* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #1f2937;
    background-color: #f4f4f4;
}

a {
    text-decoration: none;
}

.shell {
    max-width: 1200px;
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
}

.site-header .shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 12px 8px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 36px;
    font-weight: 700;
    color: #0f3d8a;
}

.brand img {
    width: 84px;
    height: 84px;
    object-fit: contain;
}

.top-nav {
    display: flex;
    align-items: center;
    gap: 26px;
}

.top-nav a {
    color: #111827;
    font-weight: 500;
}

.top-nav a:hover {
    color: #0f3d8a;
}

.lang-switch {
    border: 1px solid #0f3d8a;
    color: #0f3d8a;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 6px;
}

.hero-banner {
    min-height: 560px;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    display: flex;
    align-items: center;
}

.hero-inner {
    color: #ffffff;
    text-align: center;
    padding: 48px 12px;
}

.hero-inner h1 {
    margin: 0;
    font-size: 56px;
    line-height: 1.15;
    font-weight: 800;
}

.hero-inner p {
    margin: 22px 0 0;
    font-size: 22px;
}

.hero-btn {
    margin-top: 26px;
    display: inline-block;
    background: #0f63e9;
    color: #ffffff;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 700;
}

.section-block {
    padding: 72px 0;
}

.section-title {
    margin: 0 0 34px;
    font-size: 38px;
    color: #0f172a;
    text-align: center;
}

.about-block {
    padding-top: 68px;
    padding-bottom: 56px;
    background: #ffffff;
}

.about-panel {
    max-width: 980px;
    margin: 0 auto;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 30px 34px;
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.06);
}

.about-panel p {
    margin: 0;
    font-size: 18px;
    line-height: 1.9;
    color: #374151;
}

.about-panel ul {
    margin: 24px 0 0;
    padding-left: 0;
    list-style: none;
    color: #1f2937;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 22px;
}

.about-panel li::before {
    content: "●";
    color: #0f63e9;
    margin-right: 8px;
}

.services-block {
    background: #fbfbfb;
    padding-top: 64px;
    padding-bottom: 64px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
}

.service-card {
    background: #ffffff;
    border-radius: 10px;
    border: 1px solid #ebedf0;
    text-align: center;
    padding: 36px 22px 30px;
    box-shadow: 0 3px 12px rgba(16, 24, 40, 0.05);
}

.service-card i {
    font-size: 50px;
    color: #0f63e9;
}

.service-card h3 {
    margin: 20px 0 12px;
    font-size: 30px;
    font-weight: 800;
    line-height: 1.2;
}

.service-card p {
    margin: 0;
    color: #374151;
    font-size: 24px;
    line-height: 1.5;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
}

.product-card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.08);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    height: 100%;
}

.product-link {
    display: block;
    color: inherit;
}

.product-link:hover {
    transform: translateY(-6px);
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.14);
}

.product-card img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    display: block;
}

.product-content {
    padding: 18px;
}

.product-content h3 {
    margin: 0;
    font-size: 22px;
}

.product-content p {
    margin: 10px 0 14px;
    color: #4b5563;
    min-height: 56px;
    line-height: 1.7;
}

.product-content span {
    color: #0f63e9;
    font-weight: 700;
}

.contact-block {
    background: #f9f9f9;
}

.contact-layout {
    display: grid;
    gap: 24px;
    grid-template-columns: 1fr 1fr;
}

.contact-list {
    background: #ffffff;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    padding: 28px;
}

.contact-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 24px;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-item i {
    font-size: 24px;
    color: #0f63e9;
    width: 30px;
}

.contact-item h4 {
    margin: 0 0 5px;
    font-size: 22px;
}

.contact-item p {
    margin: 0;
    color: #4b5563;
}

.map-box {
    background: #ffffff;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    overflow: hidden;
    min-height: 420px;
}

.map-box iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

.detail-layout {
    display: grid;
    gap: 34px;
    grid-template-columns: 1fr 1fr;
}

.detail-image img {
    width: 100%;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.08);
}

.detail-content h1 {
    margin: 0 0 18px;
    font-size: 44px;
}

.detail-content h3 {
    margin: 24px 0 10px;
    font-size: 24px;
    color: #111827;
}

.detail-content p {
    margin: 0;
    font-size: 18px;
    color: #4b5563;
    line-height: 1.75;
}

.spec-box {
    margin-top: 12px;
    padding: 14px 16px;
    border-radius: 8px;
    background: #f1f5f9;
    border: 1px solid #dbe3ed;
    font-size: 17px;
}

.detail-actions {
    margin-top: 28px;
    display: flex;
    gap: 14px;
}

.ghost-btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    border: 1px solid #0f63e9;
    color: #0f63e9;
    font-weight: 700;
}

.site-footer {
    background: #111827;
    color: #d1d5db;
    margin-top: 40px;
}

.footer-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 22px 8px;
}

.footer-shell p {
    margin: 0;
}

.footer-shell a {
    color: #93c5fd;
}

@media (max-width: 992px) {
    .services-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .contact-layout,
    .detail-layout {
        grid-template-columns: 1fr;
    }

    .hero-inner h1 {
        font-size: 40px;
    }

    .hero-inner p {
        font-size: 18px;
    }
}

@media (max-width: 640px) {
    .site-header .shell {
        flex-wrap: wrap;
        justify-content: center;
    }

    .brand {
        width: 100%;
        justify-content: center;
    }

    .top-nav {
        width: 100%;
        justify-content: center;
        gap: 14px;
    }

    .section-title {
        font-size: 30px;
    }

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

    .about-panel {
        padding: 22px 20px;
    }

    .detail-content h1 {
        font-size: 34px;
    }

    .detail-actions {
        flex-direction: column;
        align-items: stretch;
    }
}