/* ========== 头部导航 ========== */
.site-header {
    background: #87CEEB;
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
    flex-wrap: wrap;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: #fff;
}

.logo span {
    color: #e66c2c;
}

.tagline {
    font-size: 0.7rem;
    opacity: 0.8;
    margin-top: 2px;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 4rem;
}

.nav-menu a {
    font-weight: 500;
    font-size: 1rem;
}

.nav-menu a:hover {
    color: #e66c2c;
}

.language-switch {
    position: relative;
}

.lang-btn {
    background: #2c2e3a;
    border: none;
    color: #fff;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: #fff;
    color: #2c2e3a;
    border-radius: 4px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    display: none;
    min-width: 150px;
    z-index: 100;
}

.lang-dropdown a {
    display: block;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.lang-dropdown a:hover {
    background: #f0f0f0;
}

.language-switch:hover .lang-dropdown {
    display: block;
}

/* 移动端菜单 */
.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 992px) {
    .nav-menu {
        display: none;
        width: 100%;
        order: 3;
        margin-top: 0.8rem;
    }
    .nav-menu.active {
        display: block;
    }
    .nav-menu ul {
        flex-direction: column;
        gap: 0.8rem;
        text-align: center;
    }
    .mobile-menu-toggle {
        display: block;
    }
}

/* ========== Hero 区域 ========== */
.hero {
    background: linear-gradient(rgba(0,0,0,0.2), rgba(0,0,0,0.2)), url('../images/list-bg-03.jpg') center/cover no-repeat;
    min-height: 15vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: #fff;
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}

.hero h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 5rem;
    justify-content: center;
    animation: fadeInUp 1s 0.4s both;
}

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

/* ========== 核心业务卡片 & 全局节间距 ========== */
.section {
    padding: 1.5rem 0;   /* 统一紧凑间距 */
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
}

.section-title:after {
    content: '';
    display: block;
    width: 70px;
    height: 3px;
    background: #e66c2c;
    margin: 0.5rem auto 0;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
    padding: 1.5rem;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 30px rgba(0,0,0,0.1);
}

.card-icon {
    font-size: 2.5rem;
    color: #1e5f8e;
    margin-bottom: 0.8rem;
}

.card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
}

.card p {
    margin-bottom: 1rem;
    color: #555;
}

.card-link {
    color: #e66c2c;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

/* ========== 左右布局（产品页面） ========== */
.products-layout {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

/* 左侧导航卡片样式 */
.products-nav {
    flex: 0 0 240px;
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid #e0e6ed;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    position: sticky;
    top: 100px;
    align-self: start;
    transition: box-shadow 0.2s;
}
.products-nav:hover {
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}
.products-nav h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e66c2c;
    display: inline-block;
}
.products-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.products-nav .nav-group {
    margin-bottom: 1.2rem;
    border-bottom: 1px solid #eef2f5;
    padding-bottom: 0.8rem;
}
.products-nav .nav-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}
.products-nav .nav-group strong {
    display: block;
    font-size: 1rem;
    color: #1e5f8e;
    margin-bottom: 0.5rem;
}
.products-nav .nav-group ul {
    margin-left: 0.5rem;
}
.products-nav .nav-group li {
    margin: 0.5rem 0;
    padding-left: 0.5rem;
    border-left: 2px solid transparent;
    transition: border-left 0.2s;
}
.products-nav .nav-group li:hover {
    border-left-color: #e66c2c;
}
.products-nav .nav-group a {
    color: #4a5568;
    text-decoration: none;
    font-size: 0.9rem;
    display: block;
    transition: color 0.2s, transform 0.1s;
}
.products-nav .nav-group a:hover {
    color: #e66c2c;
    transform: translateX(4px);
}

/* 右侧内容区 */
.products-content {
    flex: 1;
    min-width: 0;
}
.product-detail {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 1.5rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}
.product-detail:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.1);
}
.product-images {
    flex: 0 0 240px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.product-images img {
    width: 100%;
    border-radius: 8px;
    object-fit: cover;
    aspect-ratio: 4/3;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.product-info {
    flex: 1;
}
.product-info h3 {
    font-size: 1.6rem;
    margin-bottom: 0.75rem;
    color: #1e5f8e;
}
.product-info p {
    margin-bottom: 1rem;
    line-height: 1.5;
}
.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: #f9f9f9;
    border-radius: 8px;
    overflow: hidden;
}
.spec-table th, .spec-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}
.spec-table th {
    width: 35%;
    background: #eef2f5;
    font-weight: 600;
    color: #2c3e50;
}
.spec-table td {
    background: #fff;
}
.keywords {
    font-size: 0.85rem;
    color: #e66c2c;
    background: #fff3e6;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    display: inline-block;
    margin-top: 1rem;
}
.keywords strong {
    font-weight: 700;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .products-layout {
        flex-direction: column;
    }
    .products-nav {
        flex: auto;
        position: static;
        margin-bottom: 1.5rem;
    }
    .product-detail {
        flex-direction: column;
    }
    .product-images {
        flex: auto;
        flex-direction: row;
        flex-wrap: wrap;
    }
    .product-images img {
        width: calc(50% - 0.5rem);
    }
}

/* ========== 交替图文 ========== */
.alternate-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: center;
    margin-bottom: 1rem;   /* 减小图文模块间距 */
}

.alternate-row.reverse {
    direction: rtl;
}
.alternate-row.reverse .text-content {
    direction: ltr;
}

.image-content img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.text-content h2 {
    font-size: 1.6rem;
    margin-bottom: 0.8rem;
    color: #1e5f8e;
}

.text-content p {
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .alternate-row, .alternate-row.reverse {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        direction: ltr;
    }
}

/* ========== 优势特点 ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    text-align: center;
}

.feature {
    padding: 1.2rem;
    background: #fff;
    border-radius: 8px;
}

.feature i {
    font-size: 2rem;
    color: #e66c2c;
    margin-bottom: 0.8rem;
}

.feature h3 {
    margin-bottom: 0.5rem;
}

/* ========== 应用场景地图 & 案例 ========== */
.map-section {
    background: #eef2f5;
}
.case-studies {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}
.case-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 10px rgba(0,0,0,0.05);
}
.case-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}
.case-card h4 {
    padding: 0.8rem 1rem 0.3rem;
}
.case-card p {
    padding: 0 1rem 1rem;
}

/* 世界地图容器（图片版） */
.world-map-wrapper {
    width: 100%;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}
.world-map-wrapper img {
    width: 100%;
    height: auto;
    display: block;
}

/* ========== About 摘要 ========== */
.about-summary {
    background: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

/* ========== Footer ========== */
.site-footer {
    background: #1a1c24;
    color: #ccc;
    padding: 3rem 1.5rem 1rem;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}
.footer-col h4 {
    color: #fff;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}
.footer-col p, .footer-col ul {
    margin-bottom: 0.5rem;
}

.footer-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-col ul li {
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.footer-col a {
    color: #ccc;
}
.footer-col a:hover {
    color: #e66c2c;
}
.copyright {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid #333;
    font-size: 0.9rem;
}

/* ========== 全局响应式调整 ========== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .hero-buttons {
        gap: 1rem;
        flex-direction: column;
        align-items: center;
    }
    .section {
        padding: 1rem 0;
    }
    .section-title {
        font-size: 1.6rem;
        margin-bottom: 1rem;
    }
    .cards-grid {
        gap: 1rem;
    }
    .card {
        padding: 1rem;
    }
    .features-grid {
        gap: 1rem;
    }
    .feature {
        padding: 1rem;
    }
    .case-studies {
        gap: 1rem;
    }
    .about-summary {
        padding: 1rem;
    }
    .alternate-row {
        margin-bottom: 1rem;
    }
}