/* === V7 (科技暗色) 基本样式与变量 === */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
    /* V7 色彩方案 - 深蓝/黑背景 + 亮青/蓝强调 */
    --primary-color-v7: #2dd4bf; /* Teal 400 - 亮青色 */
    --primary-light-v7: #5eead4; /* Teal 300 */
    --primary-dark-v7: #14b8a6; /* Teal 500 */
    --secondary-color-v7: #0ea5e9; /* Sky 500 - 亮蓝色 */
    --accent-color-v7: #a78bfa; /* Violet 400 - 紫色点缀 */

    --bg-dark-v7: #0f172a; /* Slate 900 - 主背景色 */
    --bg-medium-dark-v7: #1e293b; /* Slate 800 - 稍浅背景 */
    --bg-light-dark-v7: #334155; /* Slate 700 - 卡片背景 */

    --white-v7: #ffffff;
    --light-text-v7: #cbd5e1; /* Slate 300 - 主要文字 */
    --medium-text-v7: #94a3b8; /* Slate 400 - 次要文字 */
    --dark-text-v7: #64748b; /* Slate 500 - 最浅文字/边框 */

    --border-color-v7: #475569; /* Slate 600 - 边框 */

    --footer-bg-v7: #020617; /* Slate 950 - 最深页脚 */
    --footer-text-v7: #94a3b8; /* Slate 400 */
    --footer-link-hover-v7: var(--primary-color-v7);

    /* V7 字体 */
    --font-primary-v7: 'Poppins', 'Noto Sans SC', sans-serif;
    --font-secondary-v7: 'Poppins', 'Noto Sans SC', sans-serif;

    /* V7 阴影 (暗色模式下通常不明显，可用边框或发光替代) */
    --shadow-sm-v7: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md-v7: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg-v7: 0 10px 20px rgba(0, 0, 0, 0.2);
    --glow-sm-v7: 0 0 8px rgba(45, 212, 191, 0.3); /* Primary color glow */
    --glow-md-v7: 0 0 15px rgba(45, 212, 191, 0.4);

    /* V7 圆角 (更锐利) */
    --border-radius-base-v7: 4px;
    --border-radius-lg-v7: 8px;

    --transition-v7: all 0.3s ease;
}

/* === V7 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-v7 {
    font-family: var(--font-primary-v7);
    line-height: 1.7;
    color: var(--light-text-v7); /* 默认浅色文字 */
    background-color: var(--bg-dark-v7); /* 深色背景 */
    opacity: 1;
    transition: none;
}

body.theme-v7.loaded {
    opacity: 1;
}

.container {
    width: 100%;
    max-width: 1160px; /* 调整容器宽度 */
    margin: 0 auto;
    padding: 0 1rem;
}

section {
    padding: 5.5rem 0;
    position: relative;
    overflow: hidden;
}

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

a {
    color: var(--primary-color-v7);
    text-decoration: none;
    transition: var(--transition-v7);
}

a:hover {
    color: var(--primary-light-v7);
}

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary-v7);
    color: var(--white-v7); /* 标题白色 */
    line-height: 1.35;
    font-weight: 600; /* 标题加粗 */
    letter-spacing: -0.2px;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-header h2 {
    font-size: 2.2rem;
    margin-bottom: 0.8rem;
    font-weight: 700;
}

.section-header p {
    font-size: 1rem;
    color: var(--medium-text-v7);
    max-width: 600px;
    margin: 0 auto;
}

/* === V7 按钮样式 (科技感) === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 2rem;
    border-radius: var(--border-radius-base-v7);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition-v7);
    cursor: pointer;
    border: 1px solid transparent;
    text-transform: uppercase; /* 大写 */
    letter-spacing: 0.8px;
    position: relative;
    overflow: hidden;
}

.btn i {
    margin-left: 0.7rem;
    font-size: 0.9rem;
}

/* V7 主按钮 - 亮色强调 */
.btn-primary {
    background-color: var(--primary-color-v7);
    color: var(--bg-dark-v7); /* 深色文字 */
    border-color: var(--primary-color-v7);
    box-shadow: var(--glow-sm-v7);
}

.btn-primary:hover {
    background-color: var(--primary-dark-v7);
    border-color: var(--primary-dark-v7);
    box-shadow: var(--glow-md-v7);
    transform: translateY(-2px);
}

/* V7 描边按钮 - 细线 */
.btn-outline {
    background: transparent;
    color: var(--primary-light-v7);
    border-color: var(--primary-color-v7);
}

.btn-outline:hover {
    background-color: rgba(45, 212, 191, 0.1); /* 主色背景 */
    color: var(--white-v7);
    border-color: var(--primary-light-v7);
}

/* === V7 导航栏 (暗色透明感) === */
.header-v7 {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.85); /* 半透明深色 */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 0.8rem 0;
    transition: var(--transition-v7);
    border-bottom: 1px solid var(--border-color-v7); /* 深色边框 */
    box-shadow: none;
}

.header-v7.scrolled {
    padding: 0.6rem 0;
    background-color: rgba(15, 23, 42, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.header-v7 .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-v7 .logo {
    display: flex;
    align-items: center;
}

.header-v7 .logo h1 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--white-v7);
    margin-left: 0.7rem;
}

.header-v7 .logo-icon {
    width: 34px;
    height: 34px;
    background: var(--primary-color-v7);
    border-radius: var(--border-radius-base-v7);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-dark-v7);
    font-size: 1.1rem;
    font-weight: 700;
    box-shadow: none;
}

.header-v7 .nav-links {
    display: flex;
    gap: 1.8rem;
}

.header-v7 .nav-links a {
    color: var(--medium-text-v7);
    font-weight: 400;
    position: relative;
    padding: 0.4rem 0;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.header-v7 .nav-links a i {
    display: none;
}

.header-v7 .nav-links a:hover,
.header-v7 .nav-links a.active {
    color: var(--primary-light-v7);
}

/* V7 Nav Link Hover - 边框动画 */
.header-v7 .nav-links a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    background: var(--primary-color-v7);
    bottom: -5px;
    left: 0;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.header-v7 .nav-links a:hover::after,
.header-v7 .nav-links a.active::after {
    transform: scaleX(1);
}

.header-v7 .mobile-menu {
    display: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--light-text-v7);
}

/* === V7 英雄区域 (未来感) === */
.hero-v7 {
    padding: 10rem 0 9rem;
    background: linear-gradient(180deg, var(--bg-dark-v7) 0%, var(--bg-medium-dark-v7) 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
    /* 可以加一些背景网格或粒子效果 */
}

/* 添加背景线条效果 */
.hero-v7::before {
    content: '';
    position: absolute;
    top: 0; left: 10%;
    width: 1px; height: 100%;
    background: linear-gradient(to bottom, transparent, var(--border-color-v7) 50%, transparent);
    opacity: 0.3;
}
.hero-v7::after {
    content: '';
    position: absolute;
    top: 0; right: 10%;
    width: 1px; height: 100%;
    background: linear-gradient(to bottom, transparent, var(--border-color-v7) 50%, transparent);
    opacity: 0.3;
}

.hero-v7 .hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-v7 .hero-content h1 {
    font-size: 3.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.25;
    color: var(--white-v7);
    text-shadow: 0 0 15px rgba(45, 212, 191, 0.2); /* 主色调光晕 */
}

.hero-v7 .hero-content h1 .highlight {
    color: var(--primary-color-v7);
}

.hero-v7 .hero-content p {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    color: var(--medium-text-v7);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-v7 .hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
}

/* === V7 关于我们 (深色背景) === */
.about-v7 {
    background-color: var(--bg-dark-v7);
}

.about-v7 .about-content {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 3.5rem;
    align-items: center;
}

.about-v7 .about-image {
    border-radius: var(--border-radius-lg-v7);
    overflow: hidden;
    border: 1px solid var(--border-color-v7);
    /* box-shadow: none; */
    position: relative;
}

.about-v7 .about-text h3 {
    font-size: 1.9rem;
    margin-bottom: 1rem;
    color: var(--white-v7);
    font-weight: 600;
}

.about-v7 .about-text p {
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: var(--light-text-v7);
}

/* V7 Stats */
.about-v7 .about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
    background-color: transparent;
    padding: 0;
    border: none;
}

.about-v7 .stat-item {
    text-align: left;
    padding: 1.2rem;
    border: 1px solid var(--border-color-v7);
    background-color: var(--bg-medium-dark-v7);
    border-radius: var(--border-radius-base-v7);
}

.about-v7 .stat-number {
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--primary-light-v7);
    margin-bottom: 0.2rem;
    line-height: 1.1;
}

.about-v7 .stat-text {
    font-size: 0.8rem;
    color: var(--medium-text-v7);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* === V7 产品展示 (暗色卡片) === */
.products-v7 {
    background-color: var(--bg-medium-dark-v7);
}

.products-v7 .product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.products-v7 .product-card {
    background: var(--bg-light-dark-v7); /* 卡片背景 */
    border-radius: var(--border-radius-lg-v7);
    overflow: hidden;
    box-shadow: none;
    transition: var(--transition-v7);
    border: 1px solid var(--border-color-v7);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

/* V7 卡片悬停 - 边框发光 */
.products-v7 .product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow-sm-v7);
    border-color: var(--primary-color-v7);
}

.products-v7 .product-image {
    height: 180px;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-medium-dark-v7);
}

.products-v7 .product-image img {
    opacity: 0.85; /* 图片稍暗 */
    transition: opacity 0.3s ease;
}
.products-v7 .product-card:hover .product-image img {
    opacity: 1;
}

.products-v7 .product-info {
    padding: 1.3rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.products-v7 .product-info h3 {
    font-size: 1.15rem;
    margin-bottom: 0.6rem;
    font-weight: 600;
    color: var(--white-v7);
}

.products-v7 .product-info p {
    color: var(--medium-text-v7);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.products-v7 .product-link {
    color: var(--primary-color-v7);
    font-weight: 500;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: auto;
    text-transform: uppercase;
}
.products-v7 .product-link:hover {
    color: var(--primary-light-v7);
    text-decoration: none;
}
.products-v7 .product-link:hover i {
    transform: translateX(4px);
}

/* === V7 服务项目 (线框图标) === */
.services-v7 {
    background-color: var(--bg-dark-v7);
}

.services-v7 .services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.services-v7 .service-card {
    background: transparent;
    border-radius: var(--border-radius-base-v7);
    padding: 1.8rem 1.5rem;
    text-align: center;
    box-shadow: none;
    transition: var(--transition-v7);
    border: 1px solid var(--border-color-v7);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.services-v7 .service-card:hover {
    transform: translateY(-3px);
    background-color: var(--bg-medium-dark-v7);
    border-color: var(--secondary-color-v7); /* 悬停用辅助色 */
}

.services-v7 .service-icon {
    width: 55px;
    height: 55px;
    background: transparent;
    border: 2px solid var(--secondary-color-v7); /* 辅助色边框 */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--secondary-color-v7); /* 辅助色图标 */
    transition: var(--transition-v7);
    margin-bottom: 1.2rem;
    box-shadow: none;
    flex-shrink: 0;
}

.services-v7 .service-card:hover .service-icon {
    background-color: var(--secondary-color-v7);
    color: var(--bg-dark-v7);
    transform: rotate(15deg);
}

.services-v7 .service-card .service-text-content {}

.services-v7 .service-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.6rem;
    font-weight: 500;
    color: var(--white-v7);
}

.services-v7 .service-card p {
    color: var(--medium-text-v7);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* === V7 新闻动态 (列表形式) === */
.news-v7 {
    background-color: var(--bg-medium-dark-v7);
}

.news-v7 .news-grid {
    display: grid;
    grid-template-columns: 1fr; /* 单列 */
    gap: 1.5rem;
}

.news-v7 .news-card {
    background-color: transparent;
    border-radius: 0;
    overflow: visible;
    box-shadow: none;
    transition: var(--transition-v7);
    border: none;
    border-bottom: 1px solid var(--border-color-v7); /* 分隔线 */
    height: auto;
    display: flex; /* 横向布局 */
    align-items: flex-start; /* 顶部对齐 */
    gap: 1.5rem;
    padding-bottom: 1.5rem;
}
.news-v7 .news-card:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.news-v7 .news-card:hover {
    /* transform: translateX(5px); */ /* 可选 */
    background-color: rgba(45, 212, 191, 0.05); /* 主色调半透明背景 */
}

.news-v7 .news-image {
    height: 80px;
    width: 120px;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-light-dark-v7);
    border-radius: var(--border-radius-base-v7);
    flex-shrink: 0;
}
.news-v7 .news-image img {
    object-fit: cover;
    width: 100%;
    height: 100%;
}

.news-v7 .news-content {
    padding: 0;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-self: stretch; /* 撑满高度 */
}

.news-v7 .news-title {
    font-size: 1.05rem;
    font-weight: 500;
    margin-bottom: 0.4rem;
    line-height: 1.4;
}

.news-v7 .news-title a {
    color: var(--light-text-v7);
    transition: var(--transition-v7);
}

.news-v7 .news-title a:hover {
    color: var(--primary-color-v7);
}

.news-v7 .news-excerpt {
    font-size: 0.85rem;
    color: var(--medium-text-v7);
    margin-bottom: 0.8rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    /* flex-grow: 1; */
}

.news-v7 .news-meta {
    display: flex;
    /* justify-content: space-between; */
    align-items: center;
    font-size: 0.75rem;
    color: var(--dark-text-v7); /* 最浅文字 */
    margin-top: auto; /* 推到底部 */
    gap: 1rem;
}

.news-v7 .news-date {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.news-v7 .news-category {
    background-color: var(--bg-light-dark-v7);
    color: var(--medium-text-v7);
    padding: 2px 8px;
    font-weight: 400;
    border-radius: var(--border-radius-base-v7);
    font-size: 0.7rem;
    border: none;
}

.news-v7 .news-readmore {
    color: var(--secondary-color-v7); /* 辅助色 */
    font-size: 0.8rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-left: auto; /* 推到右侧 */
}

.news-v7 .news-readmore:hover {
    color: var(--primary-light-v7);
    text-decoration: none;
}

.news-v7 .news-readmore:hover i {
    transform: translateX(3px);
}

/* === V7 联系我们 (深色表单) === */
.contact-v7 {
    background-color: var(--bg-dark-v7);
    padding-bottom: 6rem;
}

.contact-v7 .contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: flex-start;
}

.contact-v7 .contact-form {
    background: var(--bg-medium-dark-v7);
    border-radius: var(--border-radius-lg-v7);
    padding: 2.5rem;
    box-shadow: none;
    border: 1px solid var(--border-color-v7);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.contact-v7 .form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.contact-v7 .form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--medium-text-v7);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-v7 .form-group input,
.contact-v7 .form-group textarea {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 1px solid var(--border-color-v7);
    border-radius: var(--border-radius-base-v7);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-v7);
    background-color: var(--bg-dark-v7); /* 输入框更深 */
    color: var(--light-text-v7);
}

.contact-v7 .form-group input::placeholder,
.contact-v7 .form-group textarea::placeholder {
    color: var(--dark-text-v7);
    opacity: 0.8;
}

.contact-v7 .form-group input:focus,
.contact-v7 .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color-v7);
    box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.2);
    background-color: var(--bg-medium-dark-v7);
}

.contact-v7 .form-group textarea {
    height: 120px;
    resize: vertical;
}

.contact-v7 .contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding-top: 1rem;
}

.contact-v7 .info-item {
    background: transparent;
    border-radius: 0;
    padding: 1rem 0;
    box-shadow: none;
    border: none;
    border-bottom: 1px dashed var(--border-color-v7); /* 虚线分隔 */
    transition: none;
    position: relative;
    overflow: visible;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 1rem;
}
.contact-v7 .info-item:last-child {
    border-bottom: none;
}

.contact-v7 .info-icon {
    width: 40px;
    height: 40px;
    background: transparent;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--secondary-color-v7); /* 辅助色图标 */
    margin-bottom: 0;
    box-shadow: none;
    transition: var(--transition-v7);
    flex-shrink: 0;
    border: 1px solid var(--secondary-color-v7);
}

.contact-v7 .info-item-content {}

.contact-v7 .info-item h3 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
    color: var(--white-v7);
    font-weight: 500;
}

.contact-v7 .info-item p {
    color: var(--medium-text-v7);
    margin-bottom: 0.1rem;
    font-size: 0.9rem;
    display: block;
    line-height: 1.5;
}

.contact-v7 .info-item p i { display: none; }

/* === V7 友情链接 (弱化) === */
.friend-links-v7 {
    background-color: var(--bg-dark-v7);
    padding: 3rem 0;
    border-top: 1px solid var(--border-color-v7);
}

.friend-links-v7 .section-header {
    margin-bottom: 2rem;
}
.friend-links-v7 .section-header h2 {
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--medium-text-v7);
}
.friend-links-v7 .section-header p { display: none; }

.friend-links-v7 .links-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.friend-links-v7 .links-grid a {
    color: var(--medium-text-v7);
    font-size: 0.9rem;
    padding: 0;
    border-radius: 0;
    transition: var(--transition-v7);
    background-color: transparent;
    border: none;
    opacity: 0.7;
}

.friend-links-v7 .links-grid a:hover {
    color: var(--primary-light-v7);
    opacity: 1;
}

/* === V7 页脚 (深黑) === */
.footer-v7 {
    background-color: var(--footer-bg-v7);
    color: var(--footer-text-v7);
    padding: 4rem 0 1.5rem;
    position: relative;
    overflow: hidden;
    border-top: 1px solid var(--border-color-v7);
}

.footer-v7 .footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
    position: relative;
    z-index: 1;
}

.footer-v7 .footer-content h3 {
    font-size: 1rem;
    margin-bottom: 0.8rem;
    color: var(--light-text-v7); /* 页脚标题稍亮 */
    position: relative;
    padding-bottom: 0.5rem;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color-v7);
}

.footer-v7 .footer-about p {
    color: var(--footer-text-v7);
    font-size: 0.85rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.footer-v7 .social-icons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.footer-v7 .social-icons a {
    width: 34px;
    height: 34px;
    background: transparent;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--medium-text-v7);
    transition: var(--transition-v7);
    font-size: 1rem;
    border: 1px solid var(--border-color-v7);
}

.footer-v7 .social-icons a:hover {
    color: var(--primary-color-v7);
    border-color: var(--primary-color-v7);
    background-color: rgba(45, 212, 191, 0.1);
}

.footer-v7 .footer-links ul li {
    margin-bottom: 0.4rem;
}

.footer-v7 .footer-links a {
    color: var(--footer-text-v7);
    transition: var(--transition-v7);
    display: inline-flex;
    align-items: center;
    font-size: 0.85rem;
    opacity: 0.7;
}

.footer-v7 .footer-links a:hover {
    color: var(--footer-link-hover-v7);
    opacity: 1;
    text-decoration: none;
    transform: translateX(3px);
}

.footer-v7 .footer-contact p {
    color: var(--footer-text-v7);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.85rem;
    opacity: 0.7;
}

.footer-v7 .footer-contact i {
    color: var(--secondary-color-v7);
    margin-top: 0.2em;
    width: 14px;
    text-align: center;
    flex-shrink: 0;
    opacity: 0.8;
}

.footer-v7 .footer-bottom {
    border-top: 1px solid var(--border-color-v7);
    padding-top: 1.5rem;
    text-align: center;
    color: var(--dark-text-v7); /* 最浅文字 */
    font-size: 0.8rem;
}

.footer-v7 .footer-bottom a {
    color: var(--medium-text-v7);
    font-weight: 400;
}
.footer-v7 .footer-bottom a:hover {
    color: var(--primary-light-v7);
}

/* === V7 回到顶部按钮 === */
.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-base-v7);
    background: var(--primary-color-v7);
    color: var(--bg-dark-v7);
    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(--glow-sm-v7);
}

.scroll-top-btn.visible {
    opacity: 0.8;
    visibility: visible;
    transform: translateY(0);
}
.scroll-top-btn.visible:hover {
    opacity: 1;
}

.scroll-top-btn:hover {
    background-color: var(--primary-dark-v7);
    transform: translateY(-2px);
    box-shadow: var(--glow-md-v7);
}

/* === V7 响应式调整 === */
@media (max-width: 992px) {
    .header-v7 .nav-links { display: none; }
    .header-v7 .mobile-menu { display: block; }
    .about-v7 .about-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .about-v7 .about-text {
        order: -1;
    }
    .contact-v7 .contact-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .footer-v7 .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    .news-v7 .news-card {
        flex-direction: column; /* 移动端改垂直 */
        gap: 1rem;
    }
    .news-v7 .news-image {
        width: 100%;
        height: 150px;
    }
}

@media (max-width: 768px) {
    /* Mobile Nav Styles - V7 */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 280px;
        height: 100vh;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        background: var(--bg-medium-dark-v7);
        padding: 5rem 0 2rem;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
        transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1001;
        gap: 0;
        border-left: 1px solid var(--border-color-v7);
    }
    .nav-links.active {
        right: 0;
    }
    .nav-links li {
        margin: 0;
        width: 100%;
    }
    .nav-links a {
        display: flex;
        align-items: center;
        padding: 0.9rem 1.5rem;
        font-size: 0.95rem;
        color: var(--light-text-v7);
        font-weight: 400;
        border-bottom: 1px solid var(--border-color-v7);
        width: 100%;
        border-radius: 0;
        text-transform: none;
        letter-spacing: 0;
    }
    .nav-links a i {
        display: inline-block;
        margin-right: 1rem;
        width: 20px;
        text-align: center;
        color: var(--primary-color-v7);
        font-size: 1rem;
    }
    .nav-links a.active, .nav-links a:hover {
        color: var(--primary-color-v7);
        background-color: var(--bg-dark-v7);
    }
    .nav-links a::after { display: none; }

    .overlay {
        background: rgba(0, 0, 0, 0.6); /* 深色遮罩 */
        /* ... rest of overlay styles */
    }
    .overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .hero-v7 .hero-content h1 {
        font-size: 2.8rem;
    }
    .hero-v7 .hero-content p {
        font-size: 1rem;
    }
    .section-header h2 {
        font-size: 2rem;
    }
    .services-v7 .service-card {
        padding: 1.5rem 1rem;
    }
    .contact-v7 .info-item {
        gap: 1rem;
    }
}

@media (max-width: 576px) {
    section {
        padding: 4.5rem 0;
    }
    .container {
        padding: 0 1rem;
    }
    .hero-v7 .hero-content h1 {
        font-size: 2.3rem;
    }
    .hero-v7 .hero-content p {
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }
    .hero-v7 .hero-buttons {
        flex-direction: column;
        gap: 1rem;
    }
    .hero-v7 .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
        padding: 0.8rem 1.5rem;
    }
    .about-v7 .about-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .footer-v7 .footer-content {
        grid-template-columns: 1fr;
        gap: 1.8rem;
        text-align: center;
    }
    .footer-v7 .footer-content h3 {
        border-bottom: 1px solid var(--border-color-v7);
        padding-bottom: 0.4rem;
        margin-bottom: 0.6rem;
        text-align: center;
    }
    .footer-v7 .footer-content h3::after { display: none; }

    .footer-v7 .footer-about .social-icons {
        justify-content: center;
    }
    .footer-v7 .footer-links ul {
        padding-left: 0;
    }
    .footer-v7 .footer-contact p {
        justify-content: center;
        text-align: center;
    }
    .footer-v7 .footer-bottom {
        font-size: 0.75rem;
        padding-top: 1.5rem;
    }
    .contact-v7 .contact-form {
        padding: 2rem 1.5rem;
    }
}


/* === V7 自定义滚动条 === */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-medium-dark-v7);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color-v7);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--dark-text-v7);
}