/* 根变量定义 */
:root {
    --primary-color: #0D1B2A;
    --secondary-color: #1B263B;
    --accent-color: #00D2FF;
    --gradient-blue: linear-gradient(135deg, #1B263B 0%, #415A77 100%);
    --text-primary: #FFFFFF;
    --text-secondary: #8B9DC3;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 25px rgba(0, 210, 255, 0.15);
    
    /* 统一图标系统变量 */
    --icon-size-xs: 1rem;      /* 16px - 小图标 */
    --icon-size-sm: 1.25rem;   /* 20px - 标签图标 */
    --icon-size-md: 1.5rem;    /* 24px - 标准图标 */
    --icon-size-lg: 2rem;      /* 32px - 大图标 */
    --icon-size-xl: 2.5rem;    /* 40px - 特大图标 */
    --icon-size-xxl: 3rem;     /* 48px - 超大图标 */
    
    /* 图标颜色系统 */
    --icon-color-primary: var(--accent-color);
    --icon-color-secondary: var(--text-secondary);
    --icon-color-accent: #00FFFF;
    --icon-color-success: #00FF88;
    --icon-color-warning: #FFB800;
    --icon-color-future: #8A2BE2;
    
    /* 图标效果 */
    --icon-glow: 0 0 10px rgba(0, 210, 255, 0.3);
    --icon-glow-hover: 0 0 15px rgba(0, 210, 255, 0.5);
    --icon-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 统一图标基础样式 */
.icon-base {
    display: inline-block;
    transition: var(--icon-transition);
    filter: drop-shadow(var(--icon-glow));
    line-height: 1;
}

.icon-base:hover {
    filter: drop-shadow(var(--icon-glow-hover));
    transform: scale(1.1);
}

/* 图标尺寸类 */
.icon-xs { font-size: var(--icon-size-xs); }
.icon-sm { font-size: var(--icon-size-sm); }
.icon-md { font-size: var(--icon-size-md); }
.icon-lg { font-size: var(--icon-size-lg); }
.icon-xl { font-size: var(--icon-size-xl); }
.icon-xxl { font-size: var(--icon-size-xxl); }

/* 图标颜色类 */
.icon-primary { color: var(--icon-color-primary); }
.icon-secondary { color: var(--icon-color-secondary); }
.icon-accent { color: var(--icon-color-accent); }
.icon-success { color: var(--icon-color-success); }
.icon-warning { color: var(--icon-color-warning); }
.icon-future { color: var(--icon-color-future); }

/* 图标容器样式 */
.icon-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--icon-transition);
}

.icon-container-sm {
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(0, 210, 255, 0.1);
    border: 1px solid rgba(0, 210, 255, 0.2);
}

.icon-container-md {
    width: 3.5rem;
    height: 3.5rem;
    background: rgba(0, 210, 255, 0.1);
    border: 1px solid rgba(0, 210, 255, 0.2);
}

.icon-container-lg {
    width: 5rem;
    height: 5rem;
    background: rgba(0, 210, 255, 0.1);
    border: 2px solid rgba(0, 210, 255, 0.2);
}

.icon-container:hover {
    background: rgba(0, 210, 255, 0.2);
    border-color: rgba(0, 210, 255, 0.4);
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(0, 210, 255, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--primary-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(13, 27, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.logo-placeholder {
    filter: drop-shadow(var(--icon-glow));
    transition: var(--icon-transition);
    display: flex;
    align-items: center;
}

.logo-image{
    height: 64px;
    width: auto;
}

.logo-placeholder:hover {
    filter: drop-shadow(var(--icon-glow-hover));
    transform: scale(1.1);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    font-weight: 500;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 3px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--gradient-blue);
    overflow: hidden;
}

.particles-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--text-primary), var(--accent-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: hero-animation 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: hero-animation 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) 0.2s forwards;
    opacity: 0;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: hero-animation 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) 0.4s forwards;
    opacity: 0;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: hero-animation 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) 0.6s forwards;
    opacity: 0;
}

.btn-primary, .btn-secondary {
    padding: 12px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    display: inline-block;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 210, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--accent-color);
}

.btn-secondary:hover {
    background: var(--accent-color);
    color: var(--primary-color);
}

/* 统计区域样式 */
.stats-section {
    padding: 80px 0;
    background: var(--secondary-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* 区域通用样式 */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 产品展示区域 */
.products-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    position: relative;
    overflow: hidden;
}

/* 全屏产品展示 */
.products-section.fullscreen {
    min-height: 100vh;
    padding: 2rem 0;
    display: flex;
    align-items: center;
}

.fullscreen-container {
    width: 95%;
    max-width: 100vw;
    padding: 0 2rem;
    margin: 0 auto;
}

.products-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(0, 210, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 210, 255, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

/* 产品介绍头部 */
.product-intro {
    text-align: center;
    margin-bottom: 5rem;
    position: relative;
    z-index: 2;
}

/* 全屏模式下的产品介绍 */
.fullscreen .product-intro {
    margin-bottom: 3rem;
}

.intro-badge {
    display: inline-block;
    background: rgba(0, 210, 255, 0.1);
    color: var(--accent-color);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(0, 210, 255, 0.3);
}

.intro-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.intro-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 产品展示主体 */
.product-display {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 6rem;
    align-items: center;
    margin-bottom: 3rem;
    position: relative;
    z-index: 2;
}

/* 全屏模式下的产品展示 */
.fullscreen .product-display {
    margin-bottom: 2rem;
}

/* 左侧产品信息 */
.product-summary {
    max-width: 400px;
}

.product-title {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.title-icon {
    font-size: var(--icon-size-xl);
    color: var(--icon-color-primary);
    filter: drop-shadow(var(--icon-glow));
    transition: var(--icon-transition);
}

.title-icon:hover {
    filter: drop-shadow(var(--icon-glow-hover));
    transform: scale(1.1);
}

.product-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.key-features {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 2.5rem;
}

.feature-tag {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.6rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    font-size: 0.95rem;
    color: var(--text-primary);
    height: 80px;
    font-size: large;
    margin-bottom: 15px;
}

.feature-tag:hover {
    background: rgba(0, 210, 255, 0.1);
    border-color: rgba(0, 210, 255, 0.3);
    transform: translateX(5px);
}

.tag-icon {
    font-size: var(--icon-size-sm);
    color: var(--icon-color-primary);
    transition: var(--icon-transition);
    filter: drop-shadow(var(--icon-glow));
}

.tag-icon:hover {
    filter: drop-shadow(var(--icon-glow-hover));
    transform: scale(1.1);
}

.product-cta {
    display: flex;
    gap: 1rem;
}

.cta-primary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--accent-color);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-primary:hover {
    background: rgba(0, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 210, 255, 0.3);
}

.cta-secondary {
    display: flex;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.cta-arrow {
    transition: transform 0.3s ease;
}

.cta-primary:hover .cta-arrow {
    transform: translateX(5px);
}

/* 右侧大图展示 */
.product-showcase {
    position: relative;
}

.showcase-container {
    position: relative;
}

/* 图片切换指示器 */
.image-indicators {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    justify-content: center;
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.indicator.active {
    background: var(--accent-color);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.6);
}

.indicator:hover:not(.active) {
    background: rgba(255, 255, 255, 0.7);
    transform: scale(1.2);
}

/* 图片展示区域 */
.image-display {
    position: relative;
    width: 100%;
    height: 500px;
    border-radius: 16px;
    overflow: hidden;
}

/* 全屏模式下的图片展示 */
.fullscreen .image-display {
    height: 55vh;
    min-height: 400px;
    max-height: 600px;
}

.image-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transform: scale(0.95);
    transition: all 0.5s ease;
}

.image-wrapper.active {
    opacity: 1;
    transform: scale(1);
}

.showcase-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

/* 装饰效果 */
.showcase-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
}

.deco-circle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(45deg, rgba(0, 210, 255, 0.1), rgba(0, 255, 255, 0.05));
    animation: float 8s ease-in-out infinite;
}

.deco-1 {
    width: 80px;
    height: 80px;
    top: -20px;
    right: -20px;
    animation-delay: 0s;
}

.deco-2 {
    width: 60px;
    height: 60px;
    bottom: -10px;
    left: -10px;
    animation-delay: 3s;
}

.deco-line {
    position: absolute;
    width: 2px;
    height: 100px;
    background: linear-gradient(to bottom, transparent, var(--accent-color), transparent);
    top: 50%;
    right: -50px;
    transform: translateY(-50%);
    opacity: 0.3;
    animation: pulse 4s ease-in-out infinite;
}

/* 底部统计数据 */
.product-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
    position: relative;
    z-index: 2;
}

/* 全屏模式下的统计数据 */
.fullscreen .product-stats {
    margin-top: 4rem;
    margin-bottom: 2rem;
}

.stat-item {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(15px);
    border-radius: 16px;
    padding: 2rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(0, 210, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 210, 255, 0.15);
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent-color);
    display: block;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* 动画效果 */
@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* 技术能力区域 */
.technology-section {
    padding: 80px 0;
    background: var(--secondary-color);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.tech-card {
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    transition: var(--transition);
}

.tech-card:hover {
    /* 悬停效果已合并到 .glass-card 中 */
}

.tech-icon {
    font-size: var(--icon-size-xxl);
    color: var(--icon-color-primary);
    margin-bottom: 1rem;
    display: block;
    transition: var(--icon-transition);
    filter: drop-shadow(var(--icon-glow));
}

.tech-icon:hover {
    filter: drop-shadow(var(--icon-glow-hover));
    transform: scale(1.1);
}

.tech-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

/* 解决方案区域 */
.solutions-section {
    padding: 80px 0;
    background: var(--primary-color);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.solution-card {
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    transition: var(--transition);
}

.solution-card:hover {
    /* 悬停效果已合并到 .glass-card 中 */
}

.solution-icon {
    font-size: var(--icon-size-xxl);
    color: var(--icon-color-primary);
    margin-bottom: 1rem;
    display: block;
    transition: var(--icon-transition);
    filter: drop-shadow(var(--icon-glow));
}

.solution-icon:hover {
    filter: drop-shadow(var(--icon-glow-hover));
    transform: scale(1.1);
}

.solution-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

/* 关于我们区域 */
.about-section {
    padding: 80px 0;
    background: var(--secondary-color);
    backdrop-filter: blur(10px);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-align: center;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.mission-vision {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.mission, .vision {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mission h3, .vision h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.mission p, .vision p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.about-cta {
    text-align: center;
    margin-top: 2.5rem;
}

.about-cta .btn-secondary {
    display: inline-block;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.8rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.about-cta .btn-secondary:hover {
    background: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 210, 255, 0.3);
}

/* 联系我们区域 */
.contact-section {
    padding: 80px 0;
    background: var(--primary-color);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.contact-icon {
    font-size: var(--icon-size-lg);
    color: var(--icon-color-primary);
    transition: var(--icon-transition);
    filter: drop-shadow(var(--icon-glow));
}

.contact-icon:hover {
    filter: drop-shadow(var(--icon-glow-hover));
    transform: scale(1.1);
}

.contact-text h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.contact-text a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

.contact-text a:hover {
    text-decoration: underline;
}

/* 页脚样式 */
.footer {
    background: var(--secondary-color);
    padding: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    padding: 60px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* --- Left: Brand Info --- */
.footer-brand-section {
    max-width: 350px;
}

.footer-logo-image {
    height: 64px;
    width: auto;
    /*margin-bottom: 1.5rem;*/
}

.brand-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
}

.brand-description,
.brand-slogan {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.brand-description {
    color: var(--text-primary);
    font-weight: 500;
}

/* --- Right: Contacts --- */
.footer-contact-section {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
}

.nav-group h4,
.qr-section h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.nav-group h4::after,
.qr-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent-color);
}

.nav-group ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-group li {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.nav-group a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.nav-group a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.qr-section {
    text-align: left;
}

.qr-code {
    width: 100px;
    height: 100px;
    margin-bottom: 1rem;
    border-radius: 8px;
    overflow: hidden;
    background: #ffffff;
    padding: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

.qr-code img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

.qr-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

/* --- Footer Bottom --- */
.footer-bottom {
    padding: 2rem 0;
    text-align: center;
}

.copyright {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    opacity: 0.7;
}

.copyright span,
.copyright a {
    text-align: center;
}

.icp-link {
    color: var(--text-secondary);
    text-decoration: none;
    position: relative;
    transition: var(--transition);
}

.icp-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--accent-color);
    transform: scaleX(0);
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.icp-link:hover {
    color: var(--accent-color);
    opacity: 1;
}

.icp-link:hover::after {
    transform: scaleX(1);
}

@media (max-width: 768px) {
    .copyright .divider {
        display: none;
    }
    .copyright {
        flex-direction: column;
        gap: 0.3rem;
    }
}

/* CTA样式 */
.contact-cta {
    padding: 100px 0;
    background: var(--primary-color);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background-color: rgba(0, 210, 255, 0.15);
    border: 1px solid rgba(0, 210, 255, 0.3);
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.2rem;
    text-decoration: none;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 210, 255, 0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: rgba(0, 210, 255, 0.3);
    color: #fff;
    transform: translateY(-3px) scale(1.05);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: #00B8E6;
}