
    max-width: 650px; /* 调整最大宽度 */
    margin: 0 auto;
}

/* === V5 按钮样式 (锐利风格) === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.8rem; /* 调整按钮内边距 */
    border-radius: var(--border-radius-base-v5);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition-v5);
    cursor: pointer;
    border: 1.5px solid transparent; /* 预留边框位置 */
    text-transform: none;
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.btn i {
    margin-left: 0.6rem;
    font-size: 0.85rem;
}

/* V5 主按钮 - 颜色反转效果 */
.btn-primary {
    background-color: var(--primary-color-v5);
    color: white;
    border-color: var(--primary-color-v5);
    box-shadow: var(--shadow-sm-v5);
}

.btn-primary:hover {
    background-color: var(--primary-dark-v5);
    border-color: var(--primary-dark-v5);
    box-shadow: var(--shadow-md-v5);
    transform: translateY(-1px);
}

/* V5 描边按钮 - 背景填充 + 边框消失 */
.btn-outline {
    background: transparent;
    color: var(--primary-color-v5);
    border-color: var(--primary-color-v5);
}

.btn-outline:hover {
    background-color: var(--primary-color-v5);
    color: white;
    /* border-color: var(--primary-color-v5); 边框颜色不变，但背景覆盖 */
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm-v5);
}

/* === V5 导航栏 (简洁风格) === */
.header-v5 {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.98); /* 更不透明 */
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    padding: 0.8rem 0;
    transition: var(--transition-v5);
    border-bottom: 1px solid var(--border-color-light-v5);
    box-shadow: none;
}

.header-v5.scrolled {
    padding: 0.6rem 0;
    box-shadow: var(--shadow-sm-v5); 
    background-color: rgba(255, 255, 255, 1);
}

.header-v5 .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-v5 .logo {
    display: flex;
    align-items: center;
}

.header-v5 .logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-text-v5);
    margin-left: 0.6rem;
}

.header-v5 .logo-icon {
    width: 38px;
    height: 38px;
    background: var(--primary-color-v5);
    border-radius: var(--border-radius-base-v5);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
    box-shadow: none; /* 移除阴影 */
}

.header-v5 .nav-links {
    display: flex;
    gap: 1.6rem; /* 减小间距 */
}

.header-v5 .nav-links a {
    color: var(--medium-text-v5);
    font-weight: 500;
    position: relative;
    padding: 0.3rem 0;
    font-size: 0.85rem; /* 减小字体 */
}

.header-v5 .nav-links a i {
    display: none;
}

.header-v5 .nav-links a:hover, 
.header-v5 .nav-links a.active {
    color: var(--primary-color-v5);
}

/* V5 Nav Link Hover - 强调色点 */
.header-v5 .nav-links a::after {
    content: '';
    position: absolute;
    width: 5px;
    height: 5px;
    background: var(--accent-color-v5);
    bottom: -8px; /* 调整位置 */
    left: 50%;
    border-radius: 50%;
    transform: translateX(-50%) scale(0);
    transition: transform 0.2s ease;
}

.header-v5 .nav-links a:hover::after, 
.header-v5 .nav-links a.active::after {
    transform: translateX(-50%) scale(1);
}

.header-v5 .mobile-menu {
    display: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--dark-text-v5);
}

/* === V5 英雄区域 (简洁专业) === */
.hero-v5 {
    padding: 10rem 0 8rem;
    background-color: var(--light-bg-v5); /* 纯色背景 */
    text-align: center;
    position: relative;
    /* 移除渐变和浮动元素 */
}

.hero-v5::before, .hero-v5::after { display: none; } /* 移除背景元素 */

.hero-v5 .hero-content {
    max-width: 750px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-v5 .hero-content h1 {
    font-size: 3.6rem; /* 调整大小 */
    font-weight: 800; /* 加粗 */
    margin-bottom: 1.5rem;
    line-height: 1.2;
    color: var(--dark-text-v5);
    /* 移除文字渐变 */
    background: none;
    -webkit-background-clip: unset;
    -webkit-text-fill-color: unset;
    background-clip: unset;
    color: var(--dark-text-v5);
    /* animation: fadeInUp-v5 1s ease forwards; 保持动画 */
}

/* 标题中的强调色 */
.hero-v5 .hero-content h1 .highlight {
    color: var(--primary-color-v5);
}

.hero-v5 .hero-content p {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    color: var(--medium-text-v5);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    /* animation: fadeInUp-v5 1s ease 0.2s forwards; */
    /* animation-fill-mode: both; */
}

.hero-v5 .hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem; /* 减小按钮间距 */
    /* animation: fadeInUp-v5 1s ease 0.4s forwards; */
    /* animation-fill-mode: both; */
}

/* === V5 关于我们 (简洁布局) === */
.about-v5 {
    background-color: var(--white-v5);
}

.about-v5 .about-content {
    display: grid;
    grid-template-columns: 1fr 1.1fr; /* 文本略宽 */
    gap: 4rem; /* 增大间距 */
    align-items: center;
}

.about-v5 .about-image {
    border-radius: var(--border-radius-lg-v5);
    overflow: hidden;
    box-shadow: var(--shadow-md-v5); /* 减小阴影 */
    position: relative;
}

/* 移除图片悬停放大 */
.about-v5 .about-image img {
    transition: none;
}
.about-v5 .about-image:hover img {
    transform: none;
}

.about-v5 .about-text h3 {
    font-size: 2rem; /* 增大标题 */
    margin-bottom: 1rem;
    color: var(--dark-text-v5);
    font-weight: 700;
}

.about-v5 .about-text p {
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: var(--medium-text-v5);
}

.about-v5 .about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
    background-color: transparent; /* 透明背景 */
    padding: 0; /* 移除内边距 */
    border: none; /* 移除边框 */
}

.about-v5 .stat-item {
    text-align: left; /* 左对齐 */
    padding: 1rem;
    border-left: 3px solid var(--primary-color-v5); /* 左侧边框强调 */
    background-color: var(--light-bg-v5);
    border-radius: var(--border-radius-base-v5);
}

.about-v5 .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-dark-v5);
    margin-bottom: 0.1rem;
}

.about-v5 .stat-text {
    font-size: 0.8rem;
    color: var(--medium-text-v5); /* 调整颜色 */
    text-transform: none; /* 移除大写 */
    letter-spacing: 0;
    font-weight: 400;
}

/* === V5 产品展示 (卡片优化) === */
.products-v5 {
    background-color: var(--medium-bg-v5); /* 使用中性背景 */
}

.products-v5 .product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.products-v5 .product-card {
    background: var(--white-v5);
    border-radius: var(--border-radius-lg-v5);
    overflow: hidden;
    box-shadow: var(--shadow-sm-v5); /* 更轻的阴影 */
    transition: var(--transition-v5);
    border: 1px solid var(--border-color-light-v5);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

/* 移除之前的悬停边框 */
.products-v5 .product-card::after { display: none; }

/* V5 卡片悬停 - 边框变色 + 轻微上移 */
.products-v5 .product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md-v5);
    border-color: var(--primary-color-v5);
}

.products-v5 .product-image {
    height: 200px; /* 减小图片高度 */
    overflow: hidden;
    position: relative;
}

/* 移除图片上的渐变遮罩 */
.products-v5 .product-image::before { display: none; }

/* 图片悬停效果 - 移除缩放 */
.products-v5 .product-image img {
    transition: none;
}
.products-v5 .product-card:hover .product-image img {
    transform: none;
}

.products-v5 .product-info {
    padding: 1.2rem; /* 调整内边距 */
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.products-v5 .product-info h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark-text-v5);
}

.products-v5 .product-info p {
    color: var(--medium-text-v5);
    font-size: 0.85rem; /* 减小描述文字 */
    margin-bottom: 1rem;
    flex-grow: 1;
}

/* V5 产品链接 - 使用强调色 */
.products-v5 .product-link {
    color: var(--primary-color-v5);
    font-weight: 500;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: auto;
}
.products-v5 .product-link:hover {
    color: var(--primary-dark-v5);
    text-decoration: none; /* 移除下划线 */
}
.products-v5 .product-link:hover i {
    transform: translateX(3px);
    color: var(--accent-color-v5); /* 箭头变色 */
}

/* === V5 服务项目 (图标和布局调整) === */
.services-v5 {
    background-color: var(--white-v5);
}

.services-v5 .services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); /* 调整最小宽度 */
    gap: 1.8rem; /* 减小间距 */
}

.services-v5 .service-card {
    background: transparent; /* 透明背景 */
    border-radius: var(--border-radius-lg-v5);
    padding: 2rem 1.5rem;
    text-align: left; /* 左对齐 */
    box-shadow: none; /* 移除阴影 */
    transition: var(--transition-v5);
    border: 1px solid transparent; /* 默认无边框 */
    display: flex;
    /* flex-direction: column; */
    align-items: flex-start; /* 图标和文字顶部对齐 */
    position: relative;
    overflow: hidden;
    z-index: 1;
    gap: 1.2rem; /* 图标和文字间距 */
}

/* V5 服务卡片悬停 - 背景色 + 边框 */
.services-v5 .service-card:hover {
    transform: none; /* 移除上移 */
    box-shadow: var(--shadow-md-v5);
    border-color: var(--border-color-light-v5);
    background-color: var(--white-v5);
}

.services-v5 .service-icon {
    width: 50px; /* 减小图标尺寸 */
    height: 50px;
    background: var(--primary-color-v5);
    /* background: linear-gradient(135deg, var(--primary-color-v5), var(--primary-dark-v5)); */
    border-radius: var(--border-radius-base-v5); /* 方形圆角 */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: white;
    transition: var(--transition-v5);
    margin-bottom: 0; /* 移除底部间距 */
    box-shadow: none; /* 移除阴影 */
    flex-shrink: 0; /* 防止图标被压缩 */
}

/* 移除图标悬停效果 */
.services-v5 .service-card:hover .service-icon {
    transform: none;
    box-shadow: none;
    background: var(--primary-dark-v5);
}

.services-v5 .service-card .service-text-content {
    /* flex-grow: 1; */
}

.services-v5 .service-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem; /* 减小间距 */
    font-weight: 600;
    color: var(--dark-text-v5);
    position: relative;
    padding-bottom: 0;
}

.services-v5 .service-card h3::after { display: none; } /* 移除标题下划线 */

.services-v5 .service-card p {
    color: var(--medium-text-v5);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* === V5 新闻动态 (布局微调) === */
.news-v5 {
    background-color: var(--medium-bg-v5);
}

.news-v5 .news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.news-v5 .news-card {
    background-color: var(--white-v5);
    border-radius: var(--border-radius-lg-v5);
    overflow: hidden;
    box-shadow: var(--shadow-sm-v5);
    transition: var(--transition-v5);
    border: 1px solid var(--border-color-light-v5);
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* V5 新闻卡片悬停 */
.news-v5 .news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md-v5);
    border-color: var(--primary-light-v5);
}

.news-v5 .news-image {
    height: 180px; /* 减小图片高度 */
    overflow: hidden;
    position: relative;
}

/* 移除图片效果 */
.news-v5 .news-image img {
    transition: none;
    filter: none;
}
.news-v5 .news-card:hover .news-image img {
    transform: none;
    filter: none;
}
.news-v5 .news-image::after { display: none; }

.news-v5 .news-content {
    padding: 1.3rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.news-v5 .news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem; /* 减小字体 */
    margin-bottom: 0.7rem;
    color: var(--light-text-v5);
}

.news-v5 .news-date {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.news-v5 .news-category {
    background-color: var(--medium-bg-v5);
    color: var(--secondary-color-v5); /* 使用辅助色 */
    padding: 3px 8px;
    font-weight: 500;
    border-radius: var(--border-radius-base-v5);
    font-size: 0.7rem;
}

.news-v5 .news-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.7rem;
    line-height: 1.4;
}

.news-v5 .news-title a {
    color: var(--dark-text-v5);
    transition: var(--transition-v5);
}

.news-v5 .news-title a:hover {
    color: var(--primary-color-v5);
}

.news-v5 .news-excerpt {
    font-size: 0.85rem;
    color: var(--medium-text-v5);
    margin-bottom: 1rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;  
    overflow: hidden;
    flex-grow: 1;
}

/* V5 阅读更多 */
.news-v5 .news-readmore {
    color: var(--primary-color-v5);
    font-size: 0.8rem;
    font-weight: 600; /* 加粗 */
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: auto;
}

.news-v5 .news-readmore:hover {
    color: var(--primary-dark-v5);
    text-decoration: none;
}

.news-v5 .news-readmore:hover i {
    transform: translateX(4px);
    color: var(--accent-color-v5);
}

/* === V5 联系我们 (表单美化) === */
.contact-v5 {
    background-color: var(--white-v5);
    padding-bottom: 6rem;
}

.contact-v5 .contact-content {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr; /* 调整比例 */
    gap: 3rem;
    align-items: flex-start;
}

.contact-v5 .contact-form {
    background: var(--light-bg-v5); /* 浅色背景 */
    border-radius: var(--border-radius-lg-v5);
    padding: 2.5rem;
    box-shadow: none; /* 移除阴影 */
    border: 1px solid var(--border-color-light-v5);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.contact-v5 .contact-form::before { display: none; } /* 移除背景元素 */

.contact-v5 .form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.contact-v5 .form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--dark-text-v5);
}

.contact-v5 .form-group input,
.contact-v5 .form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color-medium-v5); /* 稍深边框 */
    border-radius: var(--border-radius-base-v5);
    font-family: inherit;
    font-size: 0.9rem;
    transition: var(--transition-v5);
    background-color: var(--white-v5);
    color: var(--dark-text-v5);
}

.contact-v5 .form-group input::placeholder,
.contact-v5 .form-group textarea::placeholder {
    color: var(--light-text-v5);
    opacity: 0.7;
}

.contact-v5 .form-group input:focus,
.contact-v5 .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color-v5);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2); /* Blue focus */
}

.contact-v5 .form-group textarea {
    height: 110px;
    resize: vertical;
}

.contact-v5 .contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-v5 .info-item {
    background: transparent; /* 透明背景 */
    border-radius: 0; /* 移除圆角 */
    padding: 1.5rem 0;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid var(--border-color-light-v5); /* 底部边框分隔 */
    transition: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
    display: flex; /* 横向布局 */
    align-items: center; /* 垂直居中 */
    gap: 1.5rem;
}

.contact-v5 .info-item:last-child {
    border-bottom: none;
}

/* 移除悬停效果 */
.contact-v5 .info-item:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border-color-light-v5);
    background-color: transparent;
}

.contact-v5 .info-icon {
    width: 45px;
    height: 45px;
    background: var(--primary-light-v5); /* 浅蓝色背景 */
    border-radius: var(--border-radius-base-v5);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary-dark-v5); /* 深蓝色图标 */
    margin-bottom: 0;
    box-shadow: none;
    transition: var(--transition-v5);
    flex-shrink: 0;
}

/* 移除图标悬停 */
.contact-v5 .info-item:hover .info-icon {
    transform: none;
}

.contact-v5 .info-item-content {
    flex-grow: 1;
}

.contact-v5 .info-item h3 {
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
    color: var(--dark-text-v5);
}

.contact-v5 .info-item p {
    color: var(--medium-text-v5);
    margin-bottom: 0.2rem;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-v5 .info-item p i {
    color: var(--secondary-color-v5);
    font-size: 0.85rem;
    width: 14px;
    text-align: center;
    transition: none;
}

.contact-v5 .info-item:hover p i {
    color: var(--secondary-color-v5);
}

/* === V5 友情链接 (简化) === */
.friend-links-v5 {
    background-color: var(--medium-bg-v5);
    padding: 3rem 0;
    border-top: 1px solid var(--border-color-light-v5);
}

.friend-links-v5 .section-header {
    margin-bottom: 2.5rem;
}
.friend-links-v5 .section-header p {
    color: var(--medium-text-v5);
}

.friend-links-v5 .links-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem 1.2rem;
    max-width: 900px;
    margin: 0 auto;
}

.friend-links-v5 .links-grid a {
    color: var(--medium-text-v5);
    font-size: 0.85rem;
    padding: 4px 10px;
    border-radius: var(--border-radius-base-v5);
    transition: var(--transition-v5);
    background-color: transparent; /* 透明背景 */
    border: 1px solid var(--border-color-medium-v5); /* 边框 */
}

.friend-links-v5 .links-grid a:hover {
    color: var(--primary-dark-v5);
    background-color: var(--primary-light-v5); /* 悬停背景 */
    border-color: var(--primary-light-v5);
    box-shadow: none;
    transform: none;
}

/* === V5 页脚 (深色简洁) === */
.footer-v5 {
    background-color: var(--footer-bg-v5);
    color: var(--footer-text-v5);
    padding: 4.5rem 0 1.5rem;
    position: relative;
    overflow: hidden;
}

/* 移除页脚背景元素 */
.footer-v5::before, .footer-v5::after { display: none; }

.footer-v5 .footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr; /* 调整列宽 */
    gap: 2.5rem;
    margin-bottom: 2.5rem;
    position: relative;
    z-index: 1;
}

.footer-v5 .footer-content h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--white-v5);
    position: relative;
    padding-bottom: 0.5rem;
    font-weight: 600;
    border-bottom: 1px solid var(--secondary-color-v5); /* 底部边框 */
}

.footer-v5 .footer-content h3::after { display: none; } /* 移除彩色下划线 */

.footer-v5 .footer-about p {
    color: var(--footer-text-v5);
    font-size: 0.85rem;
    line-height: 1.7;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.footer-v5 .social-icons {
    display: flex;
    gap: 0.8rem;
    margin-top: 1rem;
}

.footer-v5 .social-icons a {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1); /* 稍亮背景 */
    border-radius: var(--border-radius-base-v5); /* 方角 */
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--footer-text-v5);
    transition: var(--transition-v5);
    font-size: 0.9rem;
}

.footer-v5 .social-icons a:hover {
    color: var(--footer-bg-v5); /* 深色图标 */
    background-color: var(--accent-color-v5); /* 强调色背景 */
    transform: none;
    box-shadow: none;
}

.footer-v5 .footer-links ul li {
    margin-bottom: 0.5rem;
}

.footer-v5 .footer-links a {
    color: var(--footer-text-v5);
    transition: var(--transition-v5);
    display: inline-flex;
    align-items: center;
    font-size: 0.85rem;
    opacity: 0.8;
}

.footer-v5 .footer-links a i {
    display: none; /* 移除图标 */
}

.footer-v5 .footer-links a:hover {
    color: var(--footer-link-hover-v5);
    opacity: 1;
    transform: none;
    text-decoration: underline;
}

.footer-v5 .footer-contact p {
    color: var(--footer-text-v5);
    margin-bottom: 0.6rem;
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.85rem;
    opacity: 0.8;
}

.footer-v5 .footer-contact i {
    color: var(--primary-light-v5);
    margin-top: 0.2em;
    width: 14px;
    text-align: center;
    flex-shrink: 0;
    opacity: 0.8;
}

.footer-v5 .footer-bottom {
    border-top: 1px solid var(--secondary-color-v5); /* 使用辅助色边框 */
    padding-top: 1.5rem;
    text-align: center;
    color: var(--secondary-color-v5); /* 使用辅助色 */
    font-size: 0.8rem;
}

.footer-v5 .footer-bottom a {
    color: var(--primary-light-v5);
    font-weight: 500;
    transition: color 0.3s ease;
}
.footer-v5 .footer-bottom a:hover {
    color: var(--white-v5);
}

/* === V5 回到顶部按钮 (匹配新风格) === */
.scroll-top-btn {
    position: fixed;
    bottom: 1.8rem;
    right: 1.8rem;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-base-v5);
    background: var(--primary-color-v5);
    color: white;
    border: none;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    transition: all 0.3s ease-out;
    box-shadow: var(--shadow-md-v5);
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    background-color: var(--primary-dark-v5);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg-v5);
}

/* === V5 响应式调整 === */
@media (max-width: 992px) {
    .header-v5 .nav-links { display: none; }
    .header-v5 .mobile-menu { display: block; }
    .about-v5 .about-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .about-v5 .about-text {
        order: -1; 
    }
    .contact-v5 .contact-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
     .footer-v5 .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    .contact-v5 .info-item {
        padding: 1rem 0;
    }
}

@media (max-width: 768px) {
     /* Mobile Nav Styles - Adapted for V5 (Sharp Style) */
    .nav-links { 
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%; 
        max-width: 280px;
        height: 100vh;
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        background: var(--white-v5);
        padding: 5rem 0 2rem; /* 调整内边距 */
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.08);
        transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1001;
        gap: 0;
        border-left: 1px solid var(--border-color-light-v5);
    }
    .nav-links.active {
        right: 0;
    }
    .nav-links li {
        margin: 0;
        width: 100%;
    }
    .nav-links a {
        display: flex;
        align-items: center;
        padding: 0.8rem 1.5rem; 
        font-size: 0.95rem;
        color: var(--dark-text-v5);
        font-weight: 500;
        border-bottom: 1px solid var(--border-color-light-v5);
        width: 100%;
    }
    .nav-links a i {
        display: inline-block; 
        margin-right: 0.8rem;
        width: 20px; 
        text-align: center;
        color: var(--primary-color-v5);
        font-size: 1rem;
    }
    .nav-links a.active, .nav-links a:hover {
        color: var(--primary-color-v5);
        background-color: var(--light-bg-v5);
    }
    .nav-links a::after { display: none; }

    .overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.4); /* 稍浅遮罩 */
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    .overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    .hero-v5 .hero-content h1 {
        font-size: 2.6rem;
    }
    .hero-v5 .hero-content p {
        font-size: 1rem;
    }
     .section-header h2 {
        font-size: 2rem;
    }
    .services-v5 .service-card {
        padding: 1.5rem 1rem;
        gap: 1rem;
        flex-direction: column; /* 移动端改回垂直 */
        align-items: center;
        text-align: center;
    }
    .services-v5 .service-icon {
        margin-bottom: 0.5rem;
    }
    .contact-v5 .info-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 0.8rem;
    }
}

@media (max-width: 576px) {
    section {
        padding: 4.5rem 0;
    }
    .container {
        padding: 0 1rem;
    }
    .hero-v5 .hero-content h1 {
        font-size: 2.1rem;
    }
    .hero-v5 .hero-content p {
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }
    .hero-v5 .hero-buttons {
        flex-direction: column;
        gap: 0.8rem;
    }
    .hero-v5 .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
        padding: 0.7rem 1.5rem;
    }
     .about-v5 .about-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
     .footer-v5 .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
     .footer-v5 .footer-content h3 {
        border-bottom: none;
        padding-bottom: 0.2rem;
        margin-bottom: 0.8rem;
     }
    .footer-v5 .footer-content h3::after { /* Add center underline on mobile */
        content: '';
        display: block;
        width: 40px;
        height: 2px;
        background: var(--primary-color-v5);
        margin: 0.5rem auto 0;
    }
     .footer-v5 .footer-about .social-icons {
         justify-content: center;
     }
     .footer-v5 .footer-links ul {
         padding-left: 0;
     }
      .footer-v5 .footer-contact p {
         justify-content: center;
         text-align: center;
     }
     .footer-v5 .footer-bottom {
         font-size: 0.75rem;
         padding-top: 1.5rem;
     }
}

/* === V5 移除动画效果 (如果之前移除了 fade-up 类，这部分可以注释掉或移除) === */
/* 
.fade-up {
    opacity: 1;
    transform: translateY(0);
    transition: none;
}
.fade-up.fade-in {
    opacity: 1;
    transform: translateY(0);
}
.fade-up:nth-child(n) { transition-delay: 0s !important; }
*/

/* === V5 移除波浪分隔符 === */
.wave-divider { display: none; }

/* === V5 自定义滚动条 (匹配新风格) === */
::-webkit-scrollbar {
    width: 8px; /* 更细 */
}

::-webkit-scrollbar-track {
    background: var(--medium-bg-v5);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color-v5); /* 使用辅助色 */
    border-radius: 4px;
    border: none; /* 移除边框 */
}

::-webkit-scrollbar-thumb:hover {
    background: var(--medium-text-v5);
} 