/* 飞书官网样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3370ff;
    --primary-hover: #2859e6;
    --text-color: #1f2329;
    --text-secondary: #646a73;
    --bg-light: #f5f6f7;
    --border-color: #e5e6eb;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background: #fff;
}

.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-outline:hover {
    background: rgba(51, 112, 255, 0.05);
}

.btn-large {
    padding: 14px 36px;
    font-size: 16px;
}

.btn-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.btn-link:hover {
    text-decoration: underline;
}

/* 头部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo img {
    height: 32px;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-item {
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.search-btn:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

/* 首屏英雄区 */
.hero {
    padding: 140px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, #f0f5ff 0%, #fff 100%);
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #3370ff 0%, #5b8def 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-bottom: 32px;
}

.hero-trust {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.client-logos {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.client-logos img {
    height: 32px;
    opacity: 0.6;
    transition: opacity 0.3s;
}

.client-logos img:hover {
    opacity: 1;
}

/* 通用区块样式 */
section {
    padding: 80px 0;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 48px;
}

/* 痛点对比 */
.comparison {
    background: var(--bg-light);
}

.comparison-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.comparison-card {
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.comparison-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.card-header h3 {
    font-size: 20px;
    margin-bottom: 24px;
    color: var(--primary-color);
}

.traditional, .feishu-way {
    margin-bottom: 20px;
}

.traditional h4, .feishu-way h4 {
    font-size: 14px;
    margin-bottom: 8px;
}

.traditional h4 {
    color: var(--text-secondary);
}

.feishu-way h4 {
    color: var(--primary-color);
}

.traditional p {
    color: var(--text-secondary);
    font-size: 14px;
}

.feishu-way p {
    color: var(--text-color);
    font-size: 14px;
}

/* 产品能力 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.product-item {
    display: block;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.product-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.product-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-icon img {
    width: 100%;
    height: 100%;
}

.product-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.product-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 行业解决方案 */
.solutions {
    background: var(--bg-light);
}

.solution-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.tab-item {
    padding: 10px 24px;
    border-radius: 24px;
    background: #fff;
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}

.tab-item:hover, .tab-item.active {
    background: var(--primary-color);
    color: #fff;
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.solution-text h3 {
    font-size: 28px;
    margin-bottom: 16px;
}

.solution-text p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.solution-image img {
    width: 100%;
    border-radius: 12px;
}

/* 客户案例 */
.case-carousel {
    max-width: 800px;
    margin: 0 auto 48px;
}

.case-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 48px;
    text-align: center;
}

.case-logo {
    height: 48px;
    margin-bottom: 24px;
}

.case-quote {
    font-size: 20px;
    font-style: italic;
    color: var(--text-color);
    margin-bottom: 24px;
}

.logo-wall {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.logo-wall img {
    height: 40px;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: all 0.3s;
}

.logo-wall img:hover {
    filter: grayscale(0%);
    opacity: 1;
}

.trust-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* 安全合规 */
.security {
    background: linear-gradient(180deg, #f8f9ff 0%, #fff 100%);
}

.security-badges {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.badge-item {
    text-align: center;
}

.badge-item img {
    width: 80px;
    height: 80px;
    margin-bottom: 12px;
}

.badge-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

.security-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    margin-bottom: 48px;
}

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

.stat-number {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.security-actions {
    display: flex;
    justify-content: center;
    gap: 24px;
    align-items: center;
}

/* 多端体验 */
.multi-device {
    text-align: center;
}

.device-showcase {
    display: flex;
    justify-content: center;
    gap: 64px;
    margin-top: 48px;
}

.device-item {
    text-align: center;
}

.device-item img {
    width: 200px;
    height: auto;
    margin-bottom: 16px;
}

.device-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* FAQ与CTA */
.faq-cta {
    background: var(--bg-light);
}

.faq-cta .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
}

.faq-list {
    margin-top: 32px;
}

.faq-item {
    background: #fff;
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 16px;
}

.faq-item h3 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--text-color);
}

.faq-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.cta-section {
    background: linear-gradient(135deg, #3370ff 0%, #5b8def 100%);
    border-radius: 16px;
    padding: 48px;
    color: #fff;
    text-align: center;
}

.cta-title {
    font-size: 28px;
    margin-bottom: 32px;
}

.cta-form {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.cta-form input {
    flex: 1;
    padding: 12px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    background: rgba(255, 255, 255, 0.9);
}

.cta-form button {
    padding: 12px 24px;
    background: #fff;
    color: var(--primary-color);
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.cta-form button:hover {
    background: #f0f0f0;
}

.cta-alt {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 16px;
}

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

.social-btn {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}

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

/* 底部 */
.footer {
    background: #1f2329;
    color: #fff;
    padding: 64px 0 32px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 48px;
    margin-bottom: 48px;
}

.footer-column h4 {
    font-size: 14px;
    margin-bottom: 16px;
    color: #fff;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 13px;
    margin-bottom: 10px;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: #fff;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-legal {
    display: flex;
    gap: 24px;
    align-items: center;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 13px;
}

.footer-legal a:hover {
    color: #fff;
}

.footer-legal span {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transition: all 0.2s;
}

.footer-social a:hover {
    background: rgba(255, 255, 255, 0.2);
}

.footer-social img {
    width: 18px;
    height: 18px;
}

.footer-sitemap {
    text-align: center;
    margin-top: 24px;
}

.footer-sitemap a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-size: 12px;
}

.footer-sitemap a:hover {
    color: #fff;
}

/* 响应式 */
@media (max-width: 1024px) {
    .comparison-cards {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .solution-content {
        grid-template-columns: 1fr;
    }
    
    .faq-cta .container {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .security-stats {
        flex-direction: column;
        gap: 32px;
    }
    
    .device-showcase {
        flex-direction: column;
        gap: 32px;
    }
    
    .cta-form {
        flex-direction: column;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 24px;
    }
}