* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: 'Arial', Helvetica, sans-serif;
    color: #333333;
    background-color: #f4f7fa;
    line-height: 1.7;
}
a {
    text-decoration: none;
}

/* Header */
header {
    background-color: #0F4C81;
    color: #ffffff;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top:0;
    z-index: 999;
    box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}
.logo {
    font-size: 1.6rem;
    font-weight: 700;
}
.nav-desktop {
    display: flex;
    gap: 2rem;
}
.nav-desktop a {
    color:#fff;
    font-size:1rem;
    transition: color 0.25s ease;
}
.nav-desktop a:hover {
    color:#82c0ff;
}
.nav-desktop a.active {
    color:#82c0ff;
}
.menu-toggle {
    display: none;
    font-size:1.8rem;
    cursor:pointer;
}
.nav-mobile {
    display:none;
    position:absolute;
    top:100%;
    left:0;
    width:100%;
    background:#0b3a66;
    padding:1rem 5%;
    flex-direction:column;
    gap:1rem;
}
.nav-mobile.show {
    display:flex;
}
.nav-mobile a {
    color:#fff;
    padding:0.4rem 0;
}

/* Banner */
.banner {
    width:100%;
    height:460px;
    position:relative;
    background:#1a4778;
    overflow:hidden;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    color:#fff;
}
.banner-video {
    position:absolute;
    width:100%;
    height:100%;
    object-fit:cover;
    z-index:1;
}
.banner-mask {
    position:absolute;
    inset:0;
    background:rgba(0,0,0,0.60);
    z-index:2;
}
.banner-content {
    position:relative;
    z-index:3;
    padding:0 24px;
    max-width:900px;
}
.banner-content h1 {
    font-size:2.4rem;
    margin-bottom:1rem;
    line-height:1.3;
}
.banner-content p {
    font-size:1.2rem;
    opacity:0.92;
    margin-bottom:1.8rem;
}
.btn {
    display:inline-block;
    background:#2478d0;
    color:#fff;
    padding:12px 32px;
    border-radius:6px;
    font-weight:600;
    transition: background 0.3s ease;
}
.btn:hover {
    background:#1b5fa8;
}

/* Container */
.container {
    max-width:1240px;
    margin:56px auto;
    padding:0 24px;
}
.section-title {
    text-align:center;
    margin-bottom:42px;
}
.section-title h2 {
    font-size:2rem;
    color:#0F4C81;
    margin-bottom:10px;
}
.section-title p {
    color:#666;
    max-width:680px;
    margin:0 auto;
}

/* Product grid */
.products {
    display:grid;
    grid-template-columns: repeat(auto-fit, minmax(240px,1fr));
    gap:28px;
}
.item {
    background:#ffffff;
    border-radius:12px;
    overflow:hidden;
    box-shadow:0 3px 14px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.item:hover {
    transform: translateY(-8px);
    box-shadow:0 10px 24px rgba(0,0,0,0.12);
}
.item-img-wrap {
    width:100%;
    height:180px;
    background:#e8edf2;
}
.item-img-wrap img {
    width:100%;
    height:100%;
    object-fit:cover;
}
.item-body {
    padding:20px;
    text-align:center;
}
.item-body h3 {
    color:#0F4C81;
    margin-bottom:10px;
    font-size:1.2rem;
}
.item-body p {
    color:#555;
    font-size:0.95rem;
}

/* Advantage block */
.advantage-wrap {
    background:#ffffff;
    padding:60px 0;
    margin:60px 0;
}
.advantage-grid {
    display:grid;
    grid-template-columns: repeat(auto-fit, minmax(260px,1fr));
    gap:30px;
}
.adv-card {
    text-align:center;
    padding:24px;
}
.adv-card h4 {
    color:#0F4C81;
    margin:14px 0 8px;
    font-size:1.15rem;
}
.adv-card p {
    color:#606060;
}

/* Page inner content */
.page-card {
    background:#fff;
    padding:36px;
    border-radius:12px;
    box-shadow:0 2px 12px rgba(0,0,0,0.06);
}
.page-card h1 {
    color:#0F4C81;
    font-size:2rem;
    margin-bottom:24px;
}
.page-card img {
    width:100%;
    border-radius:8px;
    margin-bottom:24px;
    background:#e8edf2;
}
.page-card ul li {
    list-style:none;
    background:#f7f9fb;
    margin:14px 0;
    padding:18px 22px;
    border-radius:8px;
    border-left:4px solid #0F4C81;
}

/* Contact form */
.contact-grid {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:32px;
}
.form-item {
    margin-bottom:18px;
}
.form-item input,
.form-item textarea {
    width:100%;
    border:1px solid #d2d9e2;
    border-radius:6px;
    padding:14px;
    font-size:1rem;
}
.form-item textarea {
    min-height:140px;
    resize:vertical;
}

/* Footer */
footer {
    background:#0F4C81;
    color:#ffffff;
    text-align:center;
    padding:36px 20px;
    margin-top:70px;
}

/* Mobile */
@media(max-width:768px){
    .nav-desktop {
        display:none;
    }
    .menu-toggle {
        display:block;
    }
    .banner-content h1 {
        font-size:1.8rem;
    }
    .banner {
        height:360px;
    }
    .contact-grid {
        grid-template-columns:1fr;
    }
    .page-card {
        padding:22px;
    }
}