body {
    font-family: Arial;
    margin: 0;
    background: #f5f7fa;
}

/* HEADER */
.header {
    background: #2563eb;
    color: white;
    padding: 15px;
    text-align: center;
}

.header a {
    color: white;
    margin: 0 12px;
    text-decoration: none;
    font-weight: 500;
}

/* GRID CHÍNH */
.container {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 20px;
    padding: 20px;
}

/* SẢN PHẨM */
.products {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.product {
    background: white;
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    transition: 0.3s;
}

.product:hover {
    transform: translateY(-5px);
}

.product img {
    width: 100%;
    border-radius: 8px;
}

.product h3 {
    color: #1f2937;
    margin: 10px 0;
}

.product p {
    color: #dc2626;
    font-weight: bold;
}

/* SIDEBAR */
.sidebar {
    background: white;
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
}

.sidebar h3 {
    margin-top: 0;
    color: #2563eb;
}

.sidebar p {
    color: #374151;
}

/* FOOTER */
.footer {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background: #111827;
    color: #e5e7eb;
    text-align: center;
    padding: 15px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

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

    .footer {
        grid-template-columns: 1fr;
    }
}
/* LOGO */
.logo-area {
    display: flex;
    align-items: center;
    gap: 50px;
    justify-content: center;
}

.logo {
    width: 200px;
}

/* NÚT MUA HÀNG */
.buy-btn {
    margin-top: 10px;
    padding: 8px 15px;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.buy-btn:hover {
    background: #1e40af;
}

.sidebar a {
    display: block;
    text-decoration: none;
    color: #374151;
    margin: 8px 0;
}

.sidebar a:hover {
    color: #2563eb;
}