*{
	box-sizing:border-box
}
body{
    margin:0;
    font-family:Arial,Helvetica,sans-serif;
    background:#f4f6f8;
    color:#1f2933;
}
.container{
    max-width:1100px;
    margin:auto;
    padding:20px;
}

/* АНИМАЦИИ */
.fade-up{
    opacity:1;
    transform:translateY(0px);
    transition:0.8s;
}
/* HEADER */
header{
    background:#0f172a;
    color:#fff;
    padding:80px 20px;
}
header h1{font-size:38px;margin-bottom:15px}
header p{font-size:20px;max-width:700px}
.cta-btn{
    display:inline-block;
    margin-top:25px;
    background:#facc15;
    color:#000;
    padding:15px 30px;
    font-size:18px;
    text-decoration:none;
    font-weight:bold;
    border-radius:6px;
    transition:.3s;
}
.cta-btn:hover{transform:scale(1.05)}

/* SECTIONS */
.section{
    background:#fff;
    margin-top:30px;
    padding:40px 20px;
    border-radius:8px;
}
.section h2{font-size:30px;margin-bottom:20px}

/* CALCULATOR + IMAGE */
.calc-wrap{
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap:30px;
    align-items:center;
}
.calc{
    background:#f9fafb;
    padding:25px;
    border-radius:8px;
}
.calc label{font-weight:bold}
.calc input,.calc select{
    width:100%;
    padding:10px;
    margin:8px 0 15px;
    font-size:16px;
}
.calc-result{
    margin-top:20px;
    font-size:18px;
    line-height:1.6;
}
.price{
    font-size:26px;
    font-weight:bold;
    color:#16a34a;
}
.note{
    font-size:14px;
    color:#6b7280;
}

/* IMAGE */
.product-img img{
    width:100%;
    border-radius:8px;
    box-shadow:0 10px 30px rgba(0,0,0,.15);
}

/* CONTACTS */
.contacts{
    font-size:18px;
    line-height:1.8;
}

/* FOOTER */
footer{
    background:#0f172a;
    color:#fff;
    text-align:center;
    padding:25px;
    margin-top:40px;
}

/* MOBILE */
@media(max-width:900px){
    .calc-wrap{
        grid-template-columns:1fr;
    }
}