:root { color-scheme: dark; --ground: #142e36; --ink: #f4f1e7; --muted: #bcd1d3; --accent: #ffca6b; --line: #57777f; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--ground); color: var(--ink); font: 1rem/1.6 system-ui, sans-serif; }
::selection { background: var(--accent); color: var(--ground); }
main { max-width: 100rem; margin: auto; padding: clamp(1rem, 3vw, 3rem); display: grid; grid-template-columns: minmax(17rem, 0.8fr) minmax(0, 1.4fr); gap: 2.5rem; }
h1 { font-size: clamp(2rem, 3.5vw, 3.5rem); line-height: 1.3; font-weight: 650; letter-spacing: -0.03em; text-wrap: balance; margin: 0 0 1.5rem; }
p { max-width: 66ch; margin: 1rem 0; }
.intro { font-size: 1.25rem; color: var(--accent); }
ol { padding-left: 1.5rem; margin: 1.5rem 0 2rem; }
li { padding-left: 0.35rem; margin: 0.8rem 0; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
button { font: inherit; font-weight: 650; border: 1px solid var(--accent); background: var(--accent); color: var(--ground); padding: 0.65rem 1.1rem; border-radius: 0.35rem; min-height: 3rem; cursor: pointer; }
button:hover:enabled { background: #ffdc9e; }
button:disabled { background: #304e56; color: var(--muted); border-color: var(--line); cursor: default; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
#availability, .version { color: var(--muted); }
.version { font-size: 0.875rem; }
.stage { min-width: 0; align-self: start; }
#viewport { aspect-ratio: 1.15; background: #203f48; overflow: hidden; border-radius: 0.5rem; }
canvas { display: block; width: 100%; height: 100%; }
.readout { display: flex; flex-wrap: wrap; gap: .5rem 1rem; padding-top: 1rem; align-items: baseline; }
#status { flex: 1 1 17rem; min-width: 0; }
#score { white-space: nowrap; color: var(--accent); font-variant-numeric: tabular-nums; font-size: 1.4rem; }
details { grid-column: 1 / -1; border-top: 1px solid var(--line); padding-top: 1rem; }
summary { cursor: pointer; width: fit-content; font-weight: 650; }
.sliders { display: flex; flex-wrap: wrap; gap: 1.5rem; margin: 1rem 0; }
.sliders label { display: grid; gap: 0.5rem; flex: 1 1 13rem; }
input { accent-color: var(--accent); caret-color: var(--accent); }
input[type=range] { width: 100%; min-height: 2.75rem; }
.toggle { display: block; min-height: 2.75rem; }
@media (max-width: 56rem) { main { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; } .stage { grid-row: 2; } #viewport { aspect-ratio: 1.25; } }

.placement { grid-column: 1 / -1; }
.placement-buttons { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: .65rem; max-width: 52rem; }
.placement-buttons button { background: #36545b; color: var(--ink); border-color: var(--line); }
.placement-buttons button:hover:enabled { color: var(--ground); }
html { scrollbar-color: var(--line) var(--ground); }