body{
    background:#f4f7fb;
}

/* HERO */
.lab-hero{
    padding:60px 0;
    text-align:center;
    background:#fff;
}

.lab-hero h1{
    font-size:52px;
    font-weight:800;
    color:#0f172a;
    margin-bottom:10px;
}

.lab-hero p{
    font-size:20px;
    color:#64748b;
}

/* SECTION */
.lab-section{
    padding:60px 0;
}

.format-row{
    background:#fff;
    padding:30px;
    border-radius:20px;
    margin-bottom:40px;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
}

.format-header{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:25px;
}

.format-header h2{
    margin:0;
    font-size:32px;
    font-weight:800;
    color:#0f172a;
}

.demo-btn{
    background:#2563eb;
    color:#fff;
    padding:12px 24px;
    border-radius:8px;
    text-decoration:none;
    font-weight:700;
}

.demo-btn:hover{
    color:#fff;
}

/* A4 Preview */
.a4-preview{
    text-align:center;
}

.a4-preview img{
    width:100%;
    max-width:900px;
    height:auto;
    border:1px solid #ddd;
    border-radius:8px;
    box-shadow:0 10px 25px rgba(0,0,0,.15);
}

/* Mobile */
@media(max-width:768px){

    .lab-hero h1{
        font-size:34px;
    }

    .lab-hero p{
        font-size:16px;
    }

    .format-header{
        flex-direction:column;
        gap:15px;
    }

    .format-header h2{
        font-size:24px;
        text-align:center;
    }

    .format-row{
        padding:15px;
    }

    .a4-preview img{
        width:100%;
    }
}