.discount-container{
    max-width:700px;
    margin:50px auto;
    padding:35px;
    background:#fff;
    border-radius:16px;
    box-shadow:0 8px 24px rgba(15,23,42,.08);
    animation:fadeUp .4s ease;
}

.discount-container h1{
    text-align:center;
    margin-bottom:10px;
    color:#2563eb;
}

.discount-container > p{
    text-align:center;
    margin-bottom:25px;
    color:#666;
    line-height:1.6;
}

.input-group{
    margin-bottom:20px;
}

.input-group label{
    display:block;
    margin-bottom:8px;
    font-weight:600;
    color:#333;
}

.input-hint-inline{
    font-weight:400;
    font-size:13px;
    color:#888;
}

.input-group input{
    width:100%;
    padding:14px;
    font-size:18px;
    font-family:'Kanit',sans-serif;
    border:2px solid #ddd;
    border-radius:10px;
    transition:.25s;
}

.input-group input:focus{
    border-color:#2563eb;
    outline:none;
    box-shadow:0 0 0 3px rgba(37,99,235,.15);
}

.input-hint{
    display:block;
    margin-top:6px;
    font-size:13px;
    color:#888;
}

#calculateBtn{
    width:100%;
    padding:16px;
    background:#2563eb;
    color:#fff;
    font-size:20px;
    font-family:'Kanit',sans-serif;
    font-weight:700;
    border:none;
    border-radius:10px;
    cursor:pointer;
    transition:.25s;
}

#calculateBtn:hover{
    background:#1d4ed8;
    transform:translateY(-2px);
}

#calculateBtn:active{
    transform:scale(.98);
}

#calculateBtn:focus-visible{
    outline:3px solid rgba(37,99,235,.25);
    outline-offset:2px;
}

.result{
    margin-top:35px;
    padding:25px;
    background:#f8fafc;
    border:1px solid #e5e7eb;
    border-radius:12px;
    text-align:center;
}

.result h2{
    margin-top:0;
    margin-bottom:20px;
}

.result h3{
    font-size:30px;
    color:#2563eb;
    margin-bottom:18px;
    word-break:break-word;
    transition:.25s;
}

.result p{
    margin:10px 0;
    color:#555;
}

.result-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:16px;
    margin-top:20px;
    text-align:left;
}

.result-grid .item{
    background:#fff;
    border:1px solid #e5e7eb;
    border-radius:10px;
    padding:14px 16px;
}

.result-grid .item span{
    display:block;
}

.result-grid .item .label{
    font-size:13px;
    color:#888;
    margin-bottom:4px;
}

.result-grid .item .value{
    font-size:18px;
    font-weight:700;
    color:#1e293b;
}

.back{
    display:block;
    margin-top:30px;
    text-align:center;
    font-weight:600;
    color:#2563eb;
    text-decoration:none;
    transition:.25s;
}

.back:hover{
    text-decoration:underline;
}

/* =======================================
   ตารางขั้นตอนการคำนวณส่วนลดซ้อน
======================================= */

.schedule{
    margin-top:40px;
    padding-top:10px;
}

.schedule h2{
    margin-bottom:18px;
    text-align:center;
    color:#2563eb;
}

.table-wrapper{
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
}

#breakdownTable{
    width:100%;
    min-width:500px;
    margin-top:20px;
    border-collapse:collapse;
    background:#fff;
}

#breakdownTable th,
#breakdownTable td{
    padding:12px;
    border:1px solid #e5e7eb;
    text-align:center;
}

#breakdownTable th{
    background:#2563eb;
    color:#fff;
    font-weight:600;
}

#breakdownTable tbody tr:nth-child(even){
    background:#f8fafc;
}

.disclaimer{
    margin-top:20px;
    padding:14px 18px;
    background:#fffbeb;
    border:1px solid #fde68a;
    border-radius:10px;
    font-size:14px;
    color:#78350f;
    line-height:1.6;
}

/* =======================================
   Responsive
======================================= */

@media (max-width:768px){

    .discount-container{
        margin:20px auto;
        padding:22px;
    }

    .discount-container h1{
        font-size:30px;
    }

    .discount-container > p{
        font-size:16px;
    }

    .input-group input{
        font-size:16px;
        padding:13px;
    }

    #calculateBtn{
        font-size:18px;
        padding:15px;
    }

    .result{
        padding:20px;
    }

    .result h3{
        font-size:24px;
    }

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

    #breakdownTable{
        min-width:460px;
    }
}

@media (max-width:480px){

    .discount-container{
        margin:15px;
        padding:18px;
    }

    .discount-container h1{
        font-size:26px;
    }

    .result h3{
        font-size:22px;
    }

    #breakdownTable{
        min-width:420px;
    }

    #breakdownTable th,
    #breakdownTable td{
        padding:10px;
        font-size:14px;
    }
}