:root{
    --bg:#0a0a0a;
    --accent:#FFFFC5;
    --glass:rgba(255,255,255,0.05);
    --border:rgba(255,255,255,0.15);
}

body{
    margin:0;
    min-height:100vh;
    background:radial-gradient(circle at top,#111 0%,#000 60%);
    color:var(--accent);
    font-family:system-ui,sans-serif;
}

.app{
    max-width:1100px;
    margin:0 auto;
    padding:40px 20px;
}

.panel{
    background:var(--glass);
    backdrop-filter:blur(12px);
    border:1px solid var(--border);
    border-radius:16px;
    padding:24px;
    margin-bottom:28px;
    display:flex;
    flex-direction:column;
    gap:16px;
    align-items:center;
}

.btn-row{
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    justify-content:center;
}

button{
    background:transparent;
    color:var(--accent);
    border:1px solid var(--accent);
    padding:8px 16px;
    border-radius:12px;
    cursor:pointer;
    transition:.25s;
}

button:hover{
    background:var(--accent);
    color:#000;
    box-shadow:0 0 18px rgba(255,255,197,.4);
}

.size-row{
    display:flex;
    gap:10px;
    align-items:center;
}

.size-row input{
    width:42px;
    background:transparent;
    border:none;
    border-bottom:2px solid var(--accent);
    color:var(--accent);
    text-align:center;
    outline:none;
}

.matrix{
    display:grid;
    gap:6px 8px;
    margin-top:10px;
}

.matrix input{
    width:42px;
    background:transparent;
    border:none;
    border-bottom:2px solid var(--accent);
    color:var(--accent);
    text-align:center;
    outline:none;
}

pre{
    font-size:1.15rem;
    text-align:center;
}

.hidden{
    display:none;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type=number] {
    -moz-appearance: textfield;
}
.matrix-title {
    text-align: center;
    margin-bottom: 6px;
}