:root {
	--bg: #0b0e17; --panel: #131823; --line: #222c3d; --ink: #e7edf5;
	--dim: #93a2b8; --accent: #57d2ff; --warm: #f4c04a; --bad: #ff7b72;
	font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.55; }
header, main, footer { max-width: 1080px; margin: 0 auto; padding: 0 18px; }
header { padding-top: 28px; }
h1 { font-size: 1.7rem; margin: 0 0 6px; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; margin: 26px 0 8px; }
.tagline { color: var(--dim); margin: 0 0 18px; max-width: 62ch; }
main { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr); gap: 22px; align-items: start; }
/* On a phone the answer belongs directly under the photo, not below a screen
   of controls -- that is the thing you opened the page for. */
@media (max-width: 860px) {
	.stage { display: contents; }
	.viewport { order: 1; } .controls { order: 2; } .panel { order: 3; } .hint { order: 4; } .demo-panel { order: 5; }
}
@media (max-width: 860px) { main { grid-template-columns: 1fr; } }

.viewport { position: relative; background: #070a11; border: 1px solid var(--line); border-radius: 12px;
	min-height: 220px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
canvas { display: block; touch-action: none; max-width: 100%; }
.placeholder { position: absolute; text-align: center; color: var(--dim); }
.placeholder p { margin: 4px 0; }
.placeholder .sub { font-size: 0.85rem; }

.controls { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
button, .filebtn, select, input[type="number"] { font: inherit; color: var(--ink); background: var(--panel);
	border: 1px solid var(--line); border-radius: 9px; padding: 8px 13px; cursor: pointer; }
button:hover, .filebtn:hover { border-color: var(--accent); }
.primary { background: var(--accent); color: #06202c; border-color: var(--accent); font-weight: 600; }
.filebtn input { display: none; }
.presets { display: flex; gap: 6px; flex-wrap: wrap; }
.preset { padding: 5px 10px; font-size: 0.85rem; }
.hint { color: var(--dim); font-size: 0.85rem; margin: 6px 0 14px; }
.demo-panel { margin-bottom: 10px; }
.demo-panel label { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; }
.demo-panel[hidden] { display: none; }
.note { font-size: 0.85rem; color: var(--dim); border-left: 2px solid var(--line); padding-left: 10px; margin: 10px 0; }
.budget-box { margin: 12px 0; }
.budget-box summary { cursor: pointer; color: var(--dim); font-size: 0.85rem; }
.budget-box summary:hover { color: var(--ink); }
input[type="range"] { flex: 1; accent-color: var(--accent); }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.settings { display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
	padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.settings label { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; color: var(--dim); }
.settings input[type="number"] { width: 90px; }
.settings .check { cursor: pointer; }

.readout { padding-top: 14px; }
.answer { display: flex; align-items: baseline; gap: 8px; }
.big { font-size: 3rem; font-weight: 700; letter-spacing: -0.03em; line-height: 1; }
.unit { font-size: 1.1rem; color: var(--dim); }
.pm { font-size: 1.3rem; color: var(--accent); margin-left: auto; }
.range { margin: 8px 0; font-size: 0.92rem; }
.dim { color: var(--dim); font-size: 0.85rem; }
.bad { color: var(--bad); font-size: 0.9rem; }
.warn { color: var(--warm); font-size: 0.9rem; }
.truth { color: var(--warm); font-size: 0.9rem; border-top: 1px solid var(--line); padding-top: 10px; }
.chip { padding: 3px 9px; font-size: 0.85rem; border-radius: 999px; }
.alts { font-size: 0.85rem; color: var(--dim); }

table.budget { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 0.87rem; }
.budget th { text-align: left; font-weight: 500; color: var(--dim); border-bottom: 1px solid var(--line); padding: 4px 0; }
.budget td { padding: 3px 0; border-bottom: 1px solid rgba(34,44,61,0.5); }
.budget .num { text-align: right; padding-right: 10px; font-variant-numeric: tabular-nums; }
.budget .dim { font-size: 0.8rem; }

.strip { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.strip button { padding: 4px 9px; font-size: 0.82rem; }
.strip .on { border-color: var(--accent); color: var(--accent); }
.strip .out { opacity: 0.45; text-decoration: line-through; }
.strip .fixed { border-color: var(--warm); }

footer { padding: 10px 18px 60px; color: var(--dim); }
footer p { max-width: 72ch; font-size: 0.9rem; }
footer b, footer code { color: var(--ink); }
code { background: #0e1420; padding: 1px 5px; border-radius: 5px; font-size: 0.85em; }