/* ==================== 顶级品牌版 - 极致品质 ==================== */

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

:root {
    /* 顶级品牌配色 - 参考 Apple */
    --primary: #0071e3;
    --primary-light: #2997ff;
    --primary-dark: #0055b3;
    --secondary: #5e5ce6;
    --accent: #30d158;
    --accent-orange: #ff9f0a;
    --accent-pink: #ff375f;
    
    /* 精致中性色 - 更细腻的灰度 */
    --gray-50: #fafafa;
    --gray-75: #f5f5f7;
    --gray-100: #f0f0f0;
    --gray-200: #e8e8ed;
    --gray-300: #d2d2d7;
    --gray-400: #a1a1a6;
    --gray-500: #86868b;
    --gray-600: #6e6e73;
    --gray-700: #515154;
    --gray-800: #1d1d1f;
    --gray-900: #000000;
    
    /* 纯色系 */
    --white: #ffffff;
    --black: #000000;
    
    /* 高级渐变 - 更自然的过渡 */
    --gradient-elegant: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-blue: linear-gradient(135deg, #0071e3 0%, #5e5ce6 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(0, 113, 227, 0.05) 0%, rgba(94, 92, 230, 0.05) 100%);
    --gradient-hover: linear-gradient(135deg, rgba(0, 113, 227, 0.08) 0%, rgba(94, 92, 230, 0.08) 100%);
    --gradient-hero: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(250, 250, 250, 0.8) 100%);
    
    /* 多层次阴影系统 - Apple 风格 */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.06), 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 8px 0 rgba(0, 0, 0, 0.08), 0 2px 4px 0 rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 8px 16px 0 rgba(0, 0, 0, 0.1), 0 4px 8px 0 rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 16px 32px 0 rgba(0, 0, 0, 0.12), 0 8px 16px 0 rgba(0, 0, 0, 0.06);
    --shadow-2xl: 0 24px 48px 0 rgba(0, 0, 0, 0.15), 0 12px 24px 0 rgba(0, 0, 0, 0.08);
    --shadow-3xl: 0 32px 64px 0 rgba(0, 0, 0, 0.18), 0 16px 32px 0 rgba(0, 0, 0, 0.1);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.04);
    
    /* 彩色阴影 - 品牌特色 */
    --shadow-primary: 0 8px 24px 0 rgba(0, 113, 227, 0.15), 0 4px 12px 0 rgba(0, 113, 227, 0.08);
    --shadow-primary-lg: 0 16px 40px 0 rgba(0, 113, 227, 0.2), 0 8px 20px 0 rgba(0, 113, 227, 0.12);
    
    /* 精致间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    --space-4xl: 8rem;
    
    /* 圆角系统 - 更统一 */
    --radius-sm: 0.375rem;
    --radius-md: 0.625rem;
    --radius-lg: 0.875rem;
    --radius-xl: 1.125rem;
    --radius-2xl: 1.375rem;
    --radius-3xl: 1.75rem;
    --radius-full: 9999px;
    
    /* 高级过渡 - Apple 标准曲线 */
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 600ms cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-smooth: 500ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    
    /* 模糊效果 */
    --blur-sm: 8px;
    --blur-md: 16px;
    --blur-lg: 24px;
    --blur-xl: 40px;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    /* 优先使用Inter，回退到优质中文字体 */
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Source Han Sans CN', 'Noto Sans CJK SC', 'Segoe UI', system-ui, sans-serif;
    font-size: 17px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
    overflow-x: hidden;
    /* 页面加载淡入动画 */
    opacity: 0;
    animation: pageLoadFadeIn 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.1s forwards;
    letter-spacing: -0.005em;
}

/* 优化文本渲染 */
body {
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

/* 页面加载淡入动画 - 更优雅 */
@keyframes pageLoadFadeIn {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
        filter: blur(4px);
    }
    50% {
        opacity: 0.5;
        filter: blur(2px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

/* ==================== 页面加载进度条 ==================== */
#loading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-blue);
    z-index: 10000;
    transition: width 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 0 20px rgba(0, 113, 227, 0.6), 0 0 40px rgba(0, 113, 227, 0.3);
}

#loading-progress.complete {
    width: 100%;
    opacity: 0;
    transition: width 0.3s ease, opacity 0.5s ease 0.3s;
}

/* ==================== 自定义滚动条 ==================== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 6px;
    border: 3px solid var(--white);
    transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-600);
}

::-webkit-scrollbar-thumb:active {
    background: var(--gray-700);
}

/* Firefox 滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) var(--gray-100);
}

/* ==================== 容器 ==================== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==================== 顶级导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(var(--blur-lg));
    -webkit-backdrop-filter: saturate(180%) blur(var(--blur-lg));
    border-bottom: 0.5px solid rgba(0, 0, 0, 0.05);
    transition: transform var(--transition-smooth),
                background var(--transition-base),
                box-shadow var(--transition-base),
                border-color var(--transition-base),
                opacity var(--transition-smooth);
    /* 初始状态：隐藏在上方 */
    transform: translateY(-100%);
    opacity: 0;
}

/* 显示导航栏 */
.navbar.visible {
    transform: translateY(0);
    opacity: 1;
}

/* 导航栏背景增强 */
.navbar.scrolled {
    background: rgba(255, 255, 255, 0.88);
    box-shadow: var(--shadow-sm);
    border-bottom-color: rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--gray-900);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
}

.logo::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-blue);
    border-radius: 1px;
    transition: width var(--transition-base);
}

.logo:hover {
    color: var(--primary);
    transform: translateY(-1px);
}

.logo:hover::after {
    width: 100%;
}

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

.nav-menu a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    text-decoration: none;
    transition: color var(--transition-base), transform var(--transition-fast);
    position: relative;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
}

/* 精致的悬停效果 */
.nav-menu a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-subtle);
    opacity: 0;
    border-radius: var(--radius-md);
    transition: opacity var(--transition-base);
    z-index: -1;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0.25rem;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
    transition: width var(--transition-base), left var(--transition-base);
}

.nav-menu a:hover {
    color: var(--gray-900);
    transform: translateY(-1px);
}

.nav-menu a:hover::before {
    opacity: 1;
}

.nav-menu a:hover::after {
    width: calc(100% - 1.5rem);
    left: 0.75rem;
}

.nav-menu a:active {
    transform: translateY(0);
}

/* Focus状态 - 键盘导航友好 */
.nav-menu a:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

/* ==================== 移动端汉堡菜单 ==================== */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
    transition: transform var(--transition-base);
}

.mobile-menu-toggle:hover {
    transform: scale(1.05);
}

.mobile-menu-toggle:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
    border-radius: 4px;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: var(--gray-900);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

/* 菜单打开时的汉堡动画 */
.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(10px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: translateX(-20px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-10px) rotate(-45deg);
}

/* 移动端全屏菜单遮罩 */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 2rem;
}

.mobile-nav-menu {
    list-style: none;
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease 0.2s, transform 0.5s ease 0.2s;
}

.mobile-menu-overlay.active .mobile-nav-menu {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav-menu li {
    margin: 2rem 0;
}

.mobile-nav-link {
    font-size: 2rem;
    font-weight: 600;
    color: white;
    text-decoration: none;
    display: inline-block;
    position: relative;
    padding: 0.5rem 1rem;
    transition: color var(--transition-base);
}

.mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

.mobile-nav-link:hover,
.mobile-nav-link:focus {
    color: var(--primary-light);
}

.mobile-nav-link:hover::after,
.mobile-nav-link:focus::after {
    width: 80%;
}

/* 移动端菜单显示控制 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
}

/* ==================== Hero区域 ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, var(--white) 0%, var(--gray-75) 100%);
    position: relative;
    overflow: hidden;
    /* 完全沉浸式，不需要padding */
}

/* 精致的背景装饰 - 更细腻的光效 */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle at center, rgba(0, 113, 227, 0.12) 0%, rgba(94, 92, 230, 0.06) 40%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite, pulse 8s ease-in-out infinite;
    filter: blur(80px);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(94, 92, 230, 0.1) 0%, rgba(48, 209, 88, 0.04) 40%, transparent 70%);
    border-radius: 50%;
    animation: float 25s ease-in-out infinite reverse, pulse 10s ease-in-out infinite 2s;
    filter: blur(80px);
}

@keyframes float {
    0%, 100% { 
        transform: translate(0, 0) scale(1) rotate(0deg);
    }
    33% { 
        transform: translate(-30px, -30px) scale(1.08) rotate(5deg);
    }
    66% {
        transform: translate(20px, -40px) scale(0.95) rotate(-3deg);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 0 2rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    line-height: 1.05;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
    transition: opacity 0.1s linear !important, transform 0.1s ease-out !important, visibility 0s linear 0.1s !important;
    will-change: opacity, transform;
}

.hero-title br {
    display: block;
}

.hero-subtitle {
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--gray-600);
    line-height: 1.5;
    margin-bottom: 3rem;
    animation: fadeInUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.2s both;
    letter-spacing: -0.01em;
    transition: opacity 0.1s linear !important, transform 0.1s ease-out !important, visibility 0s linear 0.1s !important;
    will-change: opacity, transform;
}

/* 磁吸按钮效果 */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.25rem;
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--white);
    background: var(--primary);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: opacity 0.1s linear !important, transform var(--transition-smooth) !important, box-shadow var(--transition-smooth) !important, visibility 0s linear 0.1s !important;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.4s both;
    position: relative;
    overflow: hidden;
    letter-spacing: -0.01em;
    will-change: opacity, transform;
}

.cta-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-blue);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.cta-button:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-primary-lg);
}

.cta-button:hover::before {
    opacity: 1;
}

.cta-button span {
    position: relative;
    z-index: 1;
}

.cta-button:active {
    transform: translateY(0) scale(0.98);
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
        filter: blur(6px);
    }
    60% {
        opacity: 0.8;
        filter: blur(2px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

/* ==================== 区块标题 ==================== */
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    text-align: center;
    color: var(--gray-900);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
    width: 100%;
}

/* 添加标题装饰 */
.section-title::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(0, 113, 227, 0.03) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.section-title:hover::before {
    opacity: 1;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    text-align: center;
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

/* ==================== 业务板块 ==================== */
.business {
    padding: 8rem 0;
    background: white;
}

.business .section-title {
    padding-top: 2rem;
}

.business .section-subtitle {
    margin-bottom: 5rem;
    padding-bottom: 1rem;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

/* 高级卡片设计 */
.business-card {
    background: var(--white);
    border: 0.5px solid var(--gray-200);
    border-radius: var(--radius-2xl);
    padding: 3rem;
    transition: all var(--transition-smooth);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transform-style: preserve-3d;
    perspective: 1000px;
}

/* 渐变边框效果 */
.business-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-2xl);
    padding: 1px;
    background: var(--gradient-blue);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.business-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-subtle);
    opacity: 0;
    transition: opacity var(--transition-base);
    border-radius: var(--radius-2xl);
}

.business-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-2xl);
    border-color: transparent;
}

.business-card:hover::before {
    opacity: 1;
}

.business-card:hover::after {
    opacity: 1;
}

.business-card > * {
    position: relative;
    z-index: 1;
}

.icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    transition: transform var(--transition-spring);
    animation: breathe 3s ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.business-card:hover .icon {
    transform: scale(1.15) rotate(-8deg);
    animation: none;
}

.business-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    transition: color var(--transition-base);
}

.business-card:hover h3 {
    color: var(--primary);
}

.business-card p {
    font-size: 1rem;
    color: var(--gray-600);
    line-height: 1.7;
    transition: color var(--transition-base);
}

.business-card:hover p {
    color: var(--gray-700);
}

/* ==================== 产品展示 ==================== */
.products {
    padding: 6rem 0;
    background: var(--gray-50);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

/* 精致产品卡片 */
.product-card {
    background: var(--white);
    border: 0.5px solid var(--gray-200);
    border-radius: var(--radius-2xl);
    padding: 2.5rem;
    transition: all var(--transition-smooth);
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: var(--shadow-sm);
    transform-style: preserve-3d;
    perspective: 1000px;
}

.product-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-hover);
    opacity: 0;
    border-radius: var(--radius-2xl);
    transition: opacity var(--transition-base);
}

.product-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-primary);
    border-color: rgba(0, 113, 227, 0.2);
}

.product-card:hover::before {
    opacity: 1;
}

.product-card > * {
    position: relative;
    z-index: 1;
}

.product-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background: var(--gradient-subtle);
    border-radius: var(--radius-xl);
    margin-bottom: 1.5rem;
    transition: all var(--transition-spring);
    animation: float-icon 4s ease-in-out infinite;
}

@keyframes float-icon {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

.product-card:hover .product-icon {
    transform: scale(1.1) rotate(-5deg) translateY(-4px);
    background: var(--gradient-hover);
    animation: none;
    box-shadow: var(--shadow-md);
}

.product-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
    transition: color var(--transition-base);
}

.product-card:hover h3 {
    color: var(--primary);
}

.product-desc {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.product-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.product-features li {
    font-size: 0.875rem;
    color: var(--gray-600);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    transition: color var(--transition-fast);
}

.product-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.product-card:hover .product-features li {
    color: var(--gray-700);
}

.product-card:hover .product-features li::before {
    width: 8px;
    height: 8px;
}

/* 精致链接 */
.product-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    padding: 0.5rem 0;
}

.product-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-base);
}

.product-link:hover {
    gap: 0.75rem;
    color: var(--primary-dark);
    transform: translateX(2px);
}

.product-link:hover::before {
    width: calc(100% - 1.5rem);
}

.product-link::after {
    content: '→';
    transition: transform var(--transition-spring);
}

.product-link:hover::after {
    transform: translateX(4px) scale(1.2);
}

/* ==================== 联系我们 ==================== */
.contact {
    padding: 6rem 0;
    background: white;
    text-align: center;
}

.contact-content p {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 3rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    max-width: 800px;
    margin: 0 auto;
}

.contact-item {
    flex: 1;
    min-width: 280px;
    padding: 2rem;
    background: var(--gray-75);
    border: 0.5px solid var(--gray-200);
    border-radius: var(--radius-xl);
    transition: all var(--transition-smooth);
    cursor: pointer;
    box-shadow: var(--shadow-xs);
}

.contact-item:hover {
    background: var(--white);
    border-color: var(--primary);
    transform: translateY(-6px) scale(1.02);
    box-shadow: var(--shadow-primary);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
    transition: transform var(--transition-spring);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-6px);
    }
}

.contact-item:hover .contact-icon {
    transform: scale(1.15) rotate(5deg);
    animation: none;
}

.contact-item span:last-child {
    font-size: 0.9375rem;
    color: var(--gray-600);
    transition: color var(--transition-fast);
}

.contact-item:hover span:last-child {
    color: var(--gray-700);
}

/* ==================== 页脚 ==================== */
.footer {
    padding: 3rem 2rem;
    background: var(--gray-900);
    color: var(--gray-400);
    text-align: center;
    border-top: 1px solid var(--gray-800);
}

.footer p {
    margin: 0.5rem 0;
    font-size: 0.875rem;
}

.footer a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: white;
}

/* ==================== 滚动动画 ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    filter: blur(10px);
    transition: all 1s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
}

.section-title.fade-in {
    transform: translateY(30px) scale(0.95);
    filter: blur(8px);
}

.section-title.fade-in.visible {
    transform: translateY(0) scale(1);
    filter: blur(0);
}

.section-subtitle.fade-in {
    transform: translateY(25px);
    filter: blur(6px);
}

.section-subtitle.fade-in.visible {
    transform: translateY(0);
    filter: blur(0);
}

/* 卡片渐显动画 */
.business-card.fade-in,
.product-card.fade-in {
    opacity: 0;
    transform: translateY(50px) scale(0.9);
    filter: blur(12px);
    transition: all 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.business-card.fade-in.visible,
.product-card.fade-in.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .business-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .navbar .container {
        height: 64px;
    }
    
    .nav-menu {
        gap: 1.5rem;
    }
    
    .nav-menu a {
        font-size: 0.875rem;
    }
    
    .hero {
        min-height: 80vh;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .business-card,
    .product-card {
        padding: 2rem;
    }
    
    .contact-info {
        flex-direction: column;
    }
    
    .contact-item {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .cta-button {
        padding: 0.875rem 1.5rem;
        font-size: 0.9375rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .business-card,
    .product-card {
        padding: 1.5rem;
    }
}

/* ==================== 触摸设备优化 ==================== */
@media (hover: none) {
    .business-card:hover,
    .product-card:hover,
    .contact-item:hover {
        transform: none;
    }
    
    .business-card:active,
    .product-card:active,
    .contact-item:active {
        transform: scale(0.98);
    }
}

/* ==================== 返回顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 56px;
    height: 56px;
    background: var(--white);
    color: var(--gray-900);
    border: 0.5px solid var(--gray-200);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    transition: all var(--transition-smooth);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.8);
}

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

.back-to-top:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-primary-lg);
}

.back-to-top:active {
    transform: translateY(-2px) scale(1);
}

.back-to-top:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 48px;
        height: 48px;
    }
}

/* ==================== 自定义光标 ==================== */
.custom-cursor {
    position: fixed;
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                opacity 0.2s ease,
                background 0.2s ease,
                border-color 0.2s ease;
    transform: translate(-50%, -50%);
    opacity: 0;
}

.custom-cursor.visible {
    opacity: 1;
}

.custom-cursor-dot {
    position: fixed;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    pointer-events: none;
    z-index: 10000;
    transition: transform 0.1s ease,
                opacity 0.2s ease;
    transform: translate(-50%, -50%);
    opacity: 0;
}

.custom-cursor-dot.visible {
    opacity: 1;
}

/* 悬停在可交互元素上时 */
.custom-cursor.hover {
    transform: translate(-50%, -50%) scale(1.5);
    background: rgba(0, 113, 227, 0.1);
    border-color: var(--primary);
}

/* 点击时 */
.custom-cursor.click {
    transform: translate(-50%, -50%) scale(0.8);
}

/* 桌面端才显示自定义光标 */
@media (hover: hover) and (pointer: fine) {
    body.custom-cursor-enabled {
        cursor: none;
    }
    
    body.custom-cursor-enabled a,
    body.custom-cursor-enabled button,
    body.custom-cursor-enabled .business-card,
    body.custom-cursor-enabled .product-card,
    body.custom-cursor-enabled .contact-item {
        cursor: none;
    }
}

/* ==================== 无障碍优化 ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus可见性增强 - 全局 */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
    border-radius: 4px;
}

/* 键盘导航模式 */
body.keyboard-navigation *:focus {
    outline: 2px solid var(--primary) !important;
    outline-offset: 4px !important;
}

/* 增强按钮和链接的焦点样式 */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* CTA按钮特殊焦点效果 */
.cta-button:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 4px;
    box-shadow: 0 0 0 6px rgba(59, 130, 246, 0.15);
}

/* 卡片焦点效果 */
.business-card:focus-visible,
.product-card:focus-visible,
.contact-item:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
    transform: translateY(-4px);
}

/* ==================== 性能优化 ==================== */
@supports (backdrop-filter: blur(20px)) {
    .navbar {
        backdrop-filter: blur(20px) saturate(180%);
    }
}