:root {
    --primary: #0052D9;
    --primary-dark: #0046B8;
    --primary-light: #1B6FE4;
    --secondary: #00B8A9;
    --dark: #2C3E50;
    --gray: #64748B;
    --light: #F8FAFC;
    --white: #FFFFFF;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.15);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
}

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

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

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

/* 主横幅样式 */
.hero {
    padding: 223px 0 137px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../images/private-flow/hero-bg.webp');
    background-size: cover;
    background-position: center;
    z-index: 1;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgb(0 0 0 / 90%), rgb(103 129 211 / 30%));
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: left;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-text h1 {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 24px;
    font-weight: 600;
}

.hero-text p {
    font-size: 20px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.hero-btns {
    display: flex;
    gap: 20px;
}

.primary-btn {
    background: var(--white);
    color: var(--primary);
    padding: 16px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

/* 解决方案优势样式 */
.advantages {
    padding: 100px 0;
    background: var(--white);
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    color: var(--dark);
    position: relative;
    padding-bottom: 20px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.advantage-card {
    text-align: center;
    padding: 40px 30px;
    background: var(--white);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: var(--white);
    font-size: 32px;
}

.advantage-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--dark);
}

.advantage-card p {
    color: var(--gray);
}

/* 应用场景样式 */
.scenarios {
    padding: 100px 0;
    background: var(--light);
    position: relative;
    overflow: hidden;
}

.scenarios::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--primary), transparent);
}

.app-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.feature-module {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.feature-module:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.module-preview {
    width: 100%;
    padding: 20px;
    background: #f8f9fa;
    border-bottom: 1px solid #eee;
}

.module-preview img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.module-info {
    padding: 24px;
    text-align: center;
}

.module-info h3 {
    font-size: 24px;
    color: var(--dark);
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

.module-info h3::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-module:hover .module-info h3::after {
    transform: scaleX(1);
}

.module-info p {
    color: var(--gray);
    font-size: 16px;
    line-height: 1.6;
}

/* 数据分析样式 */
.analytics {
    padding: 100px 0;
    background: var(--light);
}

.analytics-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

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

.analytics-text h3 {
    font-size: 32px;
    margin-bottom: 24px;
    color: var(--dark);
}

.analytics-list {
    list-style: none;
    margin-bottom: 32px;
}

.analytics-list li {
    margin-bottom: 16px;
    padding-left: 30px;
    position: relative;
    color: var(--gray);
}

.analytics-list li::before {
    content: "→";
    color: var(--primary);
    position: absolute;
    left: 0;
}

.analytics-btn {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 14px 36px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.analytics-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.analytics-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}



/* 核心优势样式 */
.core-advantages {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--light), #ffffff);
    position: relative;
    overflow: hidden;
}

.core-advantages::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--primary), transparent);
}

.core-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.core-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative;
    box-shadow: var(--shadow-sm);
}

.core-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.core-card:hover {
    transform: translateY(-15px);
}

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

.core-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 32px;
    position: relative;
    overflow: hidden;
}

.core-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: 0.5s;
}

.core-card:hover .core-icon::before {
    left: 100%;
}

.core-card h3 {
    color: var(--dark);
    font-size: 22px;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 16px;
}

.core-card h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: var(--primary);
}

.core-card p {
    color: var(--gray);
    line-height: 1.8;
    margin: 0;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .app-features {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .features-showcase,
    .analytics-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .features-preview {
        height: 400px;
        order: -1;
    }

    .core-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

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

    .scenario-preview {
        order: -1;
    }

    .scenario-preview::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .advantages-grid,
    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-text h1 {
        font-size: 36px;
    }

    .section-title {
        font-size: 30px;
    }

    .app-features {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }

    .module-info h3 {
        font-size: 20px;
    }

    .module-info p {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .advantages-grid,
    .scenarios-grid {
        grid-template-columns: 1fr;
    }

    .hero-text h1 {
        font-size: 32px;
    }

    .hero-text p {
        font-size: 16px;
    }

    .preview-text h4 {
        font-size: 20px;
    }

    .core-grid {
        grid-template-columns: 1fr;
    }
    
    .core-card {
        padding: 30px 20px;
    }

    .tab-btn {
        width: calc(50% - 10px);
        justify-content: center;
    }
}