:root {
    color-scheme: dark;
    --background: #090a0d;
    --panel: rgba(16, 18, 23, 0.93);
    --panel-border: rgba(255, 255, 255, 0.11);
    --control: rgba(255, 255, 255, 0.07);
    --control-hover: rgba(255, 255, 255, 0.12);
    --text: #f4f4f5;
    --muted: #9ca3af;
    --accent: #78d7ff;
    --accent-strong: #3ab9ef;
    --danger: #ff8a8a;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body, .app { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { min-width: 20rem; background: var(--background); color: var(--text); }
button, input, select { font: inherit; }
button, input[type="range"] { accent-color: var(--accent-strong); }

#scene {
    position: absolute;
    inset: 0;
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
}

.toolbar {
    position: absolute;
    z-index: 3;
    top: 0;
    right: 22rem;
    left: 0;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.35rem 1.5rem;
    pointer-events: none;
}

.title, .toolbar-actions { pointer-events: auto; }
.title h1, .panel-heading h2 { margin: 0; font-weight: 650; letter-spacing: -0.025em; }
.title h1 { font-size: clamp(1.45rem, 2.4vw, 2rem); }
.panel-heading h2 { font-size: 1.15rem; }
.eyebrow { display: block; margin-bottom: 0.3rem; color: var(--accent); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.toolbar-actions, .switch-list { display: flex; gap: 0.55rem; }

.button, .icon-button, select, input[type="text"], input[type="number"] {
    border: 1px solid var(--panel-border);
    border-radius: 0.65rem;
    background: var(--control);
    color: var(--text);
}

.button, .icon-button { cursor: pointer; transition: background-color 150ms ease, border-color 150ms ease, transform 150ms ease; }
.button { min-height: 2.45rem; padding: 0.62rem 0.85rem; font-size: 0.82rem; font-weight: 650; }
.button:hover, .icon-button:hover { border-color: rgba(255,255,255,.24); background: var(--control-hover); }
.button:active, .icon-button:active { transform: translateY(1px); }
.button-primary { border-color: rgba(120,215,255,.42); background: rgba(58,185,239,.2); }
.full-button { width: 100%; margin-top: 0.8rem; }
.panel-button, .icon-button { display: none; }

.controls {
    position: absolute;
    z-index: 4;
    top: 0;
    right: 0;
    width: 21rem;
    height: 100%;
    padding: 1.35rem 1.25rem 2rem;
    overflow-y: auto;
    background: var(--panel);
    border-left: 1px solid var(--panel-border);
    box-shadow: -1.5rem 0 4rem rgba(0,0,0,.22);
    backdrop-filter: blur(18px);
}

.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.control-section { padding: 1rem 0; border-top: 1px solid var(--panel-border); }
.control-section h3 { margin: 0 0 .75rem; color: var(--text); font-size: .78rem; letter-spacing: .04em; text-transform: uppercase; }
.control-grid { display: grid; gap: .95rem; }
.number-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .55rem; margin-bottom: .9rem; }
.number-grid label { color: var(--muted); font-size: .68rem; font-weight: 650; }
.number-grid input { width: 100%; margin-top: .35rem; padding: .55rem .45rem; }
.control-label, .range-control label { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: .45rem; color: var(--muted); font-size: .76rem; font-weight: 650; }
.range-control + .range-control { margin-top: .8rem; }
.range-control output { color: var(--text); font-variant-numeric: tabular-nums; }
select, input[type="text"] { width: 100%; padding: .65rem .75rem; outline: none; }
input[type="range"] { width: 100%; margin: 0; }
.error-text { min-height: 1em; margin: .45rem 0 0; color: var(--danger); font-size: .7rem; }

.switch-list { flex-wrap: wrap; margin-top: 1rem; }
.switch { display: inline-flex; align-items: center; gap: .45rem; min-height: 2.25rem; padding: .45rem .65rem; border: 1px solid var(--panel-border); border-radius: .6rem; color: var(--muted); font-size: .76rem; cursor: pointer; }
.switch:has(input:checked) { border-color: rgba(120,215,255,.35); color: var(--text); background: rgba(58,185,239,.1); }
.switch input { margin: 0; }
.legend dl { display: grid; gap: .45rem; margin: 0; }
.legend dl div { display: flex; justify-content: space-between; gap: 1rem; font-size: .72rem; }
.legend dt { color: var(--text); font-family: "Cascadia Code", Consolas, monospace; }
.legend dd { margin: 0; color: var(--muted); }

.status, .instructions { position: absolute; z-index: 2; left: 1.5rem; color: var(--muted); font-size: .72rem; pointer-events: none; }
.status { bottom: 2.6rem; display: flex; flex-wrap: wrap; gap: 1rem; }
.status strong { color: var(--text); font-variant-numeric: tabular-nums; }
.debug-stats { color: var(--accent); }
.instructions { bottom: .8rem; margin: 0; }

.touch-controls { display: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (max-width: 760px) {
    .toolbar { right: 0; align-items: flex-start; padding: 1rem; }
    .desktop-action { display: none; }
    .panel-button, .icon-button { display: inline-grid; place-items: center; }
    .icon-button { width: 2.3rem; height: 2.3rem; padding: 0; font-size: 1.35rem; }
    .controls { top: auto; bottom: 0; width: 100%; height: min(82vh, 44rem); padding: 1.1rem 1rem calc(1.5rem + env(safe-area-inset-bottom)); border-top: 1px solid var(--panel-border); border-left: 0; border-radius: 1rem 1rem 0 0; transform: translateY(calc(100% + 1rem)); visibility: hidden; transition: transform 220ms ease, visibility 0s linear 220ms; }
    .controls.is-open { transform: translateY(0); visibility: visible; transition-delay: 0s; }
    .status { bottom: calc(7.2rem + env(safe-area-inset-bottom)); left: 1rem; max-width: calc(100% - 2rem); }
    .instructions { display: none; }
    .touch-controls { position: absolute; z-index: 2; right: 1rem; bottom: calc(1rem + env(safe-area-inset-bottom)); display: grid; grid-template-columns: repeat(3, 2.8rem); grid-template-areas: ". forward up" "left backward right" ". down ."; gap: .35rem; }
    .touch-controls button { width: 2.8rem; height: 2.8rem; padding: 0; border: 1px solid rgba(255,255,255,.18); border-radius: .75rem; background: rgba(17,19,24,.72); color: var(--text); font-weight: 700; backdrop-filter: blur(8px); touch-action: none; }
    .touch-controls button[data-action="forward"] { grid-area: forward; }
    .touch-controls button[data-action="left"] { grid-area: left; }
    .touch-controls button[data-action="backward"] { grid-area: backward; }
    .touch-controls button[data-action="right"] { grid-area: right; }
    .touch-controls button[data-action="down"] { grid-area: down; }
    .touch-controls button[data-action="up"] { grid-area: up; }
    .touch-controls button.is-active { border-color: var(--accent); background: rgba(58,185,239,.28); }
}

@media (max-width: 440px) {
    .title .eyebrow { display: none; }
    .title h1 { font-size: 1.25rem; }
    .toolbar-actions { gap: .35rem; }
    .button { padding-right: .68rem; padding-left: .68rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: .01ms !important; }
}