:root {
    --bg: #05060b;
    --panel: #111834;
    --line: #35508a;
    --text: #ecf2ff;
    --muted: #a8b8de;
    --amber: #ffca72;
    --good: #84ffaf;
    --bad: #ff8fb6;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 16% 8%, rgba(83, 255, 239, 0.12), transparent 44%),
        radial-gradient(circle at 84% 12%, rgba(255, 97, 196, 0.13), transparent 45%),
        linear-gradient(160deg, #010308, #080d1f 48%, #04060d);
    display: flex;
    justify-content: center;
    padding: 1rem;
}

.app {
    width: min(980px, 100%);
    display: grid;
    gap: 0.82rem;
}

.panel {
    background: linear-gradient(180deg, rgba(17, 24, 52, 0.95), rgba(8, 12, 27, 0.96));
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.34);
}

.topbar {
    padding: 0.92rem 1rem;
}

.back {
    text-decoration: none;
    color: var(--amber);
    font-weight: 700;
}

h1 {
    margin: 0.66rem 0 0.35rem;
    font-size: clamp(1.35rem, 3.4vw, 2rem);
}

.topbar p {
    margin: 0;
    color: var(--muted);
}

.controls {
    padding: 0.8rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(150px, 1fr));
    gap: 0.6rem;
    align-items: end;
}

.field {
    display: grid;
    gap: 0.26rem;
}

label {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    font-size: 0.68rem;
}

input,
select,
button {
    border: 1px solid #3f5f9f;
    border-radius: 9px;
    background: #142450;
    color: var(--text);
    font: inherit;
    font-size: 0.9rem;
    padding: 0.5rem 0.58rem;
}

input:focus,
select:focus,
button:focus {
    outline: 2px solid rgba(86, 246, 255, 0.42);
    outline-offset: 1px;
}

.buttons {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(4, minmax(120px, 1fr));
    gap: 0.5rem;
}

button {
    cursor: pointer;
    font-weight: 650;
    transition: transform 120ms ease, border-color 120ms ease;
}

button:hover {
    transform: translateY(-1px);
    border-color: #78a8ff;
}

button:active {
    transform: translateY(1px);
}

button.accent {
    border-color: #b06cff;
    background: linear-gradient(180deg, #7f48d2, #57359a);
}

.status {
    grid-column: 1 / -1;
    margin: 0.1rem 0 0;
    border-top: 1px dashed #2f497f;
    padding-top: 0.62rem;
    color: var(--muted);
    min-height: 1.5rem;
}

.status.good { color: var(--good); }
.status.bad { color: var(--bad); }

.stage {
    padding: 0.8rem;
    display: grid;
    gap: 0.6rem;
}

.stage-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.8rem;
}

h2 {
    margin: 0;
    font-size: 1.02rem;
}

.stage-head p {
    margin: 0;
    color: var(--muted);
    font-size: 0.86rem;
}

canvas {
    width: 100%;
    border: 1px solid #4368ab;
    border-radius: 12px;
    background: linear-gradient(180deg, #111e43, #0c1732);
    image-rendering: pixelated;
}

@media (max-width: 760px) {
    .controls {
        grid-template-columns: 1fr;
    }

    .buttons {
        grid-template-columns: repeat(2, minmax(120px, 1fr));
    }
}