@font-face {
    font-family: 'Postamt';
    src: url('../fonts/Postamt.woff2') format('woff2'), /* Format modern & ringan */
         url('../fonts/Postamt.ttf') format('truetype'); /* Format fallback jika woff2 tidak didukung */
    font-weight: normal;
    font-style: normal;
}

body{
    min-height:100vh;
    margin:0;

    display:flex;
    justify-content:center;
    align-items:center;

    font-family:'Onest',sans-serif !important;

    background-image:url('../img/background-paket.png');
    background-repeat:no-repeat;
    background-position:center;
    background-size:cover;
}

.logo-brand{
    position:absolute;
    left:40px;
    top:30px;
    font-size:32px;
    font-weight:700;
    color:#e53935;
    font-family: 'Postamt', Georgia, serif !important;
    text-transform: capitalize;
}

.package-title{
    position:absolute;
    right:70px;
    top:35px;
    font-size:32px;
    font-weight:700;
}

.gass-basic {
    color:#09D8C2;
}

.gass-pro {
    color:#0179E2;
}

.gass-elite {
    color:#4C39F0;
}

.gass-ultra {
    color:#CF020D;
}

.form-card{
    width:100%;
    max-width:700px;
    position:relative;
    padding:45px;
    border-radius:24px;
    margin-top: 40px;
    background:rgba(255,255,255,.35);
    backdrop-filter:blur(15px);
    -webkit-backdrop-filter:blur(15px);

    border:1px solid rgba(255,255,255,.3);

    box-shadow:
        0 10px 30px rgba(0,0,0,.15);

    overflow:hidden;
}

.form-card h1{
    font-size:42px;
    font-weight:700;
    color:#1e293b;
    margin-bottom:8px;
}

.subtitle{
    color:#475569;
    font-size:14px;
    line-height:1.7;
    margin-bottom:30px;
}

.badge-basic{
    position:absolute;
    top:0;
    right:0;
}

.badge-basic img{
    width:140px;
    height:auto;
}

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

.form-group label{
    display:block;
    margin-bottom:8px;
    color:#334155;
    font-size:14px;
    font-weight:500;
}

.form-group input{
    width:100%;
    height:56px;

    border:none;
    outline:none;

    border-radius:10px;

    background:rgba(255,255,255,.9);

    padding:0 18px;

    font-size:14px;

    box-sizing:border-box;
}

.form-basic .form-group input:focus{
    border:2px solid #09D8C2;
}

.form-pro .form-group input:focus{
    border:2px solid #0179E2;
}

.form-elite .form-group input:focus{
    border:2px solid #4C39F0;
}

.form-ultra .form-group input:focus{
    border:2px solid #CF020D;
}

button{
    width:100%;
    height:60px;

    border:none;
    border-radius:50px;

    background:#142742;

    color:#fff;

    font-size:22px;
    font-weight:700;

    cursor:pointer;

    transition:.3s;
}

button:hover{
    background:#0f1e33;
    transform:translateY(-2px);
}

@media(max-width:768px){

    body{
        padding:20px;
    }

    .form-card{
        padding:25px;
    }

    .form-card h1{
        font-size:32px;
    }

    .badge-basic img{
        width:100px;
    }

    button{
        font-size:18px;
    }

    .logo-brand{
        position:fixed;
        top:15px;
        left:20px;

        font-size:24px;
    }

    .package-title{
        position:fixed;
        top:15px;
        right:20px;

        font-size:16px;
    }

    .form-card{
        margin-top:60px;
    }
}

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

.invalid-feedback{
    display:none;
    color:#dc3545;
    font-size:13px;
    margin-top:5px;
}

input:invalid{
    border:1px solid #dc3545;
}

input:valid{
    border:1px solid #28a745;
}

input:invalid + .invalid-feedback{
    display:block;
}