*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:'Segoe UI',sans-serif;
}

body{
    min-height:100vh;
    padding:30px;
    background:linear-gradient(135deg,#0f172a,#1e293b,#334155);
    color:white;
}

.container{
    max-width:1800px;
    margin:auto;
}

h1{
    text-align:center;
    margin-bottom:30px;
    color:#38bdf8;
    font-size:2.8rem;
}

.input-section{
    display:flex;
    justify-content:center;
    gap:10px;
    flex-wrap:wrap;
}

input{
    padding:12px;
    width:250px;
    border:none;
    border-radius:10px;
    font-size:16px;
}

button{
    padding:12px 25px;
    border:none;
    border-radius:10px;
    background:#38bdf8;
    color:white;
    font-size:16px;
    cursor:pointer;
    transition:.3s;
}

button:hover{
    transform:translateY(-3px);
    background:#0ea5e9;
}

#calendar{
    margin-top:35px;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(420px,1fr));
    gap:25px;
}

.month{
    background:rgba(255,255,255,.08);
    backdrop-filter:blur(10px);
    border-radius:18px;
    padding:30px;
    box-shadow:0 10px 25px rgba(0,0,0,.3);
    transition:.3s;
    overflow:hidden;
    width:100%;
}

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

.month h3{
    text-align:center;
    margin-bottom:15px;
    color:#facc15;
    font-size:2rem;
}

table{
    width:100%;
    border-collapse:collapse;
    table-layout:fixed;
}

th{
    padding:12px;
    background:#38bdf8;
    color:white;
}

td{
    text-align:center;
    padding:12px;
    border:1px solid rgba(255,255,255,.08);
    transition:.3s;
}

td:hover{
    background:rgba(255,255,255,.1);
}

.today{
    background:#22c55e !important;
    color:white;
    font-weight:bold;
    box-shadow:0 0 15px #22c55e;
}

.holiday{
    background:#ef4444 !important;
    color:white;
    font-weight:bold;
}

.today.holiday{
    background:#f97316 !important;
}

@media(max-width:600px){

    body{
        padding:15px;
    }

    h1{
        font-size:2rem;
    }

    input,
    button{
        width:100%;
    }

    #calendar{
        grid-template-columns:1fr;
    }

    .month{
        padding:20px;
        overflow-x:auto;
    }

    th,
    td{
        padding:8px;
        font-size:14px;
    }
}