/* ============================================================
   步天PDM网站现代化样式 - modern.css
   设计理念：高级蓝主色调、层次清晰、动效流畅
   注意：本文件仅新增样式，不覆盖原有布局
   ============================================================ */

/* ---------- 设计系统变量 ---------- */
:root {
    --bt-primary: #0A5BCC;
    --bt-primary-dark: #063D8C;
    --bt-primary-light: #3D8BE0;
    --bt-gradient: linear-gradient(135deg, #063D8C 0%, #0A5BCC 50%, #3D8BE0 100%);
    --bt-gradient-soft: linear-gradient(135deg, #F0F6FF 0%, #E1EEFF 100%);
    --bt-text: #1A2B4A;
    --bt-text-light: #5A6B85;
    --bt-bg-soft: #F7FAFD;
    --bt-border: #E5EDF5;
    --bt-shadow: 0 10px 40px rgba(10, 91, 204, 0.08);
    --bt-shadow-hover: 0 20px 60px rgba(10, 91, 204, 0.15);
    --bt-radius: 16px;
    --bt-radius-sm: 8px;
    --bt-transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   数据统计区
   ============================================================ */
.bt-stats {
    background: var(--bt-gradient);
    padding: 36px 0;
    position: relative;
    overflow: hidden;
}

.bt-stats::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 200, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.bt-stats .container {
    position: relative;
    z-index: 1;
}

.bt-stats .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.bt-stats .stat-item {
    text-align: center;
    color: #fff;
    padding: 6px 10px;
    border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.bt-stats .stat-item:last-child {
    border-right: none;
}

.bt-stats .stat-number {
    font-size: 42px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 6px;
    color: #fff;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

.bt-stats .stat-label {
    font-size: 14px;
    opacity: 0.85;
    letter-spacing: 1px;
}

.bt-stats .stat-desc {
    font-size: 12px;
    opacity: 0.6;
    margin-top: 4px;
}

/* ============================================================
   通用板块标题样式
   ============================================================ */
.bt-section-title {
    text-align: center;
    margin-bottom: 20px;
}

.bt-section-title .bt-title-main {
    font-size: 26px;
    font-weight: 700;
    color: var(--bt-text);
    margin-bottom: 6px;
    letter-spacing: 2px;
}

.bt-section-title .bt-title-sub {
    font-size: 11px;
    color: var(--bt-text-light);
    text-transform: uppercase;
    letter-spacing: 4px;
    font-weight: 500;
}

.bt-section-title .bt-title-line {
    width: 50px;
    height: 3px;
    background: var(--bt-gradient);
    margin: 10px auto 0;
    border-radius: 2px;
}

/* ============================================================
   核心功能详解
   ============================================================ */
.bt-features {
    padding: 40px 0;
    background: var(--bt-bg-soft);
}

.bt-features .features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.bt-features .feature-card {
    background: #fff;
    border-radius: var(--bt-radius);
    padding: 24px 20px;
    box-shadow: var(--bt-shadow);
    transition: var(--bt-transition);
    border: 1px solid var(--bt-border);
    position: relative;
    overflow: hidden;
}

.bt-features .feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--bt-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--bt-transition);
}

.bt-features .feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--bt-shadow-hover);
    border-color: var(--bt-primary-light);
}

.bt-features .feature-card:hover::before {
    transform: scaleX(1);
}

.bt-features .feature-icon {
    width: 48px;
    height: 48px;
    background: var(--bt-gradient-soft);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    transition: var(--bt-transition);
}

.bt-features .feature-card:hover .feature-icon {
    background: var(--bt-gradient);
    transform: rotate(-5deg) scale(1.05);
}

.bt-features .feature-icon i {
    font-size: 26px;
    color: var(--bt-primary);
    transition: var(--bt-transition);
}

.bt-features .feature-card:hover .feature-icon i {
    color: #fff;
}

.bt-features .feature-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--bt-text);
    margin-bottom: 8px;
}

.bt-features .feature-desc {
    font-size: 13px;
    color: var(--bt-text-light);
    line-height: 1.7;
    margin-bottom: 10px;
}

.bt-features .feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.bt-features .feature-tag {
    font-size: 11px;
    padding: 3px 10px;
    background: var(--bt-gradient-soft);
    color: var(--bt-primary);
    border-radius: 10px;
    font-weight: 500;
}

/* ============================================================
   解决方案工作流程
   ============================================================ */
.bt-workflow {
    padding: 36px 0;
    background: #fff;
}

.bt-workflow .workflow-timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
    margin-top: 16px;
}

.bt-workflow .workflow-timeline::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--bt-primary-light) 10%,
        var(--bt-primary) 50%,
        var(--bt-primary-light) 90%,
        transparent 100%);
}

.bt-workflow .workflow-step {
    text-align: center;
    padding: 0 10px;
    position: relative;
}

.bt-workflow .step-number {
    width: 56px;
    height: 56px;
    background: #fff;
    border: 3px solid var(--bt-primary);
    border-radius: 50%;
    margin: 0 auto 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    color: var(--bt-primary);
    position: relative;
    z-index: 2;
    transition: var(--bt-transition);
    box-shadow: 0 4px 20px rgba(10, 91, 204, 0.1);
}

.bt-workflow .workflow-step:hover .step-number {
    background: var(--bt-gradient);
    color: #fff;
    transform: scale(1.08);
    box-shadow: 0 8px 30px rgba(10, 91, 204, 0.3);
}

.bt-workflow .step-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--bt-text);
    margin-bottom: 8px;
}

.bt-workflow .step-desc {
    font-size: 13px;
    color: var(--bt-text-light);
    line-height: 1.6;
}

/* ============================================================
   客户证言
   ============================================================ */
.bt-testimonials {
    padding: 40px 0;
    background: var(--bt-gradient);
    position: relative;
    overflow: hidden;
}

.bt-testimonials::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 10% 90%, rgba(0, 200, 255, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 10%, rgba(255, 255, 255, 0.1) 0%, transparent 40%);
}

.bt-testimonials .container {
    position: relative;
    z-index: 1;
}

.bt-testimonials .bt-section-title .bt-title-main {
    color: #fff;
}

.bt-testimonials .bt-section-title .bt-title-sub {
    color: rgba(255, 255, 255, 0.7);
}

.bt-testimonials .testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.bt-testimonials .testimonial-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--bt-radius);
    padding: 22px;
    transition: var(--bt-transition);
}

.bt-testimonials .testimonial-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

.bt-testimonials .quote-mark {
    font-size: 36px;
    color: rgba(255, 255, 255, 0.3);
    line-height: 1;
    font-family: Georgia, serif;
    margin-bottom: 8px;
}

.bt-testimonials .testimonial-text {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.7;
    margin-bottom: 14px;
}

.bt-testimonials .testimonial-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.bt-testimonials .author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 600;
    font-size: 15px;
}

.bt-testimonials .author-info .author-name {
    font-size: 14px;
    color: #fff;
    font-weight: 600;
}

.bt-testimonials .author-info .author-title {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================================
   常见问题 FAQ
   ============================================================ */
.bt-faq {
    padding: 36px 0;
    background: var(--bt-bg-soft);
}

.bt-faq .container {
    width: 900px;
    margin: 0 auto;
}

.bt-faq .faq-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.bt-faq .faq-item {
    background: #fff;
    border-radius: var(--bt-radius-sm);
    border: 1px solid var(--bt-border);
    overflow: hidden;
    transition: var(--bt-transition);
}

.bt-faq .faq-item:hover {
    border-color: var(--bt-primary-light);
    box-shadow: var(--bt-shadow);
}

.bt-faq .faq-question {
    padding: 16px 22px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 15px;
    font-weight: 600;
    color: var(--bt-text);
    transition: var(--bt-transition);
    user-select: none;
}

.bt-faq .faq-question:hover {
    color: var(--bt-primary);
}

.bt-faq .faq-icon {
    width: 28px;
    height: 28px;
    background: var(--bt-gradient-soft);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bt-primary);
    transition: var(--bt-transition);
    flex-shrink: 0;
    margin-left: 16px;
}

.bt-faq .faq-item.active .faq-icon {
    background: var(--bt-gradient);
    color: #fff;
    transform: rotate(180deg);
}

.bt-faq .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 28px;
    color: var(--bt-text-light);
    font-size: 14px;
    line-height: 1.8;
}

.bt-faq .faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 28px 22px;
}

/* ============================================================
   CTA 行动号召
   ============================================================ */
.bt-cta {
    padding: 36px 0;
    background: var(--bt-gradient);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.bt-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 30% 50%, rgba(0, 200, 255, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

.bt-cta .container {
    position: relative;
    z-index: 1;
}

.bt-cta .cta-title {
    font-size: 30px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.bt-cta .cta-subtitle {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 20px;
    line-height: 1.7;
}

.bt-cta .cta-buttons {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

.bt-cta .cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--bt-transition);
    text-decoration: none;
}

.bt-cta .cta-btn-primary {
    background: #fff;
    color: var(--bt-primary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.bt-cta .cta-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.bt-cta .cta-btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.bt-cta .cta-btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
    transform: translateY(-3px);
}

/* ============================================================
   滚动揭示动画
   ============================================================ */
.bt-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.bt-reveal.bt-visible {
    opacity: 1;
    transform: translateY(0);
}

.bt-reveal-delay-1 { transition-delay: 0.1s; }
.bt-reveal-delay-2 { transition-delay: 0.2s; }
.bt-reveal-delay-3 { transition-delay: 0.3s; }
.bt-reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================================
   响应式适配
   ============================================================ */
@media (max-width: 1200px) {
    .bt-stats .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .bt-stats .stat-item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
        padding-bottom: 24px;
    }

    .bt-features .features-grid,
    .bt-testimonials .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .bt-workflow .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px 20px;
    }

    .bt-workflow .workflow-timeline::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .bt-stats {
        padding: 50px 0;
    }

    .bt-stats .stats-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .bt-stats .stat-number {
        font-size: 38px;
    }

    .bt-features,
    .bt-workflow,
    .bt-testimonials,
    .bt-faq,
    .bt-cta {
        padding: 50px 0;
    }

    .bt-section-title .bt-title-main {
        font-size: 26px;
    }

    .bt-cta .cta-title {
        font-size: 26px;
    }

    .bt-cta .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .bt-cta .cta-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .bt-workflow .workflow-timeline {
        grid-template-columns: 1fr;
    }

    .bt-faq .container {
        width: 100%;
    }
}

/* ============================================================
   产品页面专用样式 - product.html
   ============================================================ */

/* ---------- 产品Hero Banner 增强 ---------- */
.bt-product-hero {
    background: var(--bt-gradient);
    padding: 60px 0 50px;
    position: relative;
    overflow: hidden;
}

.bt-product-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 15% 30%, rgba(255, 255, 255, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 85% 70%, rgba(0, 200, 255, 0.18) 0%, transparent 45%);
}

.bt-product-hero .container {
    position: relative;
    z-index: 1;
}

.bt-product-hero .hero-content {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 40px;
    align-items: center;
}

.bt-product-hero .hero-text {
    color: #fff;
}

.bt-product-hero .hero-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 30px;
    font-size: 13px;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.bt-product-hero .hero-title {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.bt-product-hero .hero-desc {
    font-size: 16px;
    line-height: 1.8;
    opacity: 0.9;
    margin-bottom: 24px;
}

.bt-product-hero .hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 24px;
    margin-bottom: 24px;
}

.bt-product-hero .hero-feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
}

.bt-product-hero .hero-feature-item i {
    color: #7FD8FF;
}

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

.bt-product-hero .hero-visual {
    position: relative;
}

.bt-product-hero .hero-img-wrap {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 30px 80px rgba(0, 40, 100, 0.3);
}

.bt-product-hero .hero-img-wrap img {
    width: 100%;
    border-radius: 12px;
    display: block;
}

/* ---------- 产品整体架构 ---------- */
.bt-product-architecture {
    padding: 50px 0;
    background: #fff;
}

.bt-arch-diagram {
    background: var(--bt-bg-soft);
    border-radius: var(--bt-radius);
    padding: 30px 24px;
    border: 1px solid var(--bt-border);
}

.bt-arch-layer {
    margin-bottom: 16px;
}

.bt-arch-layer:last-child {
    margin-bottom: 0;
}

.bt-arch-layer-title {
    display: inline-block;
    padding: 6px 20px;
    background: var(--bt-gradient);
    color: #fff;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.bt-arch-nodes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
}

.bt-arch-node {
    background: #fff;
    border: 1px solid var(--bt-border);
    border-radius: 12px;
    padding: 18px 14px;
    text-align: center;
    transition: var(--bt-transition);
    cursor: default;
}

.bt-arch-node:hover {
    transform: translateY(-3px);
    border-color: var(--bt-primary-light);
    box-shadow: var(--bt-shadow);
}

.bt-arch-node i {
    font-size: 28px;
    color: var(--bt-primary);
    margin-bottom: 8px;
}

.bt-arch-node span {
    display: block;
    font-size: 13px;
    color: var(--bt-text);
    font-weight: 500;
}

/* ---------- 支持格式/技术特性 ---------- */
.bt-formats {
    padding: 50px 0;
    background: var(--bt-bg-soft);
}

.bt-format-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.bt-format-card {
    background: #fff;
    border-radius: var(--bt-radius);
    padding: 28px 24px;
    border: 1px solid var(--bt-border);
    transition: var(--bt-transition);
}

.bt-format-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--bt-shadow-hover);
    border-color: var(--bt-primary-light);
}

.bt-format-card .format-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--bt-gradient-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
}

.bt-format-card .format-icon i {
    font-size: 24px;
    color: var(--bt-primary);
}

.bt-format-card h3 {
    font-size: 19px;
    font-weight: 600;
    color: var(--bt-text);
    margin-bottom: 14px;
}

.bt-format-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.bt-format-tag {
    padding: 4px 12px;
    background: var(--bt-bg-soft);
    color: var(--bt-text-light);
    border-radius: 6px;
    font-size: 12px;
    font-family: Consolas, Monaco, monospace;
    border: 1px solid var(--bt-border);
}

/* ---------- 产品版本对比 ---------- */
.bt-compare {
    padding: 50px 0;
    background: #fff;
}

.bt-compare-table {
    overflow-x: auto;
    border-radius: var(--bt-radius);
    border: 1px solid var(--bt-border);
}

.bt-compare-table table {
    width: 100%;
    border-collapse: collapse;
    min-width: 768px;
}

.bt-compare-table thead th {
    background: var(--bt-gradient);
    color: #fff;
    padding: 22px 18px;
    font-size: 15px;
    font-weight: 600;
    text-align: center;
    letter-spacing: 1px;
}

.bt-compare-table thead th:first-child {
    text-align: left;
    background: var(--bt-primary-dark);
    min-width: 200px;
}

.bt-compare-table tbody td {
    padding: 16px 18px;
    border-bottom: 1px solid var(--bt-border);
    text-align: center;
    font-size: 14px;
    color: var(--bt-text);
}

.bt-compare-table tbody td:first-child {
    text-align: left;
    background: var(--bt-bg-soft);
    font-weight: 500;
    color: var(--bt-text);
}

.bt-compare-table tbody tr:last-child td {
    border-bottom: none;
}

.bt-compare-table .check {
    color: #10B981;
    font-size: 18px;
    font-weight: 700;
}

.bt-compare-table .cross {
    color: #CBD5E0;
    font-size: 16px;
}

.bt-compare-table .badge {
    display: inline-block;
    padding: 3px 10px;
    background: #FEF3C7;
    color: #92400E;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

.bt-compare-table .badge-blue {
    background: #DBEAFE;
    color: #1E40AF;
}

.bt-compare-table .cta-row td {
    background: var(--bt-bg-soft);
    padding: 22px 18px;
}

.bt-compare-table .cta-row .compare-btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--bt-transition);
}

.bt-compare-table .cta-row .btn-outline {
    border: 2px solid var(--bt-primary-light);
    color: var(--bt-primary);
}

.bt-compare-table .cta-row .btn-outline:hover {
    background: var(--bt-gradient-soft);
}

.bt-compare-table .cta-row .btn-primary {
    background: var(--bt-gradient);
    color: #fff;
    box-shadow: 0 6px 20px rgba(10, 91, 204, 0.25);
}

.bt-compare-table .cta-row .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(10, 91, 204, 0.35);
}

/* ---------- 产品场景 ---------- */
.bt-product-scenes {
    padding: 50px 0;
    background: var(--bt-bg-soft);
}

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

.bt-scene-card {
    background: #fff;
    border-radius: var(--bt-radius);
    overflow: hidden;
    border: 1px solid var(--bt-border);
    transition: var(--bt-transition);
    display: flex;
}

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

.bt-scene-img {
    width: 180px;
    flex-shrink: 0;
    background: var(--bt-gradient-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: var(--bt-primary);
}

.bt-scene-content {
    padding: 20px 22px;
    flex: 1;
}

.bt-scene-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--bt-text);
    margin-bottom: 12px;
}

.bt-scene-content p {
    font-size: 14px;
    color: var(--bt-text-light);
    line-height: 1.8;
    margin-bottom: 16px;
}

.bt-scene-points {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
}

.bt-scene-points span {
    font-size: 13px;
    color: var(--bt-primary);
    display: flex;
    align-items: center;
    gap: 5px;
}

.bt-scene-points span::before {
    content: '✓';
    color: #10B981;
    font-weight: 700;
}

/* ---------- 优势对比 ---------- */
.bt-advantages {
    padding: 50px 0;
    background: #fff;
}

.bt-adv-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.bt-adv-item {
    display: flex;
    gap: 16px;
    padding: 24px;
    border-radius: var(--bt-radius);
    border: 1px solid var(--bt-border);
    transition: var(--bt-transition);
}

.bt-adv-item:hover {
    border-color: var(--bt-primary-light);
    box-shadow: var(--bt-shadow);
}

.bt-adv-num {
    width: 48px;
    height: 48px;
    background: var(--bt-gradient);
    color: #fff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}

.bt-adv-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--bt-text);
    margin-bottom: 8px;
}

.bt-adv-content p {
    font-size: 14px;
    color: var(--bt-text-light);
    line-height: 1.7;
}

/* ---------- 响应式 - 产品页面 ---------- */
@media (max-width: 1200px) {
    .bt-product-hero .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .bt-format-categories {
        grid-template-columns: 1fr;
    }

    .bt-scenes-grid {
        grid-template-columns: 1fr;
    }

    .bt-adv-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .bt-product-hero {
        padding: 60px 0;
    }

    .bt-product-hero .hero-title {
        font-size: 30px;
    }

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

    .bt-product-hero .hero-buttons a {
        width: 100%;
        justify-content: center;
    }

    .bt-product-architecture,
    .bt-formats,
    .bt-compare,
    .bt-product-scenes,
    .bt-advantages {
        padding: 50px 0;
    }

    .bt-arch-diagram {
        padding: 30px 20px;
    }

    .bt-scene-card {
        flex-direction: column;
    }

    .bt-scene-img {
        width: 100%;
        height: 160px;
        font-size: 60px;
    }
}

/* ============================================================
   旧模块现代化覆盖样式 - 痛点/产品模块/页脚
   ============================================================ */

/* ---------- 痛点分析卡片 现代化 ---------- */
.part02-kj {
    background: var(--bt-bg-soft) !important;
    padding: 60px 0 !important;
}

.part02-kj .part02 h3 {
    color: var(--bt-text) !important;
    font-size: 32px !important;
    font-weight: 700 !important;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.part02-kj .neirong {
    color: var(--bt-text-light) !important;
    font-size: 16px !important;
    max-width: 680px;
    margin: 0 auto !important;
    line-height: 1.8 !important;
}

.part02-kj .tongdian {
    width: 100% !important;
    max-width: 1200px;
    height: auto !important;
    margin-top: 30px !important;
}

.part02-kj .tongdian ul {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    float: none !important;
    overflow: visible !important;
}

.part02-kj .tongdian ul li {
    float: none !important;
    width: auto !important;
    height: auto !important;
    margin: 0 !important;
    padding: 80px 28px 28px !important;
    background: #fff !important;
    background-size: 64px !important;
    background-position: center 28px !important;
    border: 1px solid var(--bt-border) !important;
    border-radius: 16px !important;
    box-shadow: 0 4px 20px rgba(10, 91, 204, 0.05);
    transition: all 0.35s ease !important;
    cursor: default;
}

.part02-kj .tongdian ul li:hover {
    transform: translateY(-8px) !important;
    height: auto !important;
    padding-top: 80px !important;
    background-position: center 28px !important;
    box-shadow: 0 16px 40px rgba(10, 91, 204, 0.15) !important;
    border-color: var(--bt-primary-light) !important;
}

.part02-kj .tongdian ul li p.t01 {
    color: var(--bt-text) !important;
    font-size: 19px !important;
    font-weight: 600 !important;
    margin-bottom: 12px !important;
    text-align: center !important;
}

.part02-kj .tongdian ul li p.t02 {
    color: var(--bt-text-light) !important;
    font-size: 14px !important;
    line-height: 1.8 !important;
    text-align: center !important;
}

/* ---------- 4大产品模块 现代化 ---------- */
#business {
    background: #fff !important;
    padding: 0 !important;
    position: relative !important;
    top: 0 !important;
    height: auto !important;
    min-height: auto !important;
    overflow: visible !important;
}

#business .container {
    max-width: 1200px !important;
    padding: 0 24px !important;
    height: auto !important;
    overflow: visible !important;
}

#business .container .panel_wrapper {
    height: auto !important;
    min-height: 420px;
    margin-top: 0 !important;
}

#business .container .panel_wrapper li {
    height: auto !important;
    min-height: 360px;
    width: 260px !important;
}

#business .pagebox {
    margin: 0 !important;
    padding: 30px 0 !important;
}

#business .back_hui {
    background: var(--bt-bg-soft) !important;
}

#business .absolute {
    display: none !important;
}

#business .containerpro {
    max-width: 1120px !important;
    padding: 0 !important;
    margin: 0 auto !important;
    height: auto !important;
    overflow: visible !important;
}

/* 产品模块标题 */
#business .title_cterbox {
    margin-bottom: 30px !important;
    padding-top: 0 !important;
    position: relative;
    text-align: center;
}

#business .title_cterbox .h_t {
    color: var(--bt-text) !important;
    font-size: 30px !important;
    font-weight: 700 !important;
    letter-spacing: 1px;
    display: inline-block;
    position: relative;
    padding-bottom: 18px;
}

#business .title_cterbox .h_t::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 56px;
    height: 4px;
    background: var(--bt-gradient);
    border-radius: 2px;
}

/* 产品模块图文卡片 */
#business .mian_contentbox {
    position: relative;
    display: flex;
    align-items: center;
}

#business .f_mian_contentbox_tbox {
    padding: 30px 0 !important;
}

#business .f_mian_contentbox_tbox p {
    color: var(--bt-text-light) !important;
    font-size: 16px !important;
    line-height: 2 !important;
    margin-top: 0 !important;
    margin-bottom: 20px !important;
}

#business .f_mian_contentbox_tbox h3 {
    color: var(--bt-text) !important;
    font-size: 17px !important;
    font-weight: 600 !important;
    line-height: 2 !important;
    margin-top: 14px !important;
    margin-bottom: 0 !important;
    padding-left: 18px;
    position: relative;
}

#business .f_mian_contentbox_tbox h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    background: var(--bt-primary);
    border-radius: 50%;
}

#business .mian_contentbox_img {
    padding: 0 !important;
    padding-top: 0 !important;
}

#business .mian_contentbox_img img {
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(10, 91, 204, 0.1);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    max-height: 420px;
    object-fit: cover;
    width: 100%;
}

#business .mian_contentbox_img:hover img {
    transform: translateY(-6px);
    box-shadow: 0 20px 50px rgba(10, 91, 204, 0.18);
}

/* 修复产品模块响应式 row 布局 */
#business .row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    margin: 0 !important;
}

#business .row > [class*="col-"] {
    float: none !important;
    margin: 0 !important;
}

#business .pagebox_PD {
    display: flex !important;
    align-items: center;
}

/* ---------- 页脚 现代化 ---------- */
#advantage {
    background: #1a2332 !important;
    padding: 0 !important;
    overflow: hidden !important;
    display: block !important;
    height: auto !important;
    min-height: auto !important;
}

#advantage footer {
    background: #1a2332 !important;
    padding: 30px 0 20px !important;
    color: #B0BAC9 !important;
    overflow: hidden !important;
    height: auto !important;
    min-height: auto !important;
}

#advantage footer .main:first-child {
    display: flex;
    justify-content: center;
    gap: 24px;
    padding: 0 !important;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 16px !important;
}

#advantage footer .main:last-child {
    text-align: center;
    padding: 0 !important;
}

#advantage .footurl {
    float: none !important;
    width: auto !important;
    overflow: visible !important;
}

#advantage .footurl a {
    text-decoration: none;
}

#advantage .footurl h4 {
    color: #fff !important;
    font-size: 15px !important;
    font-weight: 500 !important;
    text-align: center !important;
    margin: 0;
    transition: color 0.3s;
}

#advantage .footurl a:hover h4 {
    color: var(--bt-primary-light) !important;
}

#advantage .adresst {
    float: none !important;
    width: 100% !important;
    text-align: center;
    line-height: 1.8 !important;
    font-size: 14px !important;
    color: #8892A4 !important;
}

#advantage .adresst img {
    vertical-align: middle;
    margin: 0 6px;
}

#advantage .adresst p {
    font-size: 14px !important;
    color: #8892A4 !important;
    line-height: 1.8 !important;
}

/* ---------- 应用场景 现代化 ---------- */
#core_technology {
    background: var(--bt-bg-soft) !important;
    padding: 30px 0 !important;
    height: auto !important;
    min-height: auto !important;
    overflow: visible !important;
}

#core_technology .solution {
    height: auto !important;
    min-height: auto !important;
}

#core_technology .container .panel_wrapper {
    height: auto !important;
    min-height: 350px;
    margin-top: 20px !important;
}

#core_technology .container .panel_wrapper li {
    height: auto !important;
    min-height: 320px;
}

#core_technology .container .panel_wrapper li img {
    height: 100% !important;
    min-height: 200px;
    object-fit: cover;
}

#core_technology .container .panel_wrapper li h3 {
    color: var(--bt-primary) !important;
    font-size: 14px !important;
    letter-spacing: 2px;
    text-transform: uppercase;
}

#core_technology .container .panel_wrapper li h4 {
    color: var(--bt-text) !important;
    font-size: 20px !important;
    font-weight: 700 !important;
    margin: 8px 0 !important;
}

#core_technology .container .panel_wrapper li p span {
    color: var(--bt-text-light) !important;
    font-size: 13px !important;
    line-height: 1.8 !important;
}

#core_technology .container .panel_wrapper li .slbox {
    position: absolute !important;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(6,61,140,0.1) 0%, rgba(6,61,140,0.85) 100%) !important;
    border-radius: 10px;
    transition: all 0.4s ease;
}

#core_technology .container .panel_wrapper li:hover .slbox {
    background: linear-gradient(180deg, rgba(6,61,140,0.3) 0%, rgba(6,61,140,0.95) 100%) !important;
}

/* ---------- 响应式 - 旧模块 ---------- */
@media (max-width: 1200px) {
    .part02-kj .tongdian ul {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .part02-kj {
        padding: 50px 0 !important;
    }

    .part02-kj .part02 h3 {
        font-size: 24px !important;
    }

    .part02-kj .tongdian ul {
        grid-template-columns: 1fr;
    }

    #business .pagebox {
        padding: 50px 0 !important;
    }

    #business .title_cterbox .h_t {
        font-size: 24px !important;
    }

    #advantage footer .main:first-child {
        flex-wrap: wrap;
        gap: 20px 30px;
    }
}