/* ============================================
   杭州商点通科技有限公司 - 企业官网样式
   主题：科技蓝 + 霓虹青 + 深空黑
   风格：未来科技感、数据流、发光边框
   ============================================ */

/* CSS变量定义 - 科技感配色 */
:root {
    --primary: #0066ff;
    --primary-light: #3385ff;
    --primary-dark: #0052cc;
    --primary-gradient: linear-gradient(135deg, #0066ff 0%, #00c6ff 100%);
    --accent: #00f0ff;
    --accent-secondary: #00c6ff;
    --neon-blue: #00f0ff;
    --neon-purple: #a855f7;
    --neon-cyan: #22d3ee;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #64748b;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #020617;
    --bg-card: rgba(255, 255, 255, 0.95);
    --border: rgba(0, 102, 255, 0.15);
    --border-glow: rgba(0, 240, 255, 0.5);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0, 102, 255, 0.15);
    --shadow-lg: 0 8px 40px rgba(0, 102, 255, 0.2);
    --shadow-xl: 0 20px 60px rgba(0, 102, 255, 0.25);
    --shadow-neon: 0 0 30px rgba(0, 240, 255, 0.3);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1200px;
    --header-height: 72px;
}

/* 重置与基础 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

/* 容器 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   导航栏 - 科技感玻璃效果
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(0, 102, 255, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 30px rgba(0, 102, 255, 0.1);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 800;
    box-shadow: 0 0 20px rgba(0, 102, 255, 0.4);
    position: relative;
    overflow: hidden;
}

.logo-icon::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(45deg, var(--neon-blue), var(--primary), var(--neon-cyan));
    z-index: -1;
    filter: blur(8px);
    opacity: 0.6;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    margin: 0 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    transition: var(--transition);
}

/* 悬停状态 */
.nav-link:hover {
    color: var(--primary);
}

/* 选中状态 - 简洁下划线 */
.nav-link.active {
    color: var(--primary);
}

/* 选中下划线 - 固定宽度居中 */
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 2px;
    box-shadow: 0 0 8px rgba(0, 198, 255, 0.6);
}

/* 图标默认状态 */
.nav-icon {
    font-size: 0.75rem;
    color: var(--text-light);
    transition: var(--transition);
}

/* 图标悬停 */
.nav-link:hover .nav-icon {
    color: var(--primary);
}

/* 图标选中 - 放大 */
.nav-link.active .nav-icon {
    color: var(--neon-cyan);
    transform: scale(1.3);
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

.nav-link-cta::after {
    display: none;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ============================================
   首屏Banner - 深空科技背景
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(0, 102, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 240, 255, 0.1) 0%, transparent 40%),
        radial-gradient(ellipse at 60% 80%, rgba(168, 85, 247, 0.08) 0%, transparent 40%),
        linear-gradient(180deg, #020617 0%, #0f172a 50%, #1e293b 100%);
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: perspective(500px) rotateX(60deg) translateY(0); }
    100% { transform: perspective(500px) rotateX(60deg) translateY(60px); }
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
}

.hero-particles::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 30% 50%, rgba(0, 240, 255, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 70% 80%, rgba(0, 102, 255, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 50% 30%, rgba(168, 85, 247, 0.06) 0%, transparent 35%);
    animation: particleFloat 15s ease-in-out infinite;
}

@keyframes particleFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, 2%) rotate(1deg); }
    66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

/* 数据流光效 */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon-blue), transparent);
    animation: dataStream 3s linear infinite;
    opacity: 0.5;
}

@keyframes dataStream {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    padding: 60px 24px;
}

.hero-title {
    font-size: clamp(2.2rem, 5.5vw, 4rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #a5f3fc 30%, #67e8f9 60%, #c4b5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(0, 240, 255, 0.3);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.35rem);
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 40px;
    font-weight: 400;
    letter-spacing: 0.05em;
}

.hero-subtitle::before {
    content: '// ';
    color: var(--neon-blue);
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 36px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--neon-cyan) 0%, var(--primary) 100%);
    color: white;
    box-shadow: 0 4px 25px rgba(0, 198, 255, 0.4), 0 0 0 1px rgba(0, 240, 255, 0.3);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.2), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 35px rgba(0, 198, 255, 0.5), 0 0 20px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover::before {
    transform: translateX(100%);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: white;
    border: 1px solid rgba(0, 240, 255, 0.3);
    backdrop-filter: blur(10px);
    box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.05);
}

.btn-secondary:hover {
    background: rgba(0, 240, 255, 0.1);
    border-color: rgba(0, 240, 255, 0.5);
    transform: translateY(-3px);
    box-shadow: inset 0 0 30px rgba(0, 240, 255, 0.1), 0 0 20px rgba(0, 240, 255, 0.2);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    flex-wrap: wrap;
    position: relative;
}

.hero-stats::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 10%;
    right: 10%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.3), transparent);
}

.stat-item {
    text-align: center;
    position: relative;
    padding: 20px 30px;
    background: rgba(0, 102, 255, 0.05);
    border: 1px solid rgba(0, 240, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.stat-item::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.3), transparent, rgba(0, 102, 255, 0.3));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.stat-number {
    font-size: 2.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    text-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    margin-top: 8px;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.05em;
}

/* ============================================
   通用区块样式
   ============================================ */
section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 240, 255, 0.1));
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
    border: 1px solid rgba(0, 102, 255, 0.2);
    position: relative;
}

.section-tag::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 100px;
    padding: 1px;
    background: linear-gradient(135deg, var(--neon-cyan), var(--primary));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0.5;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ============================================
   核心业务板块 - 科技卡片
   ============================================ */
.services {
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 102, 255, 0.2), transparent);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.03), transparent, rgba(0, 240, 255, 0.03));
    opacity: 0;
    transition: opacity 0.3s;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0, 240, 255, 0.2);
    border-color: rgba(0, 240, 255, 0.3);
}

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

.service-card-featured {
    border: 1px solid transparent;
    background: linear-gradient(white, white) padding-box,
                linear-gradient(135deg, var(--neon-cyan), var(--primary), var(--neon-blue)) border-box;
    box-shadow: var(--shadow-xl), 0 0 30px rgba(0, 198, 255, 0.15);
}

.service-card-featured::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, rgba(0, 240, 255, 0.1), transparent 30%);
    animation: rotateBorder 4s linear infinite;
}

@keyframes rotateBorder {
    100% { transform: rotate(360deg); }
}

.featured-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, var(--neon-cyan), var(--primary));
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 100px;
    z-index: 2;
    box-shadow: 0 4px 15px rgba(0, 198, 255, 0.4);
}

.service-icon {
    width: 64px;
    height: 64px;
    color: var(--primary);
    margin-bottom: 24px;
    position: relative;
    z-index: 2;
}

.service-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 10px rgba(0, 102, 255, 0.3));
}

.service-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    position: relative;
    z-index: 2;
}

.service-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    position: relative;
    z-index: 2;
}

.service-highlight {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.875rem;
    color: var(--text-light);
    position: relative;
    z-index: 2;
}

.highlight-tag {
    display: inline-block;
    padding: 5px 12px;
    background: rgba(0, 102, 255, 0.08);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    white-space: nowrap;
}

.highlight-tag-ai {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(0, 102, 255, 0.15));
    color: var(--primary);
    border: 1px solid rgba(0, 240, 255, 0.3);
}

/* ============================================
   成功案例展示区 - 科技卡片
   ============================================ */
.cases {
    background: var(--bg-white);
    position: relative;
}

.cases::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 102, 255, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0, 240, 255, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.case-card {
    display: block;
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
}

.case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--neon-cyan));
    transform: scaleX(0);
    transition: transform 0.3s;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(0, 102, 255, 0.1);
    border-color: rgba(0, 240, 255, 0.3);
}

.case-card:hover::before {
    transform: scaleX(1);
}

.case-card-ai {
    border: 1px solid transparent;
    background: linear-gradient(white, white) padding-box,
                linear-gradient(135deg, var(--neon-cyan), var(--primary), var(--neon-blue)) border-box;
}

.case-card-ai::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-blue), var(--neon-cyan));
    background-size: 200% 100%;
    animation: shimmer 2s linear infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.case-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.case-category {
    display: inline-block;
    padding: 5px 12px;
    background: rgba(0, 102, 255, 0.08);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
}

.ai-badge {
    display: inline-block;
    padding: 5px 12px;
    background: linear-gradient(135deg, var(--neon-cyan), var(--primary));
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0, 198, 255, 0.3);
}

.case-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.case-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.case-results {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.result-item-full {
    flex: 1 1 100%;
}

.result-value {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.result-unit {
    font-size: 1rem;
    font-weight: 600;
}

.result-label {
    font-size: 0.8125rem;
    color: var(--text-light);
}

/* ============================================
   AI技术实力专区 - 科技网格
   ============================================ */
.ai-tech {
    background: linear-gradient(180deg, #f1f5f9 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

.ai-tech::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 102, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
}

.ai-tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 60px;
    position: relative;
    z-index: 2;
}

.ai-tech-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.ai-tech-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.05), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.ai-tech-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0, 240, 255, 0.2);
    border-color: rgba(0, 240, 255, 0.3);
}

.ai-tech-card:hover::before {
    opacity: 1;
}

.ai-tech-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    color: var(--primary);
    position: relative;
}

.ai-tech-icon::before {
    content: '';
    position: absolute;
    inset: -10px;
    background: radial-gradient(circle, rgba(0, 198, 255, 0.2), transparent 70%);
    z-index: -1;
}

.ai-tech-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 8px rgba(0, 102, 255, 0.3));
}

.ai-tech-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    position: relative;
}

.ai-tech-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    position: relative;
}

.ai-service-chain {
    background: white;
    border-radius: var(--radius-xl);
    padding: 40px;
    text-align: center;
    border: 1px solid var(--border);
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-lg);
}

.ai-service-chain::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.3), transparent, rgba(0, 102, 255, 0.3));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.ai-service-chain h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 32px;
    position: relative;
}

.service-chain {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.chain-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.chain-dot {
    width: 16px;
    height: 16px;
    background: var(--primary-gradient);
    border-radius: 50%;
    box-shadow: 0 0 0 6px rgba(0, 102, 255, 0.1), 0 0 20px rgba(0, 198, 255, 0.4);
    position: relative;
}

.chain-dot::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid rgba(0, 240, 255, 0.3);
    animation: pulse 2s ease-out infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

.chain-item span {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.chain-arrow {
    width: 50px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--neon-cyan));
    position: relative;
    flex-shrink: 0;
}

.chain-arrow::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    border: 5px solid transparent;
    border-left: 6px solid var(--neon-cyan);
}

/* ============================================
   关于我们
   ============================================ */
.about-company {
    background: linear-gradient(180deg, var(--bg-white) 0%, #f8fafc 100%);
    padding: 100px 0;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.about-text {
    margin-bottom: 48px;
}

.about-text p {
    font-size: 1.0625rem;
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.about-lead {
    font-size: 1.25rem !important;
    font-weight: 500;
    color: var(--text-primary) !important;
    margin-bottom: 24px;
}

.about-vision {
    font-size: 1.125rem !important;
    color: var(--primary) !important;
    margin-top: 28px;
    padding: 20px 24px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.05), rgba(0, 240, 255, 0.05));
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.about-highlight-item {
    text-align: center;
    padding: 24px;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.about-highlight-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0, 102, 255, 0.2);
}

.highlight-year {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.highlight-text {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-weight: 500;
}

@media (max-width: 768px) {
    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .highlight-year {
        font-size: 2rem;
    }
}

/* 联系我们 */
.about-contact {
    margin-top: 48px;
    padding-top: 48px;
    border-top: 1px solid var(--border);
}

.about-contact h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    text-align: center;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 20px;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.contact-item:hover {
    border-color: rgba(0, 102, 255, 0.2);
    box-shadow: var(--shadow-md);
}

.contact-item svg {
    width: 20px;
    height: 20px;
    color: var(--primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-item > div {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 0.8125rem;
    color: var(--text-light);
    font-weight: 500;
}

.contact-value {
    font-size: 0.9375rem;
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   公司优势 - 科技卡片
   ============================================ */
.advantages {
    background: var(--bg-white);
    position: relative;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--neon-cyan), var(--primary));
    transform: scaleY(0);
    transition: transform 0.3s;
}

.advantage-card:hover {
    background: white;
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
    border-color: rgba(0, 240, 255, 0.2);
}

.advantage-card:hover::before {
    transform: scaleY(1);
}

.advantage-number {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 240, 255, 0.1));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 16px;
    transition: var(--transition);
}

.advantage-card:hover .advantage-number {
    background: linear-gradient(135deg, var(--primary), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.advantage-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.advantage-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   底部 - 深空科技风
   ============================================ */
.footer {
    background: 
        radial-gradient(ellipse at 30% 0%, rgba(0, 102, 255, 0.1) 0%, transparent 50%),
        linear-gradient(180deg, #0f172a 0%, #020617 100%);
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 0;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
    opacity: 0.5;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
    position: relative;
    z-index: 2;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 0.9375rem;
    line-height: 1.7;
    max-width: 320px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-contact h4,
.footer-links h4 {
    font-size: 1rem;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
}

.contact-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.7);
}

.contact-list svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    color: var(--neon-cyan);
    margin-top: 2px;
}

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links ul li a {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links ul li a:hover {
    color: var(--neon-cyan);
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px 0;
    text-align: center;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.4);
    position: relative;
    z-index: 2;
}

/* ============================================
   动画
   ============================================ */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-animate].animated {
    opacity: 1;
    transform: translateY(0);
}

[data-delay="100"] { transition-delay: 0.1s; }
[data-delay="200"] { transition-delay: 0.2s; }
[data-delay="300"] { transition-delay: 0.3s; }
[data-delay="400"] { transition-delay: 0.4s; }
[data-delay="500"] { transition-delay: 0.5s; }
[data-delay="600"] { transition-delay: 0.6s; }

/* ============================================
   响应式布局
   ============================================ */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .service-card-featured {
        grid-column: 1 / -1;
    }

    .ai-tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .hero-stats {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(0, 240, 255, 0.1);
        padding: 16px 24px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-list {
        flex-direction: column;
        gap: 4px;
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
        color: rgba(255, 255, 255, 0.8);
    }

    .nav-link:hover,
    .nav-link.active {
        color: var(--neon-cyan);
        background: rgba(0, 240, 255, 0.1);
    }

    .nav-link.active::after {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn span {
        background: white;
    }

    .mobile-menu-btn.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.open span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-item {
        padding: 16px 24px;
    }

    .stat-number {
        font-size: 2rem;
    }

    section {
        padding: 60px 0;
    }

    .services-grid,
    .cases-grid,
    .ai-tech-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .service-card-featured {
        grid-column: auto;
    }

    .case-results {
        flex-direction: column;
        gap: 12px;
    }

    .service-chain {
        flex-direction: column;
        gap: 20px;
    }

    .chain-arrow {
        width: 2px;
        height: 24px;
        transform: rotate(90deg);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .hero::before {
        background-size: 40px 40px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .service-card,
    .case-card,
    .ai-tech-card,
    .advantage-card {
        padding: 24px 20px;
    }

    .ai-service-chain {
        padding: 24px 20px;
    }

    .hero-title {
        font-size: 1.75rem;
    }
}