body {
    background-color: #f4f4f4;
    color: #333;
}

/* Hero */
.hero {
    /* IMPORTANT: đường dẫn ảnh đúng từ thư mục /style */
    background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
                      url('../assets/hero.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: #fff;
    text-align: center;
    padding: 120px 20px;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
}

/* Nút trong hero */
.hero .btn {
    display: inline-block;
    background-color: #007bff;
    color: #fff;
    padding: 15px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.hero .btn:hover {
    background-color: #0056b3;
}

/* Khối tính năng */
.features {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    padding: 40px 0;
}

.feature-item {
    text-align: center;
    max-width: 280px;
    margin: 20px;
}

.feature-item .icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

/* Footer riêng của trang chủ (nếu chưa dùng footer chung) */
.footer {
    background-color: rgba(24, 78, 133, 0.9);
    color: #fff;
    text-align: center;
    padding: 15px 20px;
    margin-top: 20px;
}

/* Responsive */
@media screen and (max-width: 768px) {
    .hero {
        padding: 80px 16px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1rem;
    }
}