/* ========================================
   VELN 响应式优化 CSS - 专注移动端空间优化
   ======================================== */

/* ========================================
   移动端优化 (≤640px)
   ======================================== */
@media (max-width: 640px) {
    
    /* Hero区域 - 减少空白 */
    .hero {
        padding: 90px 1rem 30px !important;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .hero-badge {
        margin-bottom: 0.75rem;
    }

    .hero-title {
        font-size: 1.75rem;
        margin-bottom: 0.75rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
        margin-bottom: 1.25rem;
    }

    .hero-cta {
        gap: 0.75rem;
    }

    /* 按钮保持原有大小，不要变大 */
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.95rem;
    }

    /* 统计数据 - 紧凑显示 */
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
        margin-top: 1.5rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-suffix {
        font-size: 1.125rem;
    }

    .stat-label {
        font-size: 0.75rem;
    }

    /* 设备展示 - 紧凑 */
    .devices-showcase {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }

    .device-card {
        padding: 1rem 0.75rem;
    }

    .device-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
        margin-bottom: 0.5rem;
    }

    .device-name {
        font-size: 0.85rem;
    }

    /* 信任标识 - 减少空白 */
    .trust-section {
        padding: 2rem 1rem;
    }

    .trust-title {
        margin-bottom: 1rem;
    }

    .trust-logos {
        gap: 0.75rem;
    }

    .trust-item {
        padding: 0.625rem 1rem;
    }

    .trust-icon {
        font-size: 1.25rem;
    }

    .trust-text {
        font-size: 0.85rem;
    }

    /* 所有区块 - 减少间距 */
    .features,
    .pricing,
    .cta-section,
    .testimonials,
    .iplc-section {
        padding: 2.5rem 1rem !important;
    }

    /* 区块标题 - 减少空白 */
    .section-header {
        margin-bottom: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }

    .section-subtitle {
        font-size: 0.9rem;
    }

    /* 功能卡片 - 紧凑 */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .feature-card {
        padding: 1.25rem 1rem;
    }

    .feature-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
        margin-bottom: 0.75rem;
    }

    .feature-title {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }

    .feature-description {
        font-size: 0.85rem;
        line-height: 1.5;
    }

    /* 价格卡片 - 极简折叠方案（仅移动端） */
    /* 使用更高优先级覆盖HTML内联样式 */
    .pricing-grid {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: 0.875rem !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    .pricing-card,
    .pricing-card.featured {
        padding: 1rem !important;
        margin: 0 !important;
        position: relative;
        transition: none !important;
        overflow: visible !important;
        box-sizing: border-box !important;
        max-width: 100% !important;
        width: 100% !important;
        transform: none !important;
    }

    .pricing-card:hover,
    .pricing-card.featured:hover {
        transform: none !important;
        padding: 1rem !important;
    }

    .pricing-card.expanded,
    .pricing-card.featured.expanded {
        padding: 1rem !important;
        transform: none !important;
    }

    .pricing-badge {
        top: -8px !important;
        font-size: 0.7rem !important;
        padding: 0.25rem 0.75rem !important;
        left: 50% !important;
        transform: translateX(-50%) !important;
        position: absolute !important;
    }

    /* 头部布局：套餐名+价格在左，查看详情按钮在右 */
    .pricing-card-header {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        margin-bottom: 0;
    }

    .pricing-left {
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
        flex: 1;
    }

    .pricing-name {
        font-size: 1.25rem !important;
        margin-bottom: 0 !important;
        font-weight: 700;
        line-height: 1.2;
    }

    .pricing-period {
        font-size: 0.875rem;
        color: var(--gray);
        margin-top: 0;
        line-height: 1.2;
        display: flex;
        align-items: baseline;
        gap: 0.25rem;
    }

    .pricing-price {
        font-size: 1.5rem !important;
        margin-bottom: 0 !important;
        display: inline-flex !important;
        align-items: baseline !important;
        font-weight: 700;
        line-height: 1;
        color: var(--primary);
    }

    .pricing-currency {
        font-size: 1rem !important;
        margin-right: 0.125rem;
    }

    /* 隐藏摘要信息 */
    .pricing-summary {
        display: none !important;
    }

    .pricing-right {
        display: none !important;
    }

    /* 查看详情按钮 - 透明边框样式 */
    .pricing-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.375rem;
        padding: 0.5rem 1rem !important;
        margin: 0;
        background: transparent !important;
        color: white !important;
        border: 1.5px solid rgba(255, 255, 255, 0.3) !important;
        border-radius: 50px;
        font-size: 0.75rem;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.3s ease;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .pricing-toggle:hover {
        background: rgba(255, 255, 255, 0.1) !important;
        border-color: rgba(255, 255, 255, 0.5) !important;
        transform: translateY(-1px) !important;
    }

    .pricing-toggle:active {
        transform: translateY(0) !important;
    }

    .pricing-toggle i {
        font-size: 0.7rem;
        transition: transform 0.3s ease;
        color: white;
    }

    .pricing-card.expanded .pricing-toggle {
        background: rgba(255, 255, 255, 0.1) !important;
        border-color: rgba(255, 255, 255, 0.4) !important;
    }

    .pricing-card.expanded .pricing-toggle i {
        transform: rotate(180deg);
    }

    /* 详细功能列表 - 默认隐藏 */
    .pricing-features {
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        margin: 0 !important;
        padding: 0 !important;
        border: none !important;
        transition: all 0.3s ease;
    }

    .pricing-card.expanded .pricing-features {
        max-height: 700px;
        opacity: 1;
        margin: 1rem 0 0 0 !important;
        padding: 1rem 0 0 0 !important;
        border-top: 1px solid rgba(0, 0, 0, 0.1) !important;
    }

    .pricing-feature {
        padding: 0.5rem 0;
        font-size: 0.85rem;
        gap: 0.5rem;
        display: flex;
        align-items: flex-start;
    }

    .pricing-feature i {
        font-size: 0.875rem;
        margin-top: 0.125rem;
        flex-shrink: 0;
    }

    .pricing-feature span {
        flex: 1;
        line-height: 1.4;
    }

    /* 订购按钮 - 在展开区域内 */
    .pricing-cta {
        padding: 0.75rem !important;
        font-size: 0.875rem;
        margin-top: 1rem !important;
        width: 100%;
        text-align: center;
        display: block;
    }

    /* 客户评价 - 紧凑 */
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .testimonial-card {
        padding: 1.25rem 1rem;
    }

    .testimonial-card::before {
        font-size: 3rem;
        top: 0.5rem;
        left: 1rem;
    }

    .testimonial-rating {
        margin-bottom: 0.75rem;
    }

    .testimonial-rating i {
        font-size: 0.95rem;
    }

    .testimonial-text {
        font-size: 0.85rem;
        margin-bottom: 1rem;
        line-height: 1.6;
    }

    .author-avatar {
        width: 36px;
        height: 36px;
        font-size: 0.95rem;
    }

    .author-name {
        font-size: 0.9rem;
    }

    .author-title {
        font-size: 0.75rem;
    }

    /* IPLC区域 - 紧凑 */
    .iplc-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .iplc-badge {
        font-size: 0.75rem;
        padding: 0.375rem 0.875rem;
        margin-bottom: 0.75rem;
    }

    .iplc-title {
        font-size: 1.5rem;
        margin-bottom: 0.75rem;
    }

    .iplc-description {
        font-size: 0.9rem;
        margin-bottom: 1rem;
    }

    .iplc-features {
        gap: 0.75rem;
        margin-bottom: 1rem;
    }

    .iplc-feature-item {
        padding: 0.875rem;
    }

    .iplc-feature-icon {
        width: 32px;
        height: 32px;
        font-size: 0.95rem;
    }

    .iplc-feature-title {
        font-size: 0.9rem;
    }

    .iplc-feature-desc {
        font-size: 0.8rem;
    }

    .canvas-wrapper {
        height: 250px;
    }

    /* CTA区域 - 紧凑 */
    .cta-title {
        font-size: 1.5rem;
        margin-bottom: 0.75rem;
    }

    .cta-subtitle {
        font-size: 0.9rem;
        margin-bottom: 1.25rem;
    }

    /* 页脚 - 紧凑 */
    .footer {
        padding: 1.5rem 1rem;
    }

    .footer-content {
        gap: 1.5rem;
    }
}

/* ========================================
   平板端优化 (641px - 1024px)
   ======================================== */
@media (min-width: 641px) and (max-width: 1024px) {
    
    /* 隐藏移动端专用元素 */
    .pricing-summary,
    .pricing-toggle {
        display: none !important;
    }

    /* 恢复桌面端布局 */
    .pricing-card-header {
        display: block !important;
    }

    .pricing-name {
        font-size: 1.5rem !important;
        margin-bottom: 1rem !important;
    }

    .pricing-price {
        font-size: 3rem !important;
        margin-bottom: 0.5rem !important;
    }

    .pricing-currency {
        font-size: 1.75rem !important;
    }

    .pricing-period {
        font-size: 1rem;
        margin-top: 0;
    }

    .pricing-features {
        max-height: none !important;
        opacity: 1 !important;
        margin: 2rem 0 !important;
        padding: 2rem 0 !important;
        border-top: 1px solid rgba(0, 0, 0, 0.1) !important;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1) !important;
    }

    .pricing-feature {
        padding: 0.75rem 0;
        font-size: 1rem;
    }

    .pricing-cta {
        padding: 1rem 2rem !important;
        font-size: 1rem;
    }
    
    .hero {
        padding: 110px 1.5rem 60px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.05rem;
    }

    .hero-stats {
        gap: 1.25rem;
    }

    .devices-showcase {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }

    .trust-section {
        padding: 2.5rem 1.5rem;
    }

    .features,
    .pricing,
    .cta-section,
    .testimonials {
        padding: 4rem 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }

    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }

    .pricing-card {
        padding: 1.75rem 1.5rem;
    }

    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }

    .iplc-section {
        padding: 4rem 1.5rem;
    }

    .iplc-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .iplc-title {
        font-size: 2rem;
    }

    .canvas-wrapper {
        height: 350px;
    }
}

/* ========================================
   桌面端 - 保持原样
   ======================================== */
@media (min-width: 1025px) {
    /* 隐藏移动端专用元素 */
    .pricing-summary,
    .pricing-toggle {
        display: none !important;
    }

    /* 恢复桌面端布局 */
    .pricing-card-header {
        display: block !important;
    }

    .pricing-name {
        font-size: 1.5rem !important;
        margin-bottom: 1rem !important;
    }

    .pricing-price {
        font-size: 3.5rem !important;
        margin-bottom: 0.5rem !important;
    }

    .pricing-currency {
        font-size: 2rem !important;
    }

    .pricing-period {
        font-size: 1rem;
        margin-top: 0;
    }

    .pricing-features {
        max-height: none !important;
        opacity: 1 !important;
        margin: 2rem 0 !important;
        padding: 2rem 0 !important;
        border-top: 1px solid rgba(0, 0, 0, 0.1) !important;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1) !important;
    }

    .pricing-feature {
        padding: 0.75rem 0;
        font-size: 1rem;
    }

    .pricing-cta {
        padding: 1rem 2rem !important;
        font-size: 1rem;
    }
}

/* ========================================
   性能优化
   ======================================== */
.pricing-grid {
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

/* 移动设备触摸优化 */
@media (hover: none) and (pointer: coarse) {
    .btn:active {
        transform: scale(0.98);
        transition: transform 0.1s;
    }
}

/* ========================================
   浏览器兼容性
   ======================================== */
@supports not (backdrop-filter: blur(10px)) {
    .navbar,
    .device-card,
    .feature-card,
    .pricing-card {
        background: rgba(255, 255, 255, 0.95);
    }
}


/* ========================================
   移动端价格卡片折叠功能说明
   ======================================== */
/* 
   需要在HTML中添加以下JavaScript代码来实现折叠功能：
   
   1. 在每个 .pricing-card 中添加核心信息摘要
   2. 添加展开/收起按钮
   3. 添加点击事件处理
   
   详见下方JavaScript实现
*/