body {
    margin: 0;
    font-family: 'Segoe UI', Roboto, sans-serif;
    background: #fff;
}
a { text-decoration: none; color: inherit; }
.navbar {
    background: #003366;
    color: #fff;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}
.navbar img {
    height: 50px;
}
.navbar nav {
    display: flex;
    gap: 20px;
}
.navbar nav a {
    color: #fff;
    font-weight: bold;
}
.hero {
    /* background: #003366;*/
    color: white;
    text-align: center;
    padding: 60px 20px;
	background: linear-gradient(to right, #003366, #0055a5);
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
    padding: 120px 20px;
    position: relative;
	background: linear-gradient(to right, rgba(0,51,102,0.7), rgba(0,85,165,0.7)),
                url('images/banner.jpg') center center/cover no-repeat;
    color: white;
    text-align: center;
    padding: 120px 20px;
    position: relative;
}
.btn-primary {
    display: inline-block;
    background: #FFC107;
    color: #003366;
    padding: 12px 24px;
    border-radius: 4px;
    margin-top: 20px;
}
.btn-primary-light {
    display: inline-block;
    background: #fff;
    color: #003366;
    padding: 12px 24px;
    border-radius: 4px;
    margin-top: 20px;
    border: 1px solid #FFC107;
}
.services {
    background: #f7f7f7;
    padding: 60px 20px;
}
.services h2 {
    text-align: center;
    color: #C62828;
    margin-bottom: 40px;
}
.service-cards {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}
.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    flex: 1 1 300px;
    max-width: 300px;
    text-align: center;
}
.card img {
    max-width: 50%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 10px;
}
.about {
    padding: 60px 20px;
}
.about-flex {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: center;
}
.about-text {
    flex: 1;
}
.about-img img {
    max-width: 50% !important;
    border-radius: 8px;
}
.cta-hero {
    background: linear-gradient(to right, #003366, #0055a5);
    color: white;
    text-align: center;
    padding: 120px 20px;
}
.cta-hero h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}
.cta-hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}
.contact-buttons {
    background: #f7f7f7;
    text-align: center;
    padding: 30px 20px;
}
.contact-buttons .btn-contact {
    display: inline-block;
    margin: 10px;
    padding: 12px 24px;
    border-radius: 4px;
    background: #003366;
    color: white;
    font-weight: bold;
    transition: background 0.3s ease;
}
.contact-buttons .btn-contact:hover {
    background: #C62828;
}
.contact-buttons .btn-contact.zalo {
    background: #00ADEF;
}
.contact-buttons .btn-contact.zalo:hover {
    background: #007BB6;
}
footer {
    background: #111;
    color: #ccc;
    padding: 40px 20px 20px;
}
.footer-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    justify-content: space-between;
}
footer h4 {
    margin-bottom: 10px;
}
footer p {
    margin: 5px 0;
}
.copyright {
    text-align: center;
    padding-top: 20px;
    font-size: 0.9em;
}
@media (max-width: 768px) {
    .navbar nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .about-flex {
        flex-direction: column;
    }
    .service-cards {
        flex-direction: column;
        align-items: center;
    }

}