:root {
    --bg: #04070f;
    --panel: #0d1730;
    --line: #2e4a85;
    --ink: #eaf2ff;
    --muted: #9eb2de;
    --cyan: #3df4ff;
    --pink: #ff61d8;
    --amber: #ffc86f;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 20% 8%, rgba(61, 244, 255, 0.14), transparent 42%),
        radial-gradient(circle at 82% 14%, rgba(255, 97, 216, 0.13), transparent 42%),
        linear-gradient(170deg, #04060c, #04070f 45%, #020409);
    display: flex;
    justify-content: center;
    padding: 1rem;
}

.app {
    width: min(1060px, 100%);
    display: grid;
    gap: 0.95rem;
}

.panel {
    border: 1px solid var(--line);
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(13, 23, 48, 0.96), rgba(7, 12, 26, 0.96));
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.35);
}

.topbar {
    padding: 1rem;
}

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

h1 {
    margin: 0.62rem 0 0.35rem;
    font-size: clamp(1.35rem, 3vw, 2rem);
}

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

.controls {
    padding: 0.82rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(140px, 1fr));
    gap: 0.58rem;
    align-items: end;
}

.upload {
    display: grid;
    gap: 0.35rem;
    font-size: 0.82rem;
    color: var(--muted);
}

.upload input[type="file"] {
    width: 100%;
    font-size: 0.78rem;
    color: var(--ink);
    border: 1px solid #3f5ea5;
    border-radius: 9px;
    background: #11214b;
    padding: 0.35rem;
}

.presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.42rem;
}

label {
    display: grid;
    gap: 0.26rem;
    color: var(--muted);
    font-size: 0.8rem;
}

input[type="range"] {
    width: 100%;
    accent-color: #73a2ff;
}

button {
    border: 1px solid #3a58a0;
    border-radius: 8px;
    background: #12224c;
    color: var(--ink);
    padding: 0.5rem 0.7rem;
    font-size: 0.84rem;
    font-weight: 650;
    cursor: pointer;
    transition: transform 120ms ease, border-color 120ms ease;
}

button:hover {
    transform: translateY(-1px);
    border-color: #6a8ae0;
}

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

.preset.active {
    border-color: var(--amber);
    background: linear-gradient(180deg, #795e26, #5f4516);
}

.actions {
    display: flex;
    gap: 0.5rem;
}

button.accent {
    border-color: #7a5cf1;
    background: linear-gradient(180deg, #6e50d6, #4f369e);
}

.toggles {
    display: flex;
    gap: 0.8rem;
    grid-column: 1 / -1;
    font-size: 0.82rem;
}

.toggles label {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--ink);
    font-size: 0.84rem;
}

.stage {
    padding: 0.9rem;
    display: grid;
    justify-items: center;
    gap: 0.65rem;
    position: relative;
}

canvas {
    width: min(540px, 100%);
    height: auto;
    display: block;
    border-radius: 10px;
    border: 1px solid #35589f;
    image-rendering: pixelated;
    background: #060910;
}

.scan-overlay {
    position: absolute;
    width: min(540px, calc(100% - 1.8rem));
    aspect-ratio: 3 / 4;
    top: 0.9rem;
    border-radius: 10px;
    pointer-events: none;
    background: repeating-linear-gradient(to bottom, rgba(255,255,255,0.08) 0, rgba(255,255,255,0.08) 1px, transparent 1px, transparent 4px);
    mix-blend-mode: soft-light;
    opacity: 0.95;
}

#status {
    margin: 0;
    color: var(--muted);
    font-size: 0.86rem;
    text-align: center;
}

@media (max-width: 860px) {
    .controls {
        grid-template-columns: repeat(2, minmax(130px, 1fr));
    }

    .actions,
    .presets {
        grid-column: 1 / -1;
    }
}

@media (max-width: 560px) {
    .controls {
        grid-template-columns: 1fr;
    }

    .toggles {
        flex-direction: column;
        gap: 0.4rem;
    }
}