/* ============================================
   杰亚策划 - 企业官网样式表
   设计风格：专业、现代、科技感
   配色：白、深灰、黑色 + 紫色点缀
   ============================================ */

/* CSS 变量定义 */
:root {
    /* 主色调 */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-accent: #a855f7;
    --color-accent-light: #c084fc;
    
    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-300: #d4d4d4;
    --color-gray-400: #a3a3a3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;
    --color-black: #0a0a0a;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-dark: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-black) 100%);
    --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    
    /* 字体 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    --shadow-glow-sm: 0 0 20px rgba(99, 102, 241, 0.2);
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* 容器宽度 */
    --container-max: 1280px;
    --container-padding: 1.5rem;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, svg {
    display: block;
    max-width: 100%;
}

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* 容器 */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn svg {
    width: 1.125rem;
    height: 1.125rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-sm);
}

.btn-secondary {
    background: var(--color-gray-900);
    color: var(--color-white);
}

.btn-secondary:hover {
    background: var(--color-black);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-gray-800);
    border: 1.5px solid var(--color-gray-300);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.btn-light:hover {
    background: var(--color-gray-50);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* ============================================
   导航栏
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo-text {
    display: block;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--color-gray-900);
}

.logo-subtitle {
    display: block;
    font-size: 0.875rem;
    color: var(--color-gray-500);
    font-weight: 400;
    line-height: 1.3;
}

.nav-phone {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
    color: var(--color-gray-600);
    text-decoration: none;
    margin-right: 1.5rem;
    transition: color var(--transition-fast);
}

.nav-phone:hover {
    color: var(--color-primary);
}

@media (max-width: 768px) {
    .nav-phone {
        display: none;
    }
}

.logo-icon {
    width: 72px;
    height: 72px;
    display: block;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    flex: 1;
    justify-content: center;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-gray-600);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--color-gray-900);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-cta {
    margin-left: 1rem;
}

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

@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1.5rem;
    }
    
    .nav-right {
        display: none;
    }
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-800);
    transition: all var(--transition-base);
}

/* ============================================
   首屏 Hero 区域
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-carousel {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.6s ease-in-out;
}

.hero-slide.active {
    position: relative;
    opacity: 1;
    visibility: visible;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-glow {
    position: absolute;
    top: 50%;
    right: 10%;
    width: 600px;
    height: 600px;
    background: var(--gradient-glow);
    transform: translateY(-50%);
    border-radius: 50%;
    filter: blur(60px);
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: calc(100vh - 80px);
    padding: 60px 0;
}

.hero-text {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.15;
    color: var(--color-gray-900);
    margin-bottom: 1.5rem;
}

.title-line {
    display: block;
}

.title-line.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* Hero 视觉区域 */
.hero-visual {
    display: none;
}

/* 首屏轮播控制 */
.hero-carousel-controls {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    z-index: 10;
}

.hero-carousel-controls .carousel-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: 50%;
    color: var(--color-gray-600);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.hero-carousel-controls .carousel-btn:hover {
    background: var(--color-gray-50);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: scale(1.1);
}

.hero-carousel-controls .carousel-dots {
    display: flex;
    gap: 0.75rem;
}

.hero-carousel-controls .dot {
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.5);
    border: 2px solid var(--color-white);
    border-radius: 50%;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.hero-carousel-controls .dot.active {
    background: var(--color-white);
    width: 32px;
    border-radius: 6px;
    box-shadow: var(--shadow-md);
}

/* 品牌图标网格 */
.brand-icon-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.brand-icon-item {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    color: var(--color-primary);
    transition: transform var(--transition-base);
}

.brand-icon-item:hover {
    transform: translateY(-5px);
}

.brand-icon-item svg {
    width: 36px;
    height: 36px;
}

.brand-icon-item:nth-child(2) {
    transform: translateY(-20px);
}

.brand-icon-item:nth-child(2):hover {
    transform: translateY(-25px);
}

/* 营销环 */
.marketing-rings {
    position: relative;
    width: 250px;
    height: 250px;
}

.m-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 2px solid;
}

.ring-1 {
    width: 250px;
    height: 250px;
    border-color: rgba(99, 102, 241, 0.2);
    animation: pulse 3s ease-in-out infinite;
}

.ring-2 {
    width: 180px;
    height: 180px;
    border-color: rgba(168, 85, 247, 0.3);
    animation: pulse 3s ease-in-out infinite 0.5s;
}

.ring-3 {
    width: 110px;
    height: 110px;
    border-color: rgba(99, 102, 241, 0.4);
    animation: pulse 3s ease-in-out infinite 1s;
}

.m-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    color: var(--color-white);
    box-shadow: var(--shadow-glow-sm);
}

.m-center svg {
    width: 28px;
    height: 28px;
}

/* AI 网络 */
.ai-network {
    position: relative;
    width: 300px;
    height: 200px;
}

.network-node {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: var(--shadow-glow-sm);
    animation: nodePulse 2s ease-in-out infinite;
}

.network-node.node-1 { top: 50%; left: 15%; animation-delay: 0s; }
.network-node.node-2 { top: 30%; left: 40%; animation-delay: 0.3s; }
.network-node.node-3 { top: 40%; left: 65%; animation-delay: 0.6s; }
.network-node.node-4 { top: 65%; left: 80%; animation-delay: 0.9s; }
.network-node.node-5 { top: 75%; left: 35%; animation-delay: 1.2s; }

.network-connections {
    position: absolute;
    inset: 0;
}

@keyframes pulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.05);
        opacity: 0.7;
    }
}

@keyframes nodePulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.3);
        opacity: 0.7;
    }
}

.hero-abstract {
    position: relative;
    width: 100%;
    height: 100%;
}

.abstract-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.circle-1 {
    width: 400px;
    height: 400px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-color: rgba(99, 102, 241, 0.15);
}

.circle-2 {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-color: rgba(168, 85, 247, 0.2);
}

.circle-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--gradient-primary);
    opacity: 0.08;
    border: none;
}

.abstract-lines {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
}

.abstract-svg {
    width: 100%;
    height: 100%;
}

.abstract-line {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawLine 3s ease forwards;
}

@keyframes drawLine {
    to {
        stroke-dashoffset: 0;
    }
}

.floating-elements {
    position: absolute;
    inset: 0;
}

.float-element {
    position: absolute;
    width: 48px;
    height: 48px;
    padding: 12px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    color: var(--color-primary);
    animation: float 6s ease-in-out infinite;
}

.float-element svg {
    width: 100%;
    height: 100%;
}

.el-1 {
    top: 15%;
    left: 10%;
    animation-delay: 0s;
}

.el-2 {
    top: 60%;
    right: 5%;
    animation-delay: -2s;
}

.el-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: -4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-gray-500);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

.scroll-mouse {
    width: 24px;
    height: 36px;
    border: 2px solid var(--color-gray-400);
    border-radius: 12px;
    position: relative;
}

.scroll-wheel {
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 6px;
    background: var(--color-gray-400);
    border-radius: 2px;
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

/* ============================================
   轮播区
   ============================================ */


/* ============================================
   通用区块样式
   ============================================ */
.section {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 4rem;
}

.section-header.light {
    color: var(--color-white);
}

.section-header.light .section-title {
    color: var(--color-white);
}

.section-header.light .section-desc {
    color: rgba(255, 255, 255, 0.7);
}

.section-tag {
    display: inline-block;
    padding: 0.375rem 1rem;
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}

.section-tag.highlight {
    background: rgba(99, 102, 241, 0.15);
    color: var(--color-primary-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* ============================================
   品牌与营销板块
   ============================================ */
.branding-section {
    background: var(--color-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.service-card {
    padding: 2rem;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.service-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.08);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    margin-bottom: 1.5rem;
}

.service-icon svg {
    width: 28px;
    height: 28px;
}

.service-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.5rem;
}

.service-subtitle {
    font-size: 0.9375rem;
    color: var(--color-gray-500);
    margin-bottom: 1.25rem;
    line-height: 1.5;
}

.service-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.service-list li {
    padding: 0.375rem 0.875rem;
    background: var(--color-gray-50);
    color: var(--color-gray-600);
    font-size: 0.875rem;
    border-radius: var(--radius-full);
}

/* ============================================
   AI 升级板块
   ============================================ */
.ai-section {
    position: relative;
    background: #16181d;
    overflow: hidden;
    padding-top: 200px;
    margin-top: -100px;
}

.ai-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(
        180deg,
        #ffffff 0%,
        #f5f6f8 20%,
        #16181d 100%
    );
    z-index: 1;
}

.ai-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.ai-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.04) 1px, transparent 1px);
    background-size: 120px 120px;
    opacity: 0.4;
}

.ai-section .container {
    position: relative;
    z-index: 2;
}

.ai-services {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.ai-card {
    padding: 2.5rem;
    background: #1f232b;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.ai-card:hover {
    background: #232833;
    border-color: rgba(99, 102, 241, 0.2);
    transform: translateY(-6px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
}

.ai-card.featured {
    background: rgba(99, 102, 241, 0.08);
    border-color: rgba(99, 102, 241, 0.2);
}

.ai-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.ai-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-lg);
    color: var(--color-primary-light);
}

.ai-icon svg {
    width: 28px;
    height: 28px;
}

.ai-number {
    font-size: 0.875rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.5);
}

.ai-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.75rem;
}

.ai-desc {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.ai-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.ai-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9375rem;
}

.ai-list li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-primary-light);
    border-radius: 50%;
}

.ai-summary {
    text-align: center;
    padding: 3rem;
    background: #1f232b;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.summary-text {
    font-size: 1.5rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
}

/* ============================================
   案例板块
   ============================================ */
.cases-section {
    background: var(--color-white);
    padding: 100px 0;
}

.cases-section .container {
    max-width: 1200px;
}

.cases-section .section-header {
    margin-bottom: 3rem;
}

.cases-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    padding: 0.5rem;
    background: var(--color-gray-50);
    border-radius: var(--radius-full);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.tab-btn {
    padding: 0.875rem 2.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-gray-600);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03);
    cursor: pointer;
}

.tab-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    font-weight: 600;
    transform: translateY(-1px);
}

.cases-content {
    position: relative;
}

.cases-grid {
    display: none;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.cases-grid.active {
    display: grid;
}

.case-card {
    background: var(--color-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.02);
    border: 1px solid var(--color-gray-100);
    transition: all var(--transition-base);
    position: relative;
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
    border-color: rgba(99, 102, 241, 0.2);
}

.case-info {
    padding: 1.5rem;
}

.case-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(99, 102, 241, 0.08);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 0.75rem;
    letter-spacing: 0.025em;
}

.case-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 0.75rem;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 1rem;
}

.case-tags span {
    padding: 0.2rem 0.625rem;
    background: var(--color-gray-50);
    color: var(--color-gray-600);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    letter-spacing: 0.025em;
}

.case-desc {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.case-desc p {
    margin: 0;
}

.case-result {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    line-height: 1.5;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-gray-100);
    font-weight: 500;
}

/* 移动端适配 */
@media (max-width: 1024px) {
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }
    
    .cases-section {
        padding: 80px 0;
    }
}

@media (max-width: 768px) {
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    
    .cases-tabs {
        flex-direction: column;
        gap: 0.5rem;
        padding: 1rem;
        border-radius: var(--radius-lg);
    }
    
    .tab-btn {
        padding: 0.75rem 1.5rem;
        text-align: center;
    }
    
    .case-info {
        padding: 1.25rem;
    }
    
    .case-name {
        font-size: 1.125rem;
    }
    
    .cases-section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .case-info {
        padding: 1.125rem;
    }
    
    .case-name {
        font-size: 1.0625rem;
    }
    
    .case-desc {
        font-size: 0.8125rem;
    }
}

/* ============================================
   联系/留资模块
   ============================================ */
.contact-section {
    position: relative;
    padding: 100px 0;
    background: linear-gradient(135deg, #f8faff 0%, #ffffff 100%);
    overflow: hidden;
}

.contact-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.contact-glow {
    position: absolute;
    top: 50%;
    left: 0;
    width: 600px;
    height: 600px;
    background: var(--gradient-glow);
    transform: translate(-50%, -50%);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.contact-section .container {
    position: relative;
    z-index: 1;
    max-width: 1100px;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 3rem;
    align-items: center;
}

.contact-info {
    text-align: center;
}

.contact-tag {
    display: inline-block;
    padding: 0.375rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}

.contact-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

.contact-desc {
    font-size: 1.0625rem;
    color: var(--color-gray-600);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.contact-features {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9375rem;
    color: var(--color-gray-700);
    justify-content: center;
}

.feature-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border-radius: 50%;
    flex-shrink: 0;
}

.feature-icon svg {
    width: 12px;
    height: 12px;
}

.contact-requirement {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    font-weight: 500;
    margin-top: 1.5rem;
}

/* 表单样式 */
.contact-form-wrapper {
    background: var(--color-white);
    padding: 2.25rem;
    border-radius: var(--radius-2xl);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--color-gray-100);
    position: relative;
    overflow: hidden;
}

.contact-form-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.contact-form-header {
    margin-bottom: 1.75rem;
}

.contact-form-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: 0.5rem;
}

.contact-form-subtitle {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.875rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-700);
}

.form-group input,
.form-group textarea {
    padding: 1rem 1.125rem;
    font-size: 0.9375rem;
    color: var(--color-gray-800);
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-400);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-full {
    width: 100%;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.0625rem;
    font-weight: 600;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-lg);
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(99, 102, 241, 0.3);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-400);
}

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

/* ============================================
   关于我们
   ============================================ */
.about-section {
    background: var(--color-white);
    padding-bottom: 80px;
}

.about-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

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

.about-text .section-tag {
    margin-bottom: 1rem;
    display: inline-block;
}

.about-text .section-title {
    margin-bottom: 1.5rem;
}

.about-desc {
    font-size: 1.0625rem;
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.about-stats {
    display: flex;
    gap: 3rem;
    justify-content: center;
    margin-top: 2rem;
    padding: 1.5rem 0;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
    text-align: center;
    padding: 1.5rem 2rem;
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--color-gray-500);
}

.about-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-abstract {
    position: relative;
    width: 350px;
    height: 350px;
}

.about-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 280px;
    height: 280px;
    border: 2px solid var(--color-gray-200);
    border-radius: 50%;
}

.about-circle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border: 2px solid rgba(99, 102, 241, 0.2);
    border-radius: 50%;
}

.about-circle::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    background: var(--gradient-primary);
    opacity: 0.1;
    border-radius: 50%;
}

.about-dots {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    place-items: center;
    padding: 20px;
}

.about-dots span {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    opacity: 0.3;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: #1a1d22;
    color: rgba(255, 255, 255, 0.9);
    padding: 80px 0 40px;
    margin-top: 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 2fr 1fr;
    gap: 4rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1rem;
}

.footer-logo .logo-icon {
    /* 保持与顶部 LOGO 相同的样式 */
}

.footer-desc {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.25rem;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

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

.footer-column a:hover {
    color: rgba(255, 255, 255, 0.9);
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-info p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.4;
    margin: 0;
}

.footer-info a {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-info a:hover {
    color: rgba(255, 255, 255, 0.9);
}

.footer-qr {
    text-align: center;
}

.qr-placeholder {
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    margin: 0 auto 0.75rem;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-qr p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal {
    display: flex;
    gap: 2rem;
}

.footer-legal a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================
   弹窗
   ============================================ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--color-white);
    padding: 3rem;
    border-radius: var(--radius-2xl);
    text-align: center;
    max-width: 400px;
    width: 90%;
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
}

.modal-icon svg {
    width: 32px;
    height: 32px;
}

.modal-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.75rem;
}

.modal-content p {
    font-size: 1rem;
    color: var(--color-gray-600);
    margin-bottom: 1.5rem;
}

/* ============================================
   滚动动画
   ============================================ */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ai-services {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-main {
        grid-template-columns: 1fr 1.5fr;
    }
    
    .footer-qr {
        display: none;
    }
}

@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text {
        max-width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        height: 350px;
    }
    
    .slide-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .slide-visual {
        order: -1;
        height: 200px;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        text-align: center;
    }
    
    .contact-features {
        align-items: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-stats {
        justify-content: center;
    }
    

}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        border-bottom: 1px solid var(--color-gray-200);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-cta {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .section-title {
        font-size: 1.875rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .ai-services {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    /* 手机端首页简化 */
    .hero-text h1 {
        font-size: 2rem;
        text-align: center;
    }
    
    .hero-text .hero-subtitle {
        font-size: 1rem;
        text-align: center;
        margin-bottom: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    /* 隐藏复杂内容 */
    .branding-section .section-desc,
    .cases-section .section-desc,
    .about-section .about-desc {
        display: none;
    }
    
    /* 保留核心能力 */
    .ai-services .ai-card:nth-child(n+4) {
        display: none;
    }
    
    /* 解决方案入口按钮 */
    .solution-cta {
        display: block;
        text-align: center;
        margin: 2rem 0;
    }
    
    .solution-cta .btn {
        font-size: 1.125rem;
        padding: 1rem 2rem;
    }
    
    /* 手机端产品卡片 */
    .product-cards {
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        margin: 2rem 0;
    }
    
    .product-card {
        background: var(--color-white);
        padding: 1.5rem;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-md);
        border: 1px solid var(--color-gray-200);
        text-align: center;
    }
    
    .product-card h3 {
        font-size: 1.25rem;
        font-weight: 600;
        color: var(--color-gray-900);
        margin-bottom: 0.5rem;
    }
    
    .product-card p {
        font-size: 0.9375rem;
        color: var(--color-gray-600);
        margin-bottom: 1rem;
        line-height: 1.5;
    }
    
    .product-price {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--color-primary);
        margin-bottom: 1.5rem;
    }
    
    .product-card .btn {
        width: 100%;
        font-size: 1rem;
        padding: 0.875rem;
    }
    
    /* 手机端解决方案页 */
    .solution-hero {
        text-align: center;
        padding: 100px 0 60px;
    }
    
    .solution-hero h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    .solution-hero p {
        font-size: 1rem;
        color: var(--color-gray-600);
        margin-bottom: 2rem;
    }
    
    /* 手机端底部转化区 */
    .mobile-conversion {
        background: var(--color-white);
        padding: 2rem 1rem;
        text-align: center;
        border-top: 1px solid var(--color-gray-200);
    }
    
    .mobile-conversion h3 {
        font-size: 1.25rem;
        margin-bottom: 1rem;
    }
    
    .mobile-conversion .qr-code {
        width: 150px;
        height: 150px;
        margin: 0 auto 1rem;
    }
    
    .mobile-conversion p {
        font-size: 0.9375rem;
        color: var(--color-gray-600);
        margin-bottom: 1.5rem;
    }
    
    .mobile-conversion .btn {
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.875rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
    }
    
    .contact-form-wrapper {
        padding: 1.5rem;
    }
    
    .about-abstract {
        width: 280px;
        height: 280px;
    }
    
    .about-circle {
        width: 220px;
        height: 220px;
    }
}