/* Thiết lập chung */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Roboto', sans-serif; line-height: 1.6; color: #333; overflow-x: hidden; }
.container { max-width: 1100px; margin: auto; padding: 0 20px; }
.d-flex { display: flex; justify-content: space-between; align-items: center; }
.section { padding: 60px 0; }
.section-title { text-align: center; font-size: 28px; color: #004a99; margin-bottom: 40px; position: relative; }
.section-title::after { content: ''; width: 60px; height: 3px; background: #d90429; position: absolute; bottom: -10px; left: 50%; transform: translateX(-50%); }

/* Navbar */
.navbar { background: #fff; height: 75px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
.logo { font-size: 30px; font-weight: bold; color: #004a99; letter-spacing: 1px; }
.logo span { color: #d90429; }
.nav-links { list-style: none; display: flex; }
.nav-links li a { text-decoration: none; color: #333; padding: 0 15px; font-weight: 500; transition: 0.3s; }
.nav-links li a:hover { color: #d90429; }
.btn-hotline { background: #d90429; color: #fff; padding: 10px 18px; border-radius: 4px; text-decoration: none; font-weight: bold; }

/* Hero */
.hero { background: url('anh-tho.jpg') no-repeat center center/cover; height: 85vh; color: #fff; position: relative; }
.hero-overlay { background: rgba(0, 0, 0, 0.6); height: 100%; display: flex; align-items: center; text-align: center; }
.hero h1 { font-size: 45px; margin-bottom: 20px; text-shadow: 2px 2px 4px rgba(0,0,0,0.5); }
.hero p { font-size: 20px; margin-bottom: 30px; }
.btn { padding: 15px 30px; border-radius: 5px; text-decoration: none; font-weight: bold; display: inline-block; margin: 10px; transition: 0.3s; }
.btn-red { background: #d90429; color: #fff; }
.btn-red:hover { background: #b00320; }
.btn-blue { background: #004a99; color: #fff; }

/* Dịch vụ */
.service-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.service-card { background: #fff; padding: 35px; border-radius: 8px; text-align: center; border: 1px solid #eee; transition: 0.3s; }
.service-card:hover { box-shadow: 0 10px 20px rgba(0,0,0,0.1); transform: translateY(-5px); border-bottom: 4px solid #004a99; }
.service-card i { font-size: 45px; color: #d90429; margin-bottom: 20px; }
.service-card h3 { margin-bottom: 10px; color: #004a99; }

/* Liên hệ & Bản đồ */
.contact-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center; }
.address-box p { margin-bottom: 15px; font-size: 17px; }
.address-box i { color: #d90429; margin-right: 10px; width: 20px; }

/* Footer */
.footer { background: #222; color: #fff; padding: 30px 0; text-align: center; border-top: 5px solid #d90429; }

/* Mobile */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .contact-wrapper { grid-template-columns: 1fr; }
    .hero h1 { font-size: 30px; }
}