:root {
  --paper: #f6f5f0;
  --card: #ffffff;
  --ink: #171a1c;
  --muted: #5c6469;
  --line: #dcd9cf;
  --accent: #0f766e;
  --accent-soft: #d9f0eb;
  --warn: #b42318;
  --radius: 14px;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:hover { text-decoration: none; }

.site-head {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(246, 245, 240, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font: 700 20px/1 var(--mono);
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.brand .dot { color: var(--accent); }

.site-head nav { display: flex; gap: 18px; margin-left: auto; }
.site-head nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.site-head nav a:hover { color: var(--ink); }

.badge {
  font: 500 12px/1 var(--mono);
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 7px 11px;
  white-space: nowrap;
}

main { max-width: 1120px; margin: 0 auto; padding: 0 24px 80px; }

.hero { padding: 56px 0 28px; max-width: 760px; }
.hero h1 { font-size: clamp(34px, 5vw, 54px); line-height: 1.05; letter-spacing: -1.5px; margin: 0 0 14px; }
.lede { font-size: 18px; color: var(--muted); margin: 0; }

.tool {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03), 0 18px 40px -30px rgba(0, 0, 0, 0.35);
}

.empty { padding: 26px 10px 10px; }

.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 220px;
  border: 2px dashed var(--line);
  border-radius: 12px;
  cursor: pointer;
  text-align: center;
  padding: 24px;
  transition: border-color 0.15s, background 0.15s;
}
.drop strong { font-size: 18px; }
.drop span { color: var(--muted); font-size: 14px; }
.drop.over, .drop:focus-visible { border-color: var(--accent); background: var(--accent-soft); outline: none; }

.samples { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 16px; font-size: 14px; color: var(--muted); }

button {
  font: 500 14px/1 var(--sans);
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 9px;
  padding: 10px 14px;
  cursor: pointer;
}
button:hover { border-color: #b9b5a8; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { filter: brightness(1.08); }
button.ghost { padding: 5px 9px; font-size: 12px; }
button.active { border-color: var(--accent); color: var(--accent); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.workspace { display: flex; flex-direction: column; gap: 12px; }

.modes {
  display: flex;
  gap: 4px;
  align-self: flex-start;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f0eee7;
}
.mode { border: none; background: transparent; padding: 8px 14px; border-radius: 7px; color: var(--muted); }
.mode.active { background: #fff; color: var(--ink); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08); }
.mode .tag {
  font: 600 10px var(--mono);
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 5px;
  border-radius: 4px;
  margin-left: 4px;
  vertical-align: 1px;
}

.ai-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fbfaf6;
}
.ai-line { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 12px; color: var(--muted); }
.ai-panel progress { width: 100%; height: 6px; accent-color: var(--accent); }
.controls.disabled { opacity: 0.45; pointer-events: none; }

.stage-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 16px;
  align-items: start;
}

.stage-wrap {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #e9e6dd 25%, transparent 25%),
    linear-gradient(-45deg, #e9e6dd 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e9e6dd 75%),
    linear-gradient(-45deg, transparent 75%, #e9e6dd 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stage-wrap canvas { width: min(100%, 640px); height: auto; display: block; image-rendering: auto; }
.stage-wrap.picking canvas { cursor: crosshair; }

.controls { display: flex; flex-direction: column; gap: 14px; font-size: 13px; }
.bg-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.swatch { width: 22px; height: 22px; border-radius: 6px; border: 1px solid var(--line); display: inline-block; }
.bg-row code { font: 500 12px var(--mono); color: var(--muted); }

.control { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; color: var(--muted); }
.control input[type="range"] { width: 100%; accent-color: var(--accent); }
.control output { font: 600 12px var(--mono); color: var(--ink); min-width: 22px; text-align: right; }

.check { display: flex; align-items: center; gap: 8px; color: var(--muted); }
.check input { accent-color: var(--accent); }

.field { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--muted); }
.field input { width: 96px; font: 500 12px var(--mono); padding: 7px 8px; border: 1px solid var(--line); border-radius: 7px; }

.playbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.meta { font: 500 12px var(--mono); color: var(--muted); }
.status { font-size: 13px; color: var(--muted); }
.status.error { color: var(--warn); }

.filmstrip { display: flex; gap: 6px; overflow-x: auto; padding: 6px 2px 10px; min-height: 10px; }
.thumb { padding: 0; line-height: 0; border-radius: 6px; overflow: hidden; border: 2px solid transparent; background: #eee; }
.thumb canvas { display: block; }
.thumb.active { border-color: var(--accent); }

.exports { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding-top: 4px; border-top: 1px solid var(--line); }

body.busy { cursor: progress; }

.prose { max-width: 820px; margin: 56px auto 0; }
.prose h2 { font-size: 28px; letter-spacing: -0.5px; margin: 0 0 14px; }
.prose p { color: #33383b; }
.steps { padding-left: 20px; }
.steps li { margin-bottom: 10px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 18px 0; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }

details { border-bottom: 1px solid var(--line); padding: 12px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 0; color: var(--muted); }

.related a { font-weight: 500; }

.site-foot {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  max-width: 1120px;
  margin: 0 auto;
  padding: 26px 24px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.site-foot nav { display: flex; gap: 16px; }

@media (max-width: 800px) {
  .site-head { padding: 14px 16px; gap: 12px; }
  .site-head nav { display: none; }
  main { padding: 0 16px 56px; }
  .hero { padding: 32px 0 20px; }
  .stage-row { grid-template-columns: 1fr; }
  .stage-wrap { min-height: 220px; }
  .tool { padding: 14px; }
}