:root {
  --paper: #efe6d4;
  --ink: #161410;
  --rule: #161410;
  --orange: #e85d04;
  --muted: #5c564c;
  --panel: #f7f1e6;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--paper); color: var(--ink); }
body {
  font: 15px/1.45 "IBM Plex Sans", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  min-height: 100vh;
}
.mast {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 24px;
  padding: 28px 32px 12px;
  border-bottom: 3px solid var(--rule);
}
.kicker {
  margin: 0 0 4px;
  letter-spacing: 0.18em;
  font-size: 11px;
  font-weight: 700;
}
h1 {
  margin: 0;
  font-size: 42px;
  line-height: 0.92;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}
.lede { margin: 18px 0 0; max-width: 42em; color: var(--muted); }
.grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.7fr);
  gap: 0;
  min-height: calc(100vh - 140px);
}
.bay { padding: 20px 32px 40px; }
.rail {
  border-left: 3px solid var(--rule);
  padding: 20px 24px 40px;
  background: var(--panel);
}
.rail h2 {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.rail section + section { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--rule); }
.steps { margin: 0; padding: 0 0 0 18px; }
.steps li { margin: 0 0 10px; }
.hint, .meta, .status { color: var(--muted); font-size: 13px; }
.drop {
  border: 2px dashed var(--rule);
  padding: 18px;
  background: #fffdf7;
  min-height: 120px;
}
.drop.is-over { background: #ffe8d2; }
.drop strong { display: block; font-size: 18px; margin-bottom: 4px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 16px 0; }
.btn, .seg button {
  appearance: none;
  border: 2px solid var(--rule);
  background: #fffdf7;
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  padding: 8px 12px;
  cursor: pointer;
}
.btn:disabled, .seg button:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-accent { background: var(--orange); color: #fff; border-color: #9a3a00; }
.btn-ghost { font-weight: 600; }
.seg { display: inline-flex; }
.seg button { border-right-width: 0; }
.seg button:last-child { border-right-width: 2px; }
.seg button.is-on { background: var(--ink); color: var(--paper); }
.stage {
  border: 3px solid var(--rule);
  background: #111;
  padding: 0;
}
.preview {
  display: none;
  width: 100%;
  max-height: 62vh;
  object-fit: contain;
  image-rendering: auto;
}
.preview[src] { display: block; }
.preview--checker {
  background-color: #cfc6b4;
  background-image:
    linear-gradient(45deg, #9a9180 25%, transparent 25%),
    linear-gradient(-45deg, #9a9180 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #9a9180 75%),
    linear-gradient(-45deg, transparent 75%, #9a9180 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}
.preview--black { background: #0b0b0b; }
.preview--paper { background: var(--paper); }
.stage-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 8px 12px;
  background: var(--paper);
  border-top: 2px solid var(--rule);
}
#scrub { width: 100%; }
.progress {
  height: 8px;
  border: 2px solid var(--rule);
  margin-top: 12px;
  background: #fffdf7;
}
#bar { height: 100%; width: 0; background: var(--orange); }
.log {
  height: 120px;
  overflow: auto;
  background: #161410;
  color: #efe6d4;
  padding: 10px 12px;
  font: 12px/1.4 ui-monospace, "IBM Plex Mono", monospace;
  margin: 8px 0 0;
}
label {
  display: grid;
  grid-template-columns: 1fr 88px;
  gap: 8px;
  align-items: center;
  margin: 0 0 8px;
  font-size: 13px;
}
label input {
  width: 100%;
  border: 2px solid var(--rule);
  background: #fffdf7;
  padding: 4px 6px;
  font: inherit;
}
code { font-family: ui-monospace, "IBM Plex Mono", monospace; font-size: 12px; }
@media (max-width: 960px) {
  .mast, .grid { grid-template-columns: 1fr; }
  .rail { border-left: 0; border-top: 3px solid var(--rule); }
}