/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 颜色系统 */
    --primary-blue: #2563eb;
    --light-blue: #3b82f6;
    --dark-blue: #1e40af;
    --hero-blue: #eff6ff;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* 过渡效果 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 边距系统 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 40px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
    /* 优化性能 */
    -webkit-tap-highlight-color: transparent;
    text-size-adjust: 100%;
}

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

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: box-shadow var(--transition-normal);
    will-change: box-shadow;
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 84px;
    padding: 0 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
    font-size: 20px;
    color: var(--text-dark);
    text-decoration: none;
}

.nav-logo-link {
    display: flex;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    color: inherit;
}

.logo-icon {
    width: 64px;
    height: 64px;
    object-fit: contain;
    object-position: center;
    display: flex;
    flex-shrink: 0;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

.logo-text {
    color: var(--text-dark);
    line-height: 1;
    font-size: 22px;
    font-weight: 600;
    display: flex;
    align-items: center;
    height: 60px;
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-link {
    color: var(--text-gray);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.3s ease;
    position: relative;
}

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

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

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

.nav-cta {
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
    text-decoration: none;
    display: inline-block;
    font-family: inherit;
}

.nav-cta:hover {
    background: var(--dark-blue);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* ===== 英雄区域 ===== */
.hero {
    margin-top: 84px;
    background: linear-gradient(135deg, var(--hero-blue) 0%, var(--white) 70%);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    background: rgba(37, 99, 235, 0.1);
    color: var(--text-dark);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 18px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    font-family: inherit;
    display: inline-block;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--hero-blue);
    transform: translateY(-2px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-image {
    position: relative;
    z-index: 1;
}

.hero-video {
    width: 100%;
    aspect-ratio: 16 / 9;
    height: auto;
    display: block;
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    object-fit: cover;
    transition: opacity 0.5s ease, transform 0.3s ease;
}

.hero-video:hover {
    transform: scale(1.02);
}

/* ===== 解决方案区域 ===== */
.solutions {
    padding: 100px 0;
    background: var(--white);
}

/* ===== 核心优势区域 ===== */
.advantages {
    padding: 100px 0;
    background: var(--gray-50);
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-dark);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.solutions-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.solution-card {
    background: var(--white);
    border-radius: 12px;
    padding: 32px;
    border: 1px solid #e5e7eb;
    box-shadow: none;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-icon {
    width: 56px;
    height: 56px;
    background: var(--hero-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--primary-blue);
}

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

.card-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    text-align: left;
}

.card-description {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.6;
    text-align: left;
}

/* ===== 关于我们区域 ===== */
.about-hero {
    margin-top: 84px;
    padding: 80px 0;
    background: var(--white);
    text-align: center;
}

.about-hero-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
    line-height: 1.2;
}

.about-hero-description {
    font-size: 18px;
    color: var(--text-dark);
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
}

.about {
    padding: 120px 0;
    background: var(--gray-50);
}

.about-gray {
    background: var(--gray-50);
}

.about-white {
    background: var(--white);
}

.about + .about {
    padding-top: 80px;
}

@media (max-width: 968px) {
    .about {
        padding: 80px 0;
    }
    
    .about + .about {
        padding-top: 60px;
    }
}

@media (max-width: 640px) {
    .about {
        padding: 60px 0;
    }
    
    .about + .about {
        padding-top: 40px;
    }
}

.about-content {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 60px;
    align-items: start;
}

.about-image {
    width: 100%;
    background: transparent;
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    height: auto;
}

.about-image:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15), 0 6px 16px rgba(0, 0, 0, 0.1);
}

.about-image-placeholder {
    color: var(--text-light);
    font-size: 16px;
}

.about-image-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    position: relative;
    z-index: 0;
}

.about-text {
    padding-left: 0;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding-top: 0;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.about-text .section-title {
    margin-bottom: 24px;
    font-size: 36px;
    line-height: 1.3;
    color: #101C36;
    font-weight: 700;
    margin-top: 0;
}

@media (min-width: 969px) {
    .about-content {
        gap: 70px;
    }
    
    .about-text {
        padding-left: 0;
        padding-top: 0;
    }
    
    .about-text .section-title {
        font-size: 36px;
        line-height: 1.2;
    }
    
    .about-description {
        font-size: 16px;
        line-height: 1.8;
    }
}

.about-description {
    font-size: 16px;
    color: #4A4A4A;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-description:first-of-type {
    font-size: 16px;
    font-weight: 400;
    color: #4A4A4A;
    margin-bottom: 20px;
}

.about-description:last-of-type {
    margin-bottom: 0;
}

.about-advantages-section {
    margin-top: 0;
}

.section-title-center {
    text-align: center;
    margin-bottom: 48px;
}

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

.advantage-item {
    background: var(--white);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--gray-200);
    border-left: 1px solid rgba(37, 99, 235, 0.3);
    transition: all 0.3s ease;
    position: relative;
}

.advantage-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--primary-blue);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.advantage-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    transition: color 0.3s ease;
}

.advantage-item:hover .advantage-title {
    color: var(--primary-blue);
}

.advantage-description {
    font-size: 15px;
    color: var(--text-dark);
    line-height: 1.6;
}

.about-stats {
    display: flex;
    gap: 48px;
}

/* ===== 统计数据部分（深蓝色背景） ===== */
.about-stats-section {
    padding: 80px 0;
    background: var(--primary-blue);
}

.about-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item-large {
    color: var(--white);
}

.stat-number-large {
    font-size: 56px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
    line-height: 1;
}

.stat-label-large {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.5;
}

/* ===== 价值观部分 ===== */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.value-card {
    background: var(--white);
    padding: 40px 32px;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

.value-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.value-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--primary-blue), #2563eb);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.value-icon svg {
    width: 40px;
    height: 40px;
}

.value-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.value-description {
    font-size: 15px;
    color: var(--text-dark);
    line-height: 1.8;
}

.values-header {
    text-align: center;
    margin-bottom: 60px;
}

.values-header .section-subtitle {
    margin-top: 16px;
}

/* ===== 导航链接激活状态 ===== */
.nav-link.active {
    color: var(--primary-blue);
    font-weight: 600;
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 8px;
    line-height: 1;
}

.stat-label {
    font-size: 16px;
    color: var(--text-gray);
}

/* ===== 英雄区域特性标签（AI产品通用） ===== */
.hero-features {
    margin-top: 24px;
    display: flex;
    gap: 32px;
    color: var(--text-gray);
    font-size: 14px;
    align-items: center;
    flex-wrap: wrap;
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-feature-icon {
    color: var(--primary-blue);
    flex-shrink: 0;
}

.hero-main-image {
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: contain;
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
}

/* ===== 统计数据网格（AI产品通用） ===== */
.stats-grid-2 {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.stats-grid-2 .stat-item {
    text-align: left;
}

.stat-number-large {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-gray);
}

/* ===== 能力列表卡片（AI产品通用） ===== */
.capabilities-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.capabilities-card h3 {
    color: var(--text-dark);
    margin-bottom: 16px;
}

.capabilities-list {
    list-style: none;
    text-align: left;
    color: var(--text-gray);
}

.capabilities-list li {
    margin-bottom: 12px;
}

/* ===== 行动号召区域 ===== */
.cta {
    padding: 100px 0;
    background: var(--primary-blue);
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-description {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 40px;
    background: var(--white);
    color: var(--primary-blue);
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: rgba(255, 255, 255, 0.95);
}

.btn-cta {
    background: var(--white);
    color: var(--primary-blue);
    padding: 16px 40px;
    font-size: 18px;
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-cta-outline {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-cta-outline:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--text-dark);
    color: var(--text-light);
    padding: 60px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 16px;
}

.footer-logo .logo-icon {
    width: 56px;
    height: 56px;
    object-fit: contain;
    object-position: center;
    display: flex;
    flex-shrink: 0;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

.footer-logo .logo-text {
    color: var(--white);
    font-size: 19px;
    font-weight: 700;
    line-height: 1;
    display: flex;
    align-items: center;
    height: 56px;
}

.footer-tagline {
    font-size: 14px;
    color: var(--text-light);
    margin-left: 25px; /* 适当左边距，达到视觉平衡 */
    margin-top: 8px;   /* 与logo保持合适距离 */
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    align-items: start;
}

.footer-links .footer-contact {
    grid-column: 3;
}

.footer-column-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 12px;
}

.footer-company-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
    white-space: nowrap;
}

.footer-list {
    list-style: none;
}

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

.footer-list a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-list a:hover {
    color: var(--white);
}

/* 联系部分优化样式 */
.footer-contact {
    min-width: 0;
}

.footer-contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.6;
}

.footer-contact-label {
    color: var(--text-light);
    font-size: 14px;
    white-space: nowrap;
    flex-shrink: 0;
}

.footer-contact-item a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-email {
    white-space: nowrap;
}

.footer-address {
    white-space: nowrap;
}

.footer-contact-item a:hover {
    color: var(--white);
}

.footer-contact-item span:not(.footer-contact-label) {
    color: var(--text-light);
    font-size: 14px;
}

/* 企业微信部分 */
.footer-wechat-item {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.footer-wechat-title-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-wechat-title {
    color: var(--text-light);
    font-size: 14px;
    white-space: nowrap;
}

.footer-wechat-icon-wrapper {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.footer-wechat-icon {
    width: 20px;
    height: 20px;
    color: var(--text-light);
    cursor: pointer;
    transition: color 0.3s ease;
    flex-shrink: 0;
}

.footer-wechat-icon:hover {
    color: var(--white);
}

.footer-wechat-popup {
    position: absolute;
    bottom: calc(100% + 16px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--white);
    padding: 16px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 1000;
    min-width: 200px;
}

.footer-wechat-icon-wrapper:hover .footer-wechat-popup {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(-8px);
}

.footer-qrcode-popup {
    width: 180px;
    height: 180px;
    display: block;
    border-radius: 8px;
    margin-bottom: 8px;
    opacity: 1 !important;
}

.footer-wechat-popup-hint {
    color: var(--text-dark);
    font-size: 12px;
    text-align: center;
    margin: 0;
}

/* 确保popup不会被遮挡 */
.footer-wechat-popup::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    color: var(--text-light);
}

.footer-bottom p {
    margin-bottom: 8px;
}

.footer-bottom p:last-child {
    margin-bottom: 0;
}

.footer-icp {
    font-size: 14px;
    color: var(--white);
    margin-top: 8px;
}

.footer-icp a {
    color: var(--white);
    text-decoration: none;
}

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

/* ===== 企业微信二维码模态框 ===== */
.wechat-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

.wechat-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.wechat-modal-content {
    background-color: var(--white);
    margin: auto;
    padding: 40px;
    border-radius: 16px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
}

.wechat-modal-content h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.wechat-qrcode {
    width: 100%;
    max-width: 280px;
    height: auto;
    margin: 0 auto 16px;
    display: block;
    border-radius: 8px;
}

.wechat-modal-content p {
    color: var(--text-gray);
    font-size: 14px;
    margin: 0;
}

.wechat-modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    color: var(--text-gray);
    font-size: 32px;
    font-weight: 300;
    cursor: pointer;
    line-height: 1;
    transition: all 0.3s ease;
    background: none;
    border: none;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.wechat-modal-close:hover {
    color: var(--text-dark);
    transform: rotate(90deg);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 联系方式模态框扩展样式 ===== */
.contact-modal-content {
    max-width: 500px;
    text-align: left;
}

.contact-options {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 24px;
}

.contact-option {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    transition: all 0.3s ease;
    background: var(--white);
}

.contact-option:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--hero-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    flex-shrink: 0;
}

.contact-details {
    flex: 1;
}

.contact-details h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.contact-details p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 12px;
    line-height: 1.4;
}

.contact-btn {
    background: var(--gray-100);
    color: var(--text-dark);
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact-btn:hover {
    background: var(--gray-200);
    transform: translateY(-1px);
}

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

.contact-btn-primary:hover {
    background: var(--dark-blue);
}

.contact-note {
    text-align: center;
    font-size: 14px;
    color: var(--text-light);
    padding-top: 16px;
    border-top: 1px solid var(--gray-200);
    margin-bottom: 0;
}

/* ===== 联系方式模态框响应式设计 ===== */
@media (max-width: 768px) {
    .contact-modal-content {
        max-width: 95%;
        padding: 24px 20px;
    }
    
    .contact-option {
        flex-direction: column;
        text-align: center;
        padding: 16px;
        gap: 12px;
    }
    
    .contact-icon {
        width: 40px;
        height: 40px;
        margin: 0 auto;
    }
    
    .contact-details h4 {
        font-size: 16px;
        margin-bottom: 8px;
    }
    
    .contact-details p {
        font-size: 13px;
        margin-bottom: 16px;
    }
    
    .contact-btn {
        width: 100%;
        padding: 12px 20px;
        font-size: 16px;
    }
}

/* ===== 响应式设计 ===== */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 84px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 84px);
        background: var(--white);
        flex-direction: column;
        padding: 40px 20px;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-cta {
        font-size: 14px;
        padding: 8px 16px;
        text-align: center;
    }

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

    .hero-title {
        font-size: 36px;
    }

    .hero-video {
        height: auto;
    }

    .solutions-grid,
    .solutions-grid-3 {
        grid-template-columns: 1fr;
    }

    .about-hero-title {
        font-size: 36px;
    }

    .about-hero-description {
        font-size: 18px;
    }

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

    .about-image {
        aspect-ratio: 16 / 9;
        order: -1;
    }
    
    .about-text {
        padding-top: 0;
    }

    .about-stats {
        justify-content: space-around;
    }

    .about-advantages {
        grid-template-columns: 1fr;
    }

    .about-advantages-section {
        margin-top: 60px;
    }

    .about-text {
        padding-left: 0;
    }
    
    .about-text .section-title {
        font-size: 32px;
        margin-bottom: 20px;
        color: #101C36;
    }
    
    .about-description {
        color: #4A4A4A;
    }

    .about-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .values-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .cta-buttons .btn {
        width: 100%;
        max-width: 100%;
    }

    /* AI产品通用样式响应式 */
    .hero-features {
        gap: 20px;
        font-size: 13px;
    }

    .stats-grid-2 {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .capabilities-card {
        padding: 24px;
    }

    .cta-button {
        width: 100%;
        font-size: 16px;
        padding: 14px 32px;
    }

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

    .footer-links {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-contact-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    
    .footer-contact-label {
        white-space: normal;
    }
    
    .footer-wechat-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .footer-wechat-popup {
        bottom: auto;
        top: calc(100% + 12px);
        left: 0;
        transform: translateX(0);
    }
    
    .footer-wechat-icon-wrapper:hover .footer-wechat-popup {
        transform: translateX(0) translateY(0);
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-description {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 32px; /* 统一标题大小 */
    }
    
    .section-subtitle {
        font-size: 14px;
    }

    .about-hero {
        padding: 60px 0;
    }

    .about-hero-title {
        font-size: 32px;
    }

    .about-hero-description {
        font-size: 16px;
    }
    
    .about-content {
        gap: 40px;
    }
    
    .about-image {
        border-radius: 12px;
        box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1), 0 4px 16px rgba(0, 0, 0, 0.06);
    }
    
    .about-image:hover {
        transform: none;
        box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1), 0 4px 16px rgba(0, 0, 0, 0.06);
    }
    
    .about-text {
        animation: none;
        opacity: 1;
    }
    
    .about-text .section-title {
        font-size: 28px;
        margin-bottom: 16px;
        color: #101C36;
    }
    
    .about-description {
        font-size: 16px;
        line-height: 1.75;
        margin-bottom: 18px;
        color: #4A4A4A;
    }
    
    .about-description:first-of-type {
        font-size: 16px;
        margin-bottom: 20px;
        color: #4A4A4A;
    }

    .cta-title {
        font-size: 32px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .about-stats {
        flex-direction: column;
        gap: 32px;
    }

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

    .stat-number-large {
        font-size: 48px;
    }

    .stat-label-large {
        font-size: 16px;
    }

    .value-card {
        padding: 32px 24px;
    }

    .value-icon {
        width: 64px;
        height: 64px;
    }

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

/* ===== 动画效果 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 返回顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

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

.back-to-top:hover {
    background: var(--dark-blue);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

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

/* ===== 页面加载动画 ===== */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===== 图片懒加载占位符 ===== */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Footer logo 不应该被懒加载规则影响 */
.footer-logo .logo-icon {
    opacity: 1 !important;
}

/* ===== 优化视频加载 ===== */
.hero-video {
    background: var(--gray-100);
}

/* ===== 改进按钮焦点状态 ===== */
.btn:focus-visible,
.back-to-top:focus-visible,
.nav-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2), 
                0 0 0 4px rgba(37, 99, 235, 0.1);
    border-radius: 6px;
}

/* ===== 改进链接焦点状态 ===== */
a:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
    border-radius: 4px;
    background: rgba(37, 99, 235, 0.05);
}

/* ===== 平滑滚动优化 ===== */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

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

/* ===== 工具类（提取自内联样式） ===== */

/* Hero页面徽章组 */
.hero-badges {
    margin-top: 24px;
    display: flex;
    gap: 32px;
    color: var(--text-gray);
    font-size: 14px;
}

.hero-badge-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-badge-icon {
    width: 18px;
    height: 18px;
    color: var(--primary-blue);
}

/* 统计数据网格 */
.stat-grid-2x2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 32px;
}

.stat-grid-item {
    text-align: left;
}

.large-stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 8px;
    line-height: 1;
}

.large-stat-label {
    color: var(--text-gray);
    font-size: 16px;
}

/* 能力卡片 */
.capability-card {
    background: var(--white);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.capability-card-title {
    color: var(--text-dark);
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 32px;
    text-align: center;
}

.capability-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.capability-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.capability-icon {
    width: 24px;
    height: 24px;
    color: #10b981;
    flex-shrink: 0;
    margin-top: 2px;
}

.capability-text {
    color: var(--text-dark);
    font-size: 16px;
    line-height: 1.6;
}

/* 大标题样式 */
.section-title-large {
    text-align: left;
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 24px;
}

.section-description-large {
    font-size: 18px;
    margin-bottom: 32px;
}

/* 特性列表 */
.feature-list {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 0;
    flex-shrink: 0;
}

.feature-content h3 {
    color: var(--text-dark);
    margin-bottom: 8px;
    font-size: 20px;
}

.feature-content p {
    color: var(--text-gray);
    line-height: 1.8;
}

/* 平台网格 */
.platform-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.platform-card {
    text-align: center;
    cursor: default;
    padding: 24px;
    border: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.platform-icon-wrapper {
    margin: 0 auto 16px;
    width: 64px;
    height: 64px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.platform-icon {
    width: 40px;
    height: 40px;
}

.platform-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
    text-align: center;
}

/* 响应式调整 */
@media (max-width: 968px) {
    .hero-badges {
        flex-direction: column;
        gap: 16px;
    }

    .stat-grid-2x2 {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .platform-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-title-large {
        font-size: 32px;
    }

    .large-stat-number {
        font-size: 40px;
    }
}

@media (max-width: 640px) {
    .platform-grid-4 {
        grid-template-columns: 1fr;
    }

    .feature-item {
        flex-direction: column;
    }
}