body {
    margin:0;
    font-family: Arial;
    background:#0b0b0f;
    color:#eaeaea;
}

.container {
    max-width:1000px;
    margin:auto;
    padding:30px 18px;
}

.header {
    text-align:center;
    padding:40px 15px 10px;
}

.header h1 {
    font-size:32px;
}

.header p {
    color:#aaa;
}

.grid {
    display:flex;
    gap:20px;
    margin-top:20px;
}

/* LEFT */
.left {
    flex:1;
}

/* RIGHT */
.right {
    flex:1;
}

.card {
    background:#141420;
    padding:22px;
    border-radius:14px;
    border:1px solid rgba(255,255,255,0.06);
}

h2 {
    margin-bottom:12px;
}

input[type="range"] {
    width:100%;
    margin:10px 0;
}

label {
    font-size:14px;
    color:#ccc;
}

button {
    width:100%;
    padding:14px;
    margin-top:15px;
    background:linear-gradient(90deg,#ff0000,#cc0000);
    border:none;
    color:#fff;
    border-radius:10px;
    cursor:pointer;
}

.output {
    background:#0f0f15;
    padding:15px;
    border-radius:10px;
    margin:15px 0;
    word-break:break-all;
    min-height:50px;
}

.footer {
    text-align:center;
    margin-top:50px;
    padding:20px;
    font-size:13px;
    color:#666;
    border-top:1px solid rgba(255,255,255,0.06);
}

/* MOBILE */
@media(max-width:768px){
    .grid {
        flex-direction:column;
    }
}