/* Rattleback - one stylesheet, no framework, no web font. */
:root {
  --bg: #0a0f16; --panel: #121a25; --panel2: #0d131c; --line: #22303f;
  --ink: #dbe6f5; --dim: #92a6bd; --good: #66e2a6; --bad: #ff8f6b;
  --accent: #7fc7ff; --warn: #ffd166; --pink: #ff7aa2;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--sans);
  font-size: 15px; line-height: 1.55; -webkit-text-size-adjust: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

header.top { display: flex; gap: 16px; align-items: flex-start; justify-content: space-between;
  flex-wrap: wrap; padding: 22px 20px 12px; max-width: 1100px; margin: 0 auto; }
.brand h1 { margin: 0; font-size: 30px; letter-spacing: -0.02em; }
.brand .tag { margin: 6px 0 0; color: var(--dim); max-width: 62ch; }
#help-toggle { flex: 0 0 auto; }

main { max-width: 1100px; margin: 0 auto; padding: 0 20px 40px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; margin: 0 0 18px; }
.panel h2 { margin: 0 0 10px; font-size: 19px; }
.panel h3 { margin: 18px 0 6px; font-size: 15px; color: var(--accent); }
.note { color: var(--dim); font-size: 13px; margin: 6px 0 10px; }

.viewwrap { position: relative; }
canvas { display: block; width: 100%; height: auto; border-radius: 10px;
  background: var(--panel2); border: 1px solid var(--line); }
#trace { margin-top: 10px; }
.hud { position: absolute; left: 12px; top: 10px; font-family: var(--mono); font-size: 13px;
  color: var(--ink); background: rgba(10,15,22,0.62); border: 1px solid var(--line);
  border-radius: 8px; padding: 5px 10px; pointer-events: none; }

button, select { font: inherit; color: var(--ink); background: #1b2637; cursor: pointer;
  border: 1px solid var(--line); border-radius: 9px; padding: 8px 13px; }
button:hover, select:hover { background: #24344a; }
button:focus-visible, select:focus-visible, input:focus-visible { outline: 2px solid var(--accent);
  outline-offset: 2px; }
button.big { font-size: 16px; padding: 11px 18px; font-weight: 600; }
button.on { background: #2b425c; border-color: var(--accent); }

.controls { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 14px; }
.grp { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.grp .lbl { width: 100%; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--dim); }

.sliders { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px 20px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); }
.sliders label { display: block; font-size: 13px; color: var(--dim); }
.sliders output { color: var(--ink); font-family: var(--mono); float: right; }
.sliders input[type=range] { width: 100%; margin-top: 4px; accent-color: var(--accent); }
.sliders select { width: 100%; margin-top: 4px; }
.sliders label.chk { display: flex; align-items: center; gap: 8px; }
.sliders label.chk input { accent-color: var(--accent); }

.labgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 16px; }
table.kv { width: 100%; border-collapse: collapse; font-size: 13px; }
table.kv th { text-align: left; font-weight: 400; color: var(--dim); padding: 4px 8px 4px 0;
  border-bottom: 1px solid var(--line); white-space: nowrap; }
table.kv td.v { text-align: right; font-family: var(--mono); padding: 4px 0;
  border-bottom: 1px solid var(--line); }
table.kv td.good { color: var(--good); }
table.kv td.bad { color: var(--bad); }

blockquote#claim { margin: 0 0 12px; padding: 10px 16px; border-left: 3px solid var(--warn);
  background: var(--panel2); font-size: 17px; }
.verdict p { margin: 0 0 10px; }
p.formula { font-family: var(--mono); font-size: 13px; color: var(--warn);
  background: var(--panel2); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }

dl.findings { display: grid; grid-template-columns: minmax(200px, 2fr) minmax(120px, 3fr);
  gap: 0; margin: 0; font-size: 13px; }
dl.findings dt { color: var(--dim); padding: 5px 10px 5px 0; border-bottom: 1px solid var(--line); }
dl.findings dd { margin: 0; font-family: var(--mono); padding: 5px 0;
  border-bottom: 1px solid var(--line); word-break: break-word; }

.help ul { margin: 6px 0 10px; padding-left: 20px; }
.help li { margin: 4px 0; }
.help pre.tm { font-family: var(--mono); font-size: 12px; background: var(--panel2);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; overflow-x: auto; }
.help code { font-family: var(--mono); font-size: 12.5px; background: var(--panel2);
  border-radius: 4px; padding: 1px 4px; }
.help p.warn { border-left: 3px solid var(--bad); padding: 8px 14px; background: var(--panel2);
  border-radius: 0 8px 8px 0; }
ul.src li { color: var(--dim); }
ul.src em { color: var(--ink); }

footer { max-width: 1100px; margin: 0 auto; padding: 0 20px 40px; color: var(--dim); font-size: 13px; }
footer a { color: var(--accent); }

@media (max-width: 640px) {
  .brand h1 { font-size: 24px; }
  .panel { padding: 13px 13px; }
  button.big { font-size: 15px; padding: 10px 14px; }
  dl.findings { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  dl.findings dd { overflow-wrap: anywhere; }
  .help p code, .help li code { overflow-wrap: anywhere; }
}