.index_main {
    position: relative;
    width: 100%;
    min-height: 200px;
    display: block;
    margin: 0 auto;
    overflow: hidden; 
}
.index_mainbox {
    position: relative;
    width: 100%;
    max-width: 1200px;
    display: block;
    margin: 0 auto;

}

.viber-hero-wrapper {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        background: linear-gradient(135deg, #7360f2 0%, #663fb5 100%);
        min-height: 600px;
        padding: 80px 40px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #ffffff;
        overflow: hidden;
        box-sizing: border-box;
    }

    .viber-container {
        max-width: 1200px;
        width: 100%;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
        gap: 60px;
    }

    /* 左侧内容区 */
    .viber-content {
        flex: 1;
        min-width: 320px;
        max-width: 550px;
    }

    .viber-logo {
        width: 60px;
        height: 60px;
        margin-bottom: 15px; /* 缩减离下方文字的间距 */
    }

    .viber-logo img {
        width: 100%;
        height: 100%;
        object-fit: contain;
        filter: brightness(0) invert(1); /* CSS 反白处理 */
        animation: logoFloat 4s ease-in-out infinite;
    }

    .viber-title {
        font-size: 52px;
        line-height: 1.1;
        font-weight: 300;
        margin: 0 0 30px 0;
        color: rgba(255, 255, 255, 0.95);
    }

    .viber-subtitle {
        font-size: 18px;
        line-height: 1.6;
        margin: 0 0 40px 0;
        color: rgba(255, 255, 255, 0.8);
        font-weight: 400;
    }

    .viber-btn {
        display: inline-block;
        background-color: #78be20;
        color: #ffffff;
        text-decoration: none;
        padding: 16px 45px;
        font-size: 18px;
        font-weight: bold;
        border-radius: 50px;
        transition: all 0.3s ease;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    }

    .viber-btn:hover {
        background-color: #68a81b;
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    }

    /* 多端下载区域 */
    .viber-platforms {
        margin-top: 30px;
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
    }

    .platform-link {
        display: flex;
        align-items: center;
        gap: 8px;
        color: rgba(255, 255, 255, 0.85);
        text-decoration: none;
        font-size: 14px;
        transition: color 0.2s;
    }

    .platform-link:hover {
        color: #ffffff;
    }

    .platform-icon {
        width: 20px;
        height: 20px;
        fill: currentColor;
    }

    .viber-web-link {
        margin-top: 20px;
        font-size: 14px;
        color: rgba(255, 255, 255, 0.7);
    }

    .viber-web-link a {
        color: #ffffff;
        text-decoration: underline;
        font-weight: 500;
        margin-left: 5px;
    }

    /* 功能特性区域 */
    .viber-features-section {
        background: #ffffff;
        padding: 100px 20px;
        text-align: center;
        color: #1e293b;
    }

    .features-header {
        max-width: 800px;
        margin: 0 auto 80px;
    }

    .features-title {
        font-size: 42px;
        font-weight: 300;
        margin-bottom: 20px;
        color: #334155;
    }

    .features-subtitle {
        font-size: 16px;
        color: #64748b;
        line-height: 1.6;
    }

    .features-grid {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
    }

    .feature-card {
        padding: 20px;
        transition: transform 0.3s ease;
    }

    .feature-card:hover {
        transform: translateY(-5px);
    }

    .feature-image-box {
        width: 100%;
        height: 180px;
        margin-bottom: 30px;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
    }

    .feature-image-box img {
        max-width: 100%;
        max-height: 100%;
        object-fit: contain;
    }

    .feature-name {
        font-size: 20px;
        font-weight: 700;
        color: #334155;
        margin-bottom: 15px;
    }

    .feature-desc {
        font-size: 14px;
        color: #64748b;
        line-height: 1.7;
        padding: 0 10px;
    }

    /* 数据统计区域 */
    .viber-stats-section {
        background: #4a2d8a;
        padding: 80px 20px;
        color: #ffffff;
        text-align: center;
    }

    .stats-grid {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 30px;
    }

    .stat-item {
        padding: 20px;
    }

    .stat-number {
        font-size: 48px;
        font-weight: 800;
        margin-bottom: 10px;
        display: block;
        color: #78be20; /* 使用 Viber 绿色突出数字 */
    }

    .stat-label {
        font-size: 16px;
        color: rgba(255, 255, 255, 0.8);
        font-weight: 500;
    }

    /* FAQ 常见问题区域 */
    .viber-faq-section {
        background: #ffffff;
        padding: 100px 20px;
        color: #1e293b;
    }

    .faq-container {
        max-width: 900px;
        margin: 0 auto;
        text-align: left;
    }

    .faq-title {
        font-size: 32px;
        font-weight: 700;
        text-align: center;
        margin-bottom: 60px;
        color: #334155;
    }

    .faq-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 30px 50px;
    }

    .faq-item {
        margin-bottom: 10px;
    }

    .faq-question {
        font-size: 18px;
        font-weight: 700;
        color: #334155;
        margin-bottom: 12px;
        display: flex;
        align-items: flex-start;
        gap: 10px;
    }

    .faq-question::before {
        content: "Q:";
        color: #7360f2;
        font-weight: 800;
    }

    .faq-answer {
        font-size: 15px;
        color: #64748b;
        line-height: 1.7;
        padding-left: 28px;
    }

    /* 客户反馈区域 */
    .viber-testimonials-section {
        background: #f8fafc;
        padding: 100px 20px;
        text-align: center;
    }

    .testimonials-title {
        font-size: 36px;
        font-weight: 700;
        color: #1e293b;
        margin-bottom: 60px;
    }

    .testimonials-grid {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 30px;
    }

    .testimonial-card {
        background: #ffffff;
        padding: 40px 30px;
        border-radius: 16px;
        box-shadow: 0 4px 20px rgba(0,0,0,0.04);
        text-align: left;
        position: relative;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        transition: transform 0.3s ease;
    }

    .testimonial-card:hover {
        transform: translateY(-10px);
    }

    .quote-icon {
        font-size: 40px;
        color: #7360f2;
        opacity: 0.2;
        position: absolute;
        top: 20px;
        left: 20px;
        font-family: serif;
    }

    .testimonial-text {
        font-size: 16px;
        color: #475569;
        line-height: 1.8;
        margin-bottom: 30px;
        position: relative;
        z-index: 1;
    }

    .testimonial-footer {
        display: flex;
        align-items: center;
        gap: 15px;
    }

    .author-avatar {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: #e2e8f0;
        object-fit: cover;
    }

    .author-info {
        display: flex;
        flex-direction: column;
    }

    .author-name {
        font-size: 15px;
        font-weight: 700;
        color: #1e293b;
    }

    .author-country {
        font-size: 13px;
        color: #64748b;
        display: flex;
        align-items: center;
        gap: 5px;
    }

    /* 右侧手机模型区 */
    .viber-visual {
        flex: 1;
        display: flex;
        justify-content: center;
        align-items: center;
        min-width: 320px;
    }

    /* 纯 CSS 手机模型 */
    .viber-phone {
        width: 300px;
        height: 600px;
        background: #fdfdfd;
        border-radius: 40px;
        border: 8px solid #4a2d8a;
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        position: relative;
        overflow: hidden;
        display: flex;
        flex-direction: column;
        animation: phoneFloat 6s ease-in-out infinite;
    }

    /* 手机顶部栏 */
    .phone-header {
        height: 70px;
        background: #ffffff;
        display: flex;
        align-items: center;
        padding: 0 15px;
        border-bottom: 1px solid #f0f0f0;
        gap: 12px;
    }

    .phone-back-arrow {
        width: 24px;
        height: 24px;
        color: #7360f2;
    }

    .group-info {
        flex: 1;
    }

    .group-name {
        font-size: 15px;
        font-weight: bold;
        color: #1e1e1e;
        margin: 0;
    }

    .group-members {
        font-size: 11px;
        color: #9e9e9e;
        margin: 2px 0 0 0;
    }

    /* 聊天内容区 */
    .chat-body {
        flex: 1;
        background: #f4f4f9;
        padding: 15px;
        overflow-y: auto;
    }

    .chat-bubble {
        max-width: 85%;
        margin-bottom: 15px;
        opacity: 0;
        transform: translateY(20px) scale(0.9);
        animation: bubbleIn 8s cubic-bezier(0.175, 0.885, 0.32, 1.275) infinite;
    }

    .chat-bubble:nth-child(2) { animation-delay: 0.5s; }
    .chat-bubble:nth-child(3) { animation-delay: 2s; }
    .chat-bubble:nth-child(4) { animation-delay: 3.5s; }

    .user-avatar {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        background: #dcdde1;
        margin-bottom: 4px;
        overflow: hidden;
    }

    .message-container {
        display: flex;
        gap: 8px;
        align-items: flex-start;
    }

    .bubble-content {
        background: #ffffff;
        padding: 10px 14px;
        border-radius: 4px 18px 18px 18px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    }

    .sender-name {
        font-size: 12px;
        font-weight: bold;
        color: #7360f2;
        margin-bottom: 4px;
    }

    .message-text {
        font-size: 13px;
        color: #4a4a4a;
        margin: 0;
        line-height: 1.4;
    }

    .message-image {
        width: 100%;
        border-radius: 12px;
        margin-top: 8px;
        background: #e1e2e6;
        height: 140px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #a0a0a0;
        font-size: 12px;
        position: relative;
        overflow: hidden;
    }

    .message-image::after {
        content: "Photo message";
    }

    /* 底部输入框 */
    .phone-footer {
        height: 60px;
        background: #ffffff;
        border-top: 1px solid #f0f0f0;
        display: flex;
        align-items: center;
        padding: 0 15px;
        gap: 10px;
    }

    .input-mock {
        flex: 1;
        height: 36px;
        background: #f0f2f5;
        border-radius: 18px;
        padding: 0 15px;
        font-size: 12px;
        color: #9e9e9e;
        display: flex;
        align-items: center;
    }

    .send-btn-mock {
        width: 36px;
        height: 36px;
        background: #7360f2;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        animation: btnPulse 2s infinite;
    }

    /* 动画定义 */
    @keyframes phoneFloat {
        0%, 100% { transform: translateY(0); }
        50% { transform: translateY(-15px); }
    }

    @keyframes bubbleIn {
        0% { opacity: 0; transform: translateY(20px) scale(0.9); }
        5%, 90% { opacity: 1; transform: translateY(0) scale(1); }
        95%, 100% { opacity: 0; transform: translateY(0) scale(1); }
    }

    @keyframes btnPulse {
        0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(115, 96, 242, 0.7); }
        70% { transform: scale(1.05); box-shadow: 0 0 0 10px rgba(115, 96, 242, 0); }
        100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(115, 96, 242, 0); }
    }

    @keyframes logoFloat {
        0%, 100% { transform: rotate(0deg) scale(1); }
        50% { transform: rotate(5deg) scale(1.05); }
    }

    /* 响应式调整 */
    @media (max-width: 768px) {
        .viber-container {
            flex-direction: column;
            text-align: center;
            padding-top: 20px;
        }
        .viber-title {
            font-size: 38px;
        }
        .viber-content {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
    }