/* ========== 核心产品与技术 ========== */
.product {
    padding: 120px 0 80px;
    background: #f8fafc;
}
.product .section-title {
    text-align: center;
    margin-bottom: 48px;
}
.product .section-title h2 {
    font-size: 32px;
    color: #1a1a2e;
    margin-bottom: 16px;
}
.product .section-title p {
    font-size: 16px;
    color: #666;
}
.product-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}
.product-tab {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
}
.tab-btn {
    padding: 10px 28px;
    border: 1px solid #ddd;
    border-radius: 24px;
    background: #fff;
    color: #555;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s;
}
.tab-btn.active {
    background: #3FCAC0;
    color: #fff;
    border-color: #3FCAC0;
}
.tab-btn:hover:not(.active) {
    border-color: #3FCAC0;
    color: #3FCAC0;
}
.product-content {
    position: relative;
}
.product-tab-content {
    display: block;
}
.product-main {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    margin-bottom: 32px;
}
.product-main-header {
    display: flex;
    align-items: stretch;
}
.product-main-img {
    width: 50%;
    min-height: 350px;
    height: 350px;
    overflow: hidden;
}
.product-main-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.product-main-info {
    width: 50%;
    padding: 48px 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.product-main-info h3 {
    font-size: 24px;
    color: #1a1a2e;
    margin-bottom: 24px;
}
.product-main-info ul {
    list-style: none;
    margin-bottom: 28px;
}
.product-main-info ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 12px;
    font-size: 15px;
    color: #555;
}
.product-main-info ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #3FCAC0;
}
.product-main-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.product-main-tags span {
    padding: 8px 20px;
    background: #3FCAC0;
    color: #fff;
    border-radius: 20px;
    font-size: 14px;
}
.product-cards {
    display: flex;
    gap: 24px;
}
.product-card-new {
    flex: 1;
    background: #fff;
    border-radius: 12px;
    padding: 32px 28px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    transition: transform 0.3s, box-shadow 0.3s;
}
.product-card-new:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}
.product-card-new h4 {
    font-size: 20px;
    color: #1a1a2e;
    margin-bottom: 8px;
}
.product-card-new .subtitle {
    font-size: 20px;
    color: #1a1a2e;
    margin-bottom: 8px;
    font-weight: 700;
}
.product-card-new ul {
    list-style: none;
    margin-bottom: 0;
}
.product-card-new ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    font-size: 14px;
    color: #555;
}
.product-card-new ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 7px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #3FCAC0;
}
.product-card-new .link {
    color: #3FCAC0;
    font-size: 14px;
    cursor: pointer;
    transition: opacity 0.3s;
}
.product-card-new .link:hover {
    opacity: 0.7;
}

:root {
    --main-color: #3FCAC0;
    --dark-color: #1a1a2e;
    --light-gray: #f5f7fa;
    --dark-gray: #333;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', 'Arial', sans-serif;
}
body {
    background-color: #fff;
    color: var(--dark-gray);
    line-height: 1.6;
    overflow-x: hidden;
}

/* cursor: Banner 全宽展示，避免 100vw/1920px 引发横向滚动 */
.tech-banner {
    position: relative;
    width: 100%;
    height: 1000px;
    overflow: hidden;
}
.tech-banner-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* cursor: Banner 文字标题，样式复用自 about.css 的 banner-title/subtitle */
.product-banner-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    padding-top: 350px;
    z-index: 1;
}

.product-banner-title {
    font-size: 72px;
    font-weight: bold;
    color: #fff;
    margin: 0 0 24px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    opacity: 0;
    animation: productBannerFadeInUp 0.8s ease-out forwards;
    animation-delay: 0.5s;
}

.product-banner-title sup {
    font-size: 0.5em;
    vertical-align: super;
    margin-left: 4px;
}

.product-banner-subtitle {
    font-size: 36px;
    color: #fff;
    margin: 0 0 16px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    opacity: 0;
    animation: productBannerFadeInUp 0.8s ease-out forwards;
    animation-delay: 0.8s;
}

@keyframes productBannerFadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 核心优势 */
.advantage {
    padding: 80px 0;
    background-image: url('/assets/pro-1.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}
.section-title {
    text-align: center;
    margin-bottom: 60px;
}
.section-title h2 {
    font-size: 32px;
    font-weight: bold;
    color: #1a1a1a;
    margin-bottom: 15px;
}
.section-title p {
    font-size: 16px;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}
.advantage-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}
.advantage-card {
    background-color: #f9fbff;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}
.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
}
.advantage-icon {
    font-size: 40px;
    color: #0066cc;
    margin-bottom: 20px;
}
.advantage-icon img {
    width: 70px;
    height: 70px;
    object-fit: contain;
}
.advantage-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1a1a1a;
}
.advantage-card p {
    font-size: 14px;
    color: #666;
    line-height: 1.5;
}

@media (max-width: 1200px) {
    .footer-container, .footer-bottom {
        width: 90%;
    }
}

/* AIoT智能物联详细展示板块 */
.aiot-detail-section {
    padding: 60px 0;
    background: #f5f7fa;
}
/* AI+中台变体：padding 与背景略不同 */
.aiot-detail-section--aiplus {
    padding: 80px 0;
    background: #f8fafc;
}
/* AI+中台主卡片：复用 .product-main-img / .product-main-info / .product-main-tags 子结构 */
.aiot-detail-top {
    display: flex;
    align-items: stretch;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    margin-bottom: 40px;
}
.aiot-detail-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.aiot-detail-main {
    display: flex;
    gap: 40px;
    align-items: center;
    margin-bottom: 50px;
}
.aiot-detail-left {
    flex: 1;
    min-height: 350px;
    border-radius: 8px;
    overflow: hidden;
}
.aiot-detail-left img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.aiot-detail-right {
    flex: 1;
}
.aiot-detail-right h3 {
    font-size: 24px;
    font-weight: 700;
    color: #1F2937;
    margin-bottom: 20px;
}
.aiot-detail-features {
    list-style: none;
    padding: 0;
    margin-bottom: 24px;
}
.aiot-detail-features li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 12px;
    font-size: 15px;
    color: #374151;
    line-height: 1.6;
}
.aiot-detail-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #3FCAC0;
}
.aiot-detail-btns {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.aiot-tag-btn {
    padding: 10px 24px;
    background: #3FCAC0;
    color: #fff;
    border: none;
    border-radius: 24px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.3s;
}
.aiot-tag-btn:hover {
    background: #32b3a9;
}
.aiot-detail-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.aiot-detail-card {
    background: #fff;
    border-radius: 12px;
    padding: 30px 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.3s, box-shadow 0.3s;
}
.aiot-detail-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.aiot-detail-card h4 {
    font-size: 20px;
    font-weight: 700;
    color: #1F2937;
    margin-bottom: 6px;
}
.aiot-card-subtitle {
    font-size: 13px;
    color: #9ca3af;
    margin-bottom: 16px;
}
.aiot-card-features {
    list-style: none;
    padding: 0;
    margin-bottom: 0;
}
.aiot-card-features li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 0px;
    font-size: 14px;
    color: #374151;
    line-height: 1.6;
}
.aiot-card-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #3FCAC0;
}
.aiot-card-link {
    color: #3FCAC0;
    font-size: 14px;
    cursor: pointer;
    transition: color 0.3s;
}
.aiot-card-link:hover {
    color: #32b3a9;
}