* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

body {
    color: #333;
    background: #fff;
    line-height: 1.7;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* 导航 */
header {
    background: #1f2d3d;
    padding: 0%;
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.nav {
    max-width: 90%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo-box {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 80px;
}

.logo-img {
    height: 65px;
    width: auto;
    display: block;
    padding: 10px 25px 10px 25px;
}

.logo-text {
    color: #fff;
    font-size: 40px;
    font-weight: 600;
    white-space: nowrap;
    margin-left: 10px;
}

.nav-menu {
    display: flex;
    gap: 28px;
}

.nav-menu a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
    white-space: nowrap;
}

.nav-menu a:hover {
    color: #f39e0c;
}

.nav-menu .active {
    color: #f39e0c;
    font-weight: 700;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-select {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
    padding: 8px 18px 8px 12px;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 6px center;
    background-size: 16px;
    min-width: 90px;
}

.language-select:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: var(--nkm-orange);
}

.language-select option {
    background: var(--nkm-blue);
    color: #fff;
    padding: 8px;
}

/* 首屏Banner */
.banner {
    height: 480px;
    background: linear-gradient(rgba(31, 45, 61, 0.75), rgba(31, 45, 61, 0.75)),
        url(https://picsum.photos/id/1019/1920/800) center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

.banner h1 {
    font-size: 44px;
    margin-bottom: 18px;
}

.banner p {
    font-size: 20px;
    margin-bottom: 35px;
    opacity: 0.9;
}

.btn {
    padding: 13px 35px;
    background: #409eff;
    border-radius: 4px;
    color: #fff;
    font-size: 16px;
    transition: 0.3s;
}

.btn:hover {
    background: #2b7cd3;
}

/* 通用区块 */
.container {
    max-width: 80%;
    margin: 0 auto;
    padding: 70px 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 32px;
    color: #1f2d3d;
    margin-bottom: 12px;
}

.section-title p {
    color: #666;
    font-size: 16px;
}

/* 产品导航栏 - 与首页样式一致 */
.product-title-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 120px;
    margin-bottom: 30px;
    justify-items: center;
}

.title-item {
    text-align: center;
    font-size: 25px;
    font-weight: bold;
    color: #1f2d3d;
    position: relative;
    padding-bottom: 8px;
    width: 100%;
}

.title-item::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: #f39e0c;
}

/* 四大粉体设备模块 - 一行四列 */
.equip-box {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 120px;
    justify-items: center;
}

.equip-card {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 3px 15px #eee;
    transition: 0.3s;
}

.equip-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px #ddd;
}

.equip-card h3 {
    font-size: 20px;
    color: #1f2d3d;
    margin-bottom: 16px;
    border-left: 4px solid #409eff;
    padding-left: 12px;
}

.equip-card .desc {
    color: #555;
    margin-bottom: 12px;
    font-size: 14px;
    line-height: 1.6;
}

.equip-card ul li {
    padding: 4px 0;
    color: #555;
    position: relative;
    padding-left: 20px;
    font-size: 14px;
    line-height: 1.6;
}

.equip-card ul li::before {
    content: "▪";
    color: #409eff;
    position: absolute;
    left: 0;
}

.equip-card .equip-img {
    width: 100%;
    height: 280px;
    overflow: hidden;
    margin-bottom: 15px;
    border-radius: 6px;
}

.equip-card .equip-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

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

.equip-card .equip-link {
    display: inline-block;
    margin-top: 15px;
    color: #409eff;
    font-size: 14px;
    text-decoration: none;
    transition: color 0.3s;
}

.equip-card .equip-link:hover {
    color: #2b7cd3;
}

/* 应用行业 */
.industry {
    background: #f5f7fa;
}

.industry-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}

.industry-item {
    padding: 25px 15px;
    background: #fff;
    border-radius: 6px;
}

.industry-item h4 {
    color: #1f2d3d;
    margin-top: 10px;
}

.industry-item p {
    font-size: 13px;
    color: #666;
    margin-top: 8px;
}

.industry-icon {
    font-size: 36px;
    margin-bottom: 10px;
}

/* 企业优势 */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-item {
    text-align: center;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: transform 0.3s;
}

.advantage-item:hover {
    transform: translateY(-5px);
}

.advantage-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.advantage-item h3 {
    font-size: 18px;
    color: #1f2d3d;
    margin-bottom: 10px;
}

.advantage-item p {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

/* 底部信息 */
.footer-top {
    background: #1f2d3d;
    color: #fff;
}

.footer-row {
    max-width: 1400px;
    margin: 0 auto;
    padding: 50px 5%;
    display: flex;
    flex-wrap: wrap;
    gap: 50px;
}

.footer-col {
    flex: 1;
    min-width: 260px;
}

.footer-col h4 {
    font-size: 20px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f39e0c;
    display: inline-block;
}

.footer-col p {
    margin-bottom: 10px;
    line-height: 1.7;
}

.footer-col a {
    color: #fff;
    text-decoration: none;
}

.footer-col a:hover {
    color: #f39e0c;
}

footer {
    background: #1f2d3d;
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
    padding: 20px 5%;
    font-size: 14px;
}

/* 移动端适配 */
@media(max-width:1024px) {
    .equip-box {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
    .product-title-row {
        gap: 30px;
    }
}

@media(max-width:768px) {
    .nav {
        flex-direction: column;
        padding: 10px 0;
        height: auto;
    }
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
        margin-top: 10px;
    }
    .nav-menu a {
        font-size: 14px;
    }
    .logo-img {
        height: 55px;
        padding: 10px 15px;
    }
    .banner h1 {
        font-size: 28px;
    }
    .banner {
        height: 320px;
    }
    .equip-box {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .product-title-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    .title-item {
        font-size: 18px;
    }
    .industry-list {
        grid-template-columns: repeat(2, 1fr);
    }
    .container {
        padding: 50px 15px;
    }
    .footer-row {
        flex-direction: column;
        gap: 30px;
    }
}

@media(max-width:480px) {
    .nav-menu {
        gap: 10px;
    }
    .nav-menu a {
        font-size: 13px;
    }
    .banner h1 {
        font-size: 24px;
    }
    .banner p {
        font-size: 14px;
    }
    .product-title-row {
        grid-template-columns: 1fr;
    }
    .industry-list {
        grid-template-columns: 1fr;
    }
    .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}