/* 皓航科技 - 子页面样式 · 纯黑白配色 */

/* ===== 页面Banner ===== */
.page-banner {
    margin-top: 72px;
    padding: 120px 24px;
    background: var(--black);
    color: var(--white);
    text-align: center;
}

.banner-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 4px;
}

.banner-content p {
    font-size: 16px;
    color: var(--gray-5);
    letter-spacing: 2px;
    font-weight: 300;
}

/* ===== 子页面区块 ===== */
.subpage-section {
    padding: 120px 0;
}

.subpage-section.alt-bg {
    background: var(--gray-9);
}

/* ===== 区块介绍 ===== */
.section-intro {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.section-intro h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 32px;
    letter-spacing: 2px;
}

.section-intro p {
    font-size: 16px;
    color: var(--gray-4);
    line-height: 2;
}

/* ===== 课程卡片 ===== */
.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 80px;
}

.course-card {
    background: var(--white);
    border: 1px solid var(--gray-7);
    padding: 48px 36px;
    transition: var(--transition);
    position: relative;
}

.course-card:hover {
    border-color: var(--black);
}

.course-card.featured {
    border-color: var(--black);
    background: var(--black);
    color: var(--white);
}

.course-badge {
    position: absolute;
    top: 0;
    right: 36px;
    background: var(--white);
    color: var(--black);
    padding: 8px 20px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
}

.course-header {
    margin-bottom: 32px;
}

.course-header h3 {
    font-size: 24px;
    margin-bottom: 24px;
    font-weight: 600;
    letter-spacing: 1px;
}

.course-price {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-top: 1px solid var(--gray-7);
}

.course-card.featured .course-price {
    border-top-color: var(--gray-3);
}

.price-label {
    color: var(--gray-5);
    font-size: 14px;
    letter-spacing: 1px;
}

.price-value {
    color: var(--black);
    font-size: 18px;
    font-weight: 600;
}

.course-card.featured .price-value {
    color: var(--white);
}

.course-content {
    margin-bottom: 40px;
}

.course-content > p {
    color: var(--gray-4);
    margin-bottom: 24px;
    font-size: 15px;
    line-height: 1.8;
}

.course-card.featured .course-content > p {
    color: var(--gray-5);
}

.course-content ul {
    list-style: none;
}

.course-content li {
    padding: 12px 0;
    color: var(--gray-4);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-8);
    line-height: 1.6;
}

.course-card.featured .course-content li {
    color: var(--gray-5);
    border-bottom-color: var(--gray-3);
}

.course-content li:before {
    content: '—';
    color: var(--gray-6);
    margin-right: 16px;
}

.course-card.featured .course-content li:before {
    color: var(--gray-5);
}

/* ===== 优势网格 ===== */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--gray-7);
    border: 1px solid var(--gray-7);
    margin-top: 80px;
}

.advantage-item {
    padding: 56px 36px;
    background: var(--white);
    text-align: left;
}

.advantage-item h3 {
    font-size: 20px;
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}

.advantage-item p {
    color: var(--gray-4);
    font-size: 15px;
    line-height: 1.8;
}

/* ===== 流程时间线 ===== */
.process-timeline {
    max-width: 900px;
    margin: 80px auto 0;
    position: relative;
}

.process-step {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 56px;
    margin-bottom: 56px;
    padding-bottom: 56px;
    border-bottom: 1px solid var(--gray-7);
    position: relative;
}

.process-step:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.step-number {
    font-size: 56px;
    font-weight: 700;
    color: var(--gray-7);
    line-height: 1;
    letter-spacing: -2px;
}

.step-content {
    padding-top: 12px;
}

.step-content h3 {
    font-size: 22px;
    margin-bottom: 16px;
    font-weight: 600;
    letter-spacing: 1px;
}

.step-content p {
    color: var(--gray-4);
    font-size: 16px;
    line-height: 1.8;
}

/* ===== FAQ列表 ===== */
.faq-list {
    max-width: 800px;
    margin: 80px auto 0;
}

.faq-item {
    padding: 40px 0;
    border-bottom: 1px solid var(--gray-7);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 16px;
    font-weight: 600;
    letter-spacing: 1px;
}

.faq-item p {
    color: var(--gray-4);
    font-size: 16px;
    line-height: 1.8;
}

/* ===== CTA区域 ===== */
.cta-section {
    padding: 120px 0;
    background: var(--black);
    color: var(--white);
    text-align: center;
}

.cta-content h2 {
    font-size: 36px;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.cta-content > p {
    font-size: 16px;
    color: var(--gray-5);
    margin-bottom: 48px;
    letter-spacing: 1px;
}

.cta-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 应用场景卡片 ===== */
.scenario-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--gray-7);
    border: 1px solid var(--gray-7);
    margin-top: 80px;
}

.scenario-card {
    background: var(--white);
    padding: 48px 36px;
}

.scenario-card h3 {
    font-size: 20px;
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}

.scenario-card > p {
    color: var(--gray-4);
    margin-bottom: 24px;
    font-size: 15px;
    line-height: 1.8;
}

.scenario-card ul {
    list-style: none;
}

.scenario-card li {
    padding: 10px 0;
    color: var(--gray-4);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-8);
}

.scenario-card li:last-child {
    border-bottom: none;
}

.scenario-card li:before {
    content: '—';
    color: var(--gray-6);
    margin-right: 16px;
}

/* ===== 设备参数卡片 ===== */
.specs-container {
    max-width: 1000px;
    margin: 80px auto 0;
}

.specs-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    background: var(--white);
    border: 1px solid var(--gray-7);
    padding: 56px;
}

.specs-image img {
    width: 100%;
    height: auto;
    display: block;
}

.specs-content h3 {
    font-size: 32px;
    margin-bottom: 40px;
    font-weight: 700;
    letter-spacing: 2px;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 40px;
}

.spec-item {
    padding: 24px 0;
    border-bottom: 1px solid var(--gray-7);
}

.spec-label {
    display: block;
    color: var(--gray-5);
    font-size: 13px;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.spec-value {
    display: block;
    color: var(--black);
    font-size: 28px;
    font-weight: 700;
}

.specs-features h4 {
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}

.specs-features ul {
    list-style: none;
}

.specs-features li {
    padding: 12px 0;
    color: var(--gray-4);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-8);
    line-height: 1.6;
}

.specs-features li:before {
    content: '—';
    color: var(--gray-6);
    margin-right: 16px;
}

/* ===== 价格说明 ===== */
.pricing-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--gray-7);
    border: 1px solid var(--gray-7);
    margin-top: 80px;
}

.pricing-card {
    background: var(--white);
    padding: 48px 36px;
}

.pricing-card.featured {
    background: var(--black);
    color: var(--white);
}

.pricing-card h3 {
    font-size: 22px;
    margin-bottom: 28px;
    font-weight: 600;
    letter-spacing: 1px;
}

.pricing-card > p {
    color: var(--gray-4);
    margin-bottom: 24px;
    font-size: 15px;
    line-height: 1.8;
}

.pricing-card.featured > p {
    color: var(--gray-5);
}

.pricing-card ul {
    list-style: none;
}

.pricing-card li {
    padding: 12px 0;
    color: var(--gray-4);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-8);
    line-height: 1.6;
}

.pricing-card.featured li {
    color: var(--gray-5);
    border-bottom-color: var(--gray-3);
}

.price-range {
    margin: 32px 0;
}

.price-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--gray-3);
}

.price-item .price-label {
    color: var(--gray-5);
    font-size: 15px;
}

.price-item .price-value {
    color: var(--white);
    font-size: 18px;
    font-weight: 600;
}

.price-item .price-note {
    color: var(--gray-5);
    font-size: 14px;
}

.pricing-note {
    font-size: 14px;
    color: var(--gray-5);
    margin-top: 24px;
    line-height: 1.6;
}

/* ===== 产品详情卡片 ===== */
.product-detail-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 80px;
}

.product-detail-card {
    background: var(--white);
    border: 1px solid var(--gray-7);
    overflow: hidden;
    transition: var(--transition);
}

.product-detail-card:hover {
    border-color: var(--black);
}

.pdc-image {
    height: 280px;
    overflow: hidden;
    background: var(--gray-9);
}

.pdc-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-detail-card:hover .pdc-image img {
    transform: scale(1.03);
}

.pdc-content {
    padding: 40px 36px;
}

.pdc-content h3 {
    font-size: 24px;
    margin-bottom: 10px;
    font-weight: 600;
    letter-spacing: 1px;
}

.pdc-tagline {
    color: var(--gray-5);
    font-size: 15px;
    margin-bottom: 28px;
    letter-spacing: 1px;
}

.pdc-specs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 28px;
    padding: 28px 0;
    border-top: 1px solid var(--gray-7);
    border-bottom: 1px solid var(--gray-7);
}

.pdc-spec {
    text-align: center;
}

.pdc-spec span {
    display: block;
    color: var(--gray-5);
    font-size: 13px;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.pdc-spec strong {
    display: block;
    color: var(--black);
    font-size: 22px;
    font-weight: 700;
}

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

.pdc-features li {
    padding: 10px 0;
    color: var(--gray-4);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-8);
    line-height: 1.6;
}

.pdc-features li:before {
    content: '—';
    color: var(--gray-6);
    margin-right: 16px;
}

.pdc-price {
    color: var(--black);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

/* ===== 配件网格 ===== */
.accessories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--gray-7);
    border: 1px solid var(--gray-7);
    margin-top: 80px;
}

.accessory-card {
    padding: 48px 36px;
    background: var(--white);
    text-align: left;
}

.accessory-card h4 {
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 600;
    letter-spacing: 1px;
}

.accessory-card p {
    color: var(--gray-4);
    font-size: 15px;
    line-height: 1.6;
}

/* ===== 维修服务详情卡片 ===== */
.service-detail-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--gray-7);
    border: 1px solid var(--gray-7);
    margin-top: 80px;
}

.service-detail-card {
    background: var(--white);
    padding: 48px 36px;
}

.service-detail-card h3 {
    font-size: 20px;
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}

.service-detail-card > p {
    color: var(--gray-4);
    margin-bottom: 24px;
    font-size: 15px;
    line-height: 1.8;
}

.service-detail-card ul {
    list-style: none;
}

.service-detail-card li {
    padding: 10px 0;
    color: var(--gray-4);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-8);
}

.service-detail-card li:last-child {
    border-bottom: none;
}

.service-detail-card li:before {
    content: '—';
    color: var(--gray-6);
    margin-right: 16px;
}

/* ===== 保养计划卡片 ===== */
.maintenance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 80px;
}

.maintenance-card {
    background: var(--white);
    border: 1px solid var(--gray-7);
    padding: 48px 36px;
    transition: var(--transition);
}

.maintenance-card:hover {
    border-color: var(--black);
}

.maintenance-card.featured {
    border-color: var(--black);
    background: var(--black);
    color: var(--white);
}

.maintenance-card h3 {
    font-size: 22px;
    margin-bottom: 16px;
    font-weight: 600;
    letter-spacing: 1px;
}

.maintenance-frequency {
    color: var(--gray-5);
    font-size: 14px;
    margin-bottom: 28px;
    letter-spacing: 1px;
}

.maintenance-card.featured .maintenance-frequency {
    color: var(--gray-5);
}

.maintenance-card ul {
    list-style: none;
}

.maintenance-card li {
    padding: 12px 0;
    color: var(--gray-4);
    font-size: 15px;
    border-bottom: 1px solid var(--gray-8);
    line-height: 1.6;
}

.maintenance-card.featured li {
    color: var(--gray-5);
    border-bottom-color: var(--gray-3);
}

.maintenance-card li:last-child {
    border-bottom: none;
}

.maintenance-card li:before {
    content: '—';
    color: var(--gray-6);
    margin-right: 16px;
}

.maintenance-card.featured li:before {
    color: var(--gray-5);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .page-banner { padding: 96px 24px; }
    .banner-content h1 { font-size: 40px; }
    
    .subpage-section { padding: 96px 0; }
    .cta-section { padding: 96px 0; }
    
    .section-intro h2 { font-size: 32px; }
    .section-header h2 { font-size: 32px; }
    
    .course-grid,
    .advantage-grid,
    .scenario-grid,
    .pricing-info,
    .product-detail-grid,
    .accessories-grid,
    .service-detail-grid,
    .maintenance-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .specs-card {
        grid-template-columns: 1fr;
        gap: 48px;
        padding: 48px;
    }
}

@media (max-width: 768px) {
    .page-banner {
        padding: 72px 24px;
    }

    .banner-content h1 {
        font-size: 32px;
    }

    .subpage-section {
        padding: 72px 0;
    }
    
    .cta-section {
        padding: 72px 0;
    }

    .section-intro h2,
    .cta-content h2 {
        font-size: 28px;
    }

    .course-grid,
    .advantage-grid,
    .scenario-grid,
    .pricing-info,
    .product-detail-grid,
    .accessories-grid,
    .service-detail-grid,
    .maintenance-grid {
        grid-template-columns: 1fr;
    }

    .process-step {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .step-number {
        font-size: 42px;
    }

    .cta-btns {
        flex-direction: column;
    }
    
    .specs-card {
        padding: 36px 28px;
    }
    
    .specs-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}