/* ============================================
   产品中心二级页面专属样式 — 动态面板版
   ============================================ */

/* ---- 页面标题区 ---- */
.page-hero {
    position: relative;
    padding: 160px 0 100px;
    background: var(--dark);
    overflow: hidden;
    text-align: center;
}

.page-hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient);
    opacity: 0.15;
}

.page-hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(0,102,255,0.1) 0%, transparent 70%);
}

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

.page-hero-title {
    font-size: 48px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.page-hero-desc {
    font-size: 18px;
    color: rgba(255,255,255,0.7);
    max-width: 560px;
    margin: 0 auto;
}

/* ---- 产品分类 Tab 导航 ---- */
.product-tabs-nav {
    position: sticky;
    top: 72px;
    z-index: 100;
    background: var(--white);
    border-bottom: 1px solid var(--gray-light);
    padding: 0;
}

.product-tabs-list {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 16px 0;
    flex-wrap: wrap;
}

.product-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--dark);
    border-radius: 50px;
    background: var(--bg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    font-family: inherit;
}

.product-tab:hover {
    background: rgba(0,102,255,0.08);
    color: var(--primary);
}

.product-tab.active {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(0,102,255,0.3);
    border-color: transparent;
}

.product-tab i {
    font-size: 16px;
    color: var(--primary);
    transition: var(--transition);
}

.product-tab.active i {
    color: var(--white);
}

/* ---- 动态面板容器 ---- */
.product-panels {
    min-height: 400px;
    background: var(--bg);
}

.product-panel {
    display: none;
    padding: 80px 0;
    animation: panelFadeIn 0.4s ease;
}

.product-panel.active {
    display: block;
}

@keyframes panelFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---- 面板头部 ---- */
.panel-header {
    text-align: center;
    margin-bottom: 60px;
}

.panel-header .product-category {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.panel-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--dark);
}

.panel-desc {
    font-size: 17px;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ---- 设备卡片网格 ---- */
.device-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

/* 单个产品居中 */
.device-grid.single-device {
    display: flex;
    justify-content: center;
}

.device-grid.single-device .device-card {
    max-width: 420px;
    width: 100%;
}

.device-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.device-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.device-img {
    height: 220px;
    overflow: hidden;
    position: relative;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.device-card:hover .device-img img {
    transform: scale(1.05);
}

.device-info {
    padding: 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.device-model {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--primary);
    background: rgba(0,102,255,0.08);
    padding: 4px 12px;
    border-radius: 50px;
    margin-bottom: 10px;
    align-self: flex-start;
}

.device-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark);
}

.device-info > p {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: 16px;
}

.device-specs {
    margin-bottom: 20px;
    flex: 1;
}

.device-specs li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    font-size: 13px;
    color: var(--dark);
}

.device-specs li i {
    color: var(--secondary);
    font-size: 14px;
    width: 18px;
    text-align: center;
    flex-shrink: 0;
}

/* ---- CTA 区域 ---- */
.product-cta {
    padding: 100px 0;
    background: var(--gradient);
    text-align: center;
    color: var(--white);
}

.product-cta-content h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.product-cta-content p {
    font-size: 17px;
    opacity: 0.9;
    margin-bottom: 36px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.product-cta-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.product-cta-actions .btn-primary {
    background: var(--white);
    color: var(--primary);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.product-cta-actions .btn-primary:hover {
    background: var(--white);
    color: var(--primary-dark);
    box-shadow: 0 6px 24px rgba(0,0,0,0.2);
}

.product-cta-actions .btn-outline {
    border-color: rgba(255,255,255,0.5);
}

.product-cta-actions .btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
}

/* ---- 按钮变体 ---- */
.btn-outline-dark {
    background: transparent;
    color: var(--dark);
    border: 2px solid var(--gray-light);
}

.btn-outline-dark:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(0,102,255,0.05);
}

.btn-lg {
    padding: 16px 44px;
    font-size: 16px;
}

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

@media (max-width: 768px) {
    .page-hero {
        padding: 120px 0 60px;
    }

    .page-hero-title {
        font-size: 32px;
    }

    .product-tabs-list {
        gap: 6px;
        padding: 12px 0;
    }

    .product-tab {
        padding: 10px 16px;
        font-size: 13px;
    }

    .product-panel {
        padding: 50px 0;
    }

    .panel-header h2 {
        font-size: 28px;
    }

    .panel-desc {
        font-size: 15px;
    }

    .device-grid {
        grid-template-columns: 1fr;
    }

    .device-img {
        height: 260px;
    }

    .product-cta-content h2 {
        font-size: 28px;
    }

    .product-cta-actions {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .page-hero-title {
        font-size: 26px;
    }

    .product-tab {
        padding: 8px 14px;
        font-size: 12px;
    }

    .product-tab i {
        font-size: 14px;
    }

    .panel-header h2 {
        font-size: 24px;
    }
}