:root {
  color-scheme: dark;
  --page: #17191d;
  --panel: #22262d;
  --canvas: #1c2026;
  --line: #363d47;
  --text: #eef1f5;
  --muted: #a9b1bc;
  --positive: #ef5d67;
  --negative: #5c9dff;
  --focus: #c7d8ff;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--page); color: var(--text); font: 16px/1.45 Inter, ui-sans-serif, system-ui, sans-serif; }
button, input { font: inherit; }
button { cursor: pointer; }
.app-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 32px 0; }
header { display: flex; justify-content: space-between; gap: 20px; align-items: center; margin-bottom: 24px; }
h1, h2, p { margin: 0; }
h1 { font-size: clamp(1.6rem, 3vw, 2.3rem); letter-spacing: -.03em; }
h2 { font-size: 1rem; }
.eyebrow { color: var(--muted); font-size: .78rem; letter-spacing: .09em; text-transform: uppercase; margin-bottom: 4px; }
.workspace { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 18px; }
.sidebar, .field-panel { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; }
.sidebar { padding: 18px; }
.control-section + .control-section { border-top: 1px solid var(--line); margin-top: 20px; padding-top: 20px; }
.control-section > p, .control-help { color: var(--muted); font-size: .83rem; margin-top: 6px; }
.source-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 14px; }
.source { display: grid; justify-items: center; gap: 7px; padding: 10px 5px; background: #2b3039; color: var(--text); border: 1px solid transparent; border-radius: 10px; }
.source[aria-pressed="true"] { border-color: var(--focus); box-shadow: 0 0 0 2px #c7d8ff26; }
.source-positive:hover { border-color: var(--positive); }
.source-negative:hover { border-color: var(--negative); }
.charge-icon { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; color: white; font-size: 1.35rem; font-weight: 700; }
.source-positive .charge-icon { background: var(--positive); }
.source-negative .charge-icon { background: var(--negative); }
label { display: flex; justify-content: space-between; gap: 8px; margin-top: 15px; color: var(--text); font-size: .9rem; }
output { color: var(--muted); font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: #aab8ca; margin-top: 7px; }
.readout { display: grid; gap: 9px; border-top: 1px solid var(--line); margin-top: 20px; padding-top: 18px; }
.readout div { display: flex; justify-content: space-between; color: var(--muted); font-size: .86rem; }
.readout strong { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.button { border: 1px solid var(--line); border-radius: 9px; padding: 9px 13px; color: var(--text); background: #2b3039; }
.button:hover { filter: brightness(1.12); }
.button-danger { border-color: #81424a; background: #47292e; }
.field-panel { padding: 12px; min-width: 0; }
#field-canvas { display: block; width: 100%; aspect-ratio: 1.42 / 1; background: var(--canvas); border-radius: 8px; touch-action: none; }
.canvas-hint { padding: 10px 3px 1px; color: var(--muted); font-size: .83rem; }
button:focus-visible, input:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
@media (max-width: 720px) { .workspace { grid-template-columns: 1fr; } .sidebar { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; } .control-section + .control-section, .readout { margin-top: 0; padding-top: 0; border-top: 0; } .readout { align-content: start; } }
@media (max-width: 480px) { .app-shell { width: min(100% - 22px, 1180px); padding: 20px 0; } header, .sidebar { display: grid; grid-template-columns: 1fr; } header { align-items: start; } .button { justify-self: start; } .sidebar { gap: 20px; } .control-section + .control-section, .readout { border-top: 1px solid var(--line); padding-top: 18px; } }