:root {
  --bg: #12110f;
  --ink: #f4efe6;
  --muted: #a39b90;
  --line: rgba(244, 239, 230, 0.14);
  --accent: #ef5b32;
  --gold: #f0c38a;
  --panel: rgba(255, 255, 255, 0.03);
  --track: rgba(244, 239, 230, 0.18);
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  --sans: "Avenir Next", "Segoe UI", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1000px 420px at 0% -10%, rgba(239, 91, 50, 0.09), transparent 55%),
    radial-gradient(800px 380px at 100% 0%, rgba(240, 195, 138, 0.07), transparent 50%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.45;
}

button, input, select { font: inherit; color: inherit; }

.shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 20px 72px;
}

.top {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.brand {
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
}

.brand:hover { color: var(--gold); }

.sep {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--muted);
}

.eyebrow {
  margin: 28px 0 0;
  color: var(--gold);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 22px;
  margin-top: 6px;
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.1rem, 4vw, 3.3rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.lede {
  margin: 0;
  color: var(--muted);
  max-width: 28rem;
}

.tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 22px;
}

.tools a {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
}

.tools a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
  border-color: transparent;
}

.app {
  display: grid;
  gap: 22px;
}

.stage { min-width: 0; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 16px 18px;
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.drop {
  appearance: none;
  display: block;
  width: 100%;
  border: 1.5px dashed rgba(244, 239, 230, 0.28);
  background: rgba(255, 255, 255, 0.02);
  border-radius: 18px;
  padding: 42px 18px;
  text-align: center;
  cursor: pointer;
}

.drop.is-loaded {
  padding: 12px 14px;
  margin-bottom: 14px;
  border-radius: 12px;
}

.drop.is-loaded .hints,
.drop.is-loaded .drop-kicker { display: none; }

.drop.is-hot {
  border-color: var(--accent);
  background: rgba(239, 91, 50, 0.08);
}

.drop-kicker {
  display: block;
  color: var(--gold);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.drop-title {
  display: block;
  margin-top: 4px;
  font-family: var(--serif);
  font-size: 1.7rem;
}

.drop.is-loaded .drop-title {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.95rem;
}

.hints {
  display: block;
  margin-top: 6px;
  color: var(--muted);
}

.boards {
  display: grid;
  gap: 18px;
}

figure { margin: 0; min-width: 0; }

figcaption {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

#status { color: var(--gold); letter-spacing: 0.08em; }

.frame {
  display: inline-block;
  max-width: 100%;
  background: #0b0b0a;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  line-height: 0;
  cursor: zoom-in;
}

.frame canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.study {
  position: relative;
  width: fit-content;
  max-width: 100%;
  line-height: 0;
}

.study .grid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  pointer-events: none;
}

.frame:fullscreen,
.frame:-webkit-full-screen,
.frame.is-expanded {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  max-width: none;
  margin: 0;
  padding: 28px 28px 52px;
  background: #070706;
  border: 0;
  border-radius: 0;
  cursor: zoom-out;
}

.frame:fullscreen::after,
.frame:-webkit-full-screen::after,
.frame.is-expanded::after {
  content: "Esc to close";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 16px;
  color: rgba(244, 239, 230, 0.55);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
  pointer-events: none;
}

.frame:fullscreen > canvas,
.frame:-webkit-full-screen > canvas,
.frame.is-expanded > canvas {
  width: min(100%, calc((100vh - 80px) * var(--ratio, 1)));
  height: auto;
  max-width: none;
  max-height: calc(100vh - 80px);
}

.frame:fullscreen .study,
.frame:-webkit-full-screen .study,
.frame.is-expanded .study {
  width: min(100%, calc((100vh - 80px) * var(--ratio, 1)));
  max-width: 100%;
  max-height: calc(100vh - 80px);
}

.frame:fullscreen .study > canvas:not(.grid),
.frame:-webkit-full-screen .study > canvas:not(.grid),
.frame.is-expanded .study > canvas:not(.grid) {
  width: 100%;
  height: auto;
  max-width: none;
  max-height: none;
}

body.has-expanded { overflow: hidden; }

.meter {
  height: 2px;
  margin-top: 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 99px;
  overflow: hidden;
}

.meter span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
}

.info {
  min-height: 1.2em;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.error {
  margin: 12px 0 0;
  padding: 10px 12px;
  color: #ffb1a3;
  background: rgba(239, 91, 50, 0.12);
  border-radius: 10px;
}

.field { margin: 0 0 14px; }

.field-top, .select-field {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 6px;
}

label, legend { font-size: 0.95rem; }

output {
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  font-size: 0.88rem;
}

.hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

input[type="range"] {
  --pct: 50%;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent) var(--pct), var(--track) var(--pct));
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -7px;
  border: 0;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.45);
}

input[type="range"]::-moz-range-track {
  height: 2px;
  border: 0;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent) var(--pct), var(--track) var(--pct));
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 0;
  border-radius: 50%;
  background: var(--ink);
}

.mode {
  border: 0;
  margin: 4px 0 16px;
  padding: 0;
}

.mode legend { margin-bottom: 8px; }

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: #0e0d0c;
  border: 1px solid var(--line);
}

.segmented label { position: relative; }

.segmented input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
}

.segmented input:focus-visible { outline: none; }

.segmented span {
  display: block;
  text-align: center;
  padding: 8px 8px;
  border-radius: 999px;
  color: var(--muted);
  cursor: pointer;
}

.segmented input:checked + span {
  background: var(--ink);
  color: #171512;
  font-weight: 600;
}

.segmented input:focus-visible + span {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.split {
  display: grid;
  grid-template-columns: 1.45fr 0.8fr;
  gap: 10px;
}

.select-field { display: block; }

.select-field span {
  display: block;
  margin-bottom: 6px;
}

select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0e0d0c url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='none' stroke='%23a39b90' stroke-width='1.4' d='M1 1.2 L6 6.2 L11 1.2'/%3E%3C/svg%3E") no-repeat right 12px center;
  padding: 10px 32px 10px 12px;
  appearance: none;
}

select:disabled { opacity: 0.45; }

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.check input { accent-color: var(--accent); width: 16px; height: 16px; }

.actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 16px;
}

.save {
  appearance: none;
  width: 100%;
  border: 0;
  border-radius: 999px;
  padding: 12px 16px;
  background: var(--accent);
  color: white;
  font-weight: 600;
  cursor: pointer;
}

.save:hover:not(:disabled) { background: #ff6a42; }

.save:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.reset {
  appearance: none;
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
  padding: 8px;
}

.reset:hover { color: var(--ink); }

details {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

summary {
  cursor: pointer;
  color: var(--ink);
  margin-bottom: 8px;
}

details ol, details ul { margin: 0.4rem 0 0.8rem; padding-left: 1.15rem; }

details li { margin: 0.28rem 0; }

.foot {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

@media (min-width: 900px) {
  .app {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: start;
  }

  .stage { grid-column: 2; grid-row: 1; }
  .panel { grid-column: 1; grid-row: 1; position: sticky; top: 16px; }
}

@media (min-width: 1100px) {
  .boards { grid-template-columns: 1fr 1fr; align-items: start; }
}

@media (max-width: 560px) {
  .split { grid-template-columns: 1fr; }
  .drop-title { font-size: 1.45rem; }
}