* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #1c2530;
  background: #eef1f4;
}

body {
  margin: 0 auto;
  padding: 0 16px 32px;
  max-width: 1120px;
}

h1 {
  font-size: 1.7rem;
  line-height: 1.2;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.2rem;
  margin: 0 0 8px;
}

h3 {
  font-size: 1rem;
  margin: 16px 0 4px;
}

p {
  margin: 0 0 10px;
}

ul {
  margin: 0 0 10px;
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: #e6eaef;
  padding: 1px 4px;
  border-radius: 3px;
  overflow-wrap: anywhere;
}

.top {
  padding: 28px 0 12px;
}

.lead {
  max-width: 760px;
  color: #3a4756;
}

noscript {
  display: block;
  margin: 0 0 16px;
  padding: 12px 16px;
  background: #fff4d6;
  border: 1px solid #d9b441;
  border-radius: 8px;
}

.panel {
  background: #ffffff;
  border: 1px solid #d5dbe2;
  border-radius: 10px;
  padding: 18px;
  margin: 0 0 16px;
}

.step {
  margin: 0 0 2px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #5b6877;
}

.work {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 16px;
  align-items: start;
}

.picker {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.model {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  background: #f7f9fb;
  border: 2px solid #d5dbe2;
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
}

.model:hover {
  border-color: #8aa5c4;
}

.model[aria-pressed="true"] {
  border-color: #1f5fae;
  background: #eaf2fc;
}

.model-name {
  display: block;
  font-weight: 600;
  margin-bottom: 4px;
}

.model-desc {
  display: block;
  margin-top: 6px;
  font-size: 0.86rem;
  color: #46525f;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 10px;
  background: #e3e7ec;
  color: #4a5562;
}

.badge.free,
.badge.open {
  background: #d9f0e0;
  color: #17603a;
}

.params {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 14px;
  margin-top: 12px;
}

.field label,
.unlock-form label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 3px;
}

input {
  font: inherit;
  color: inherit;
  width: 100%;
  padding: 7px 9px;
  border: 1px solid #aab4c0;
  border-radius: 6px;
  background: #ffffff;
}

input:focus,
button:focus-visible,
canvas:focus-visible,
a:focus-visible {
  outline: 3px solid #7fb0ea;
  outline-offset: 1px;
}

.help {
  margin: 3px 0 0;
  font-size: 0.78rem;
  color: #5b6877;
}

.locked {
  margin-top: 12px;
  padding: 14px;
  background: #f7f4ea;
  border: 1px solid #e0d6b4;
  border-radius: 8px;
}

.locked p:last-child {
  margin-bottom: 0;
}

.notes {
  margin-top: 16px;
  font-size: 0.9rem;
}

.stage {
  border: 1px solid #d5dbe2;
  border-radius: 8px;
  overflow: hidden;
  background: #f4f6f8;
}

.stage.stale canvas {
  opacity: 0.35;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  cursor: grab;
  touch-action: none;
}

canvas:active {
  cursor: grabbing;
}

.hint {
  font-size: 0.82rem;
  color: #5b6877;
  margin-top: 8px;
}

.status {
  min-height: 1.5em;
  font-size: 0.92rem;
  color: #17603a;
}

.status.error {
  color: #a32121;
  font-weight: 600;
}

.readout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0 0 14px;
}

.readout div {
  background: #f7f9fb;
  border: 1px solid #e1e6eb;
  border-radius: 6px;
  padding: 8px 10px;
}

.readout dt {
  font-size: 0.76rem;
  color: #5b6877;
}

.readout dd {
  margin: 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

button {
  font: inherit;
  cursor: pointer;
}

button.primary,
.button-link,
.buy,
#unlock-btn,
#goto-unlock {
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid #184c8c;
  border-radius: 6px;
  background: #1f5fae;
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
}

button.primary:hover,
.button-link:hover,
#unlock-btn:hover,
#goto-unlock:hover {
  background: #184c8c;
}

.buy {
  border-color: #124d2e;
  background: #17603a;
}

.buy:hover {
  background: #124d2e;
}

.offer .buy,
.buy-note .buy {
  margin: 4px 6px;
  padding: 5px 14px;
}

.offer {
  max-width: 760px;
  font-weight: 600;
}

button:disabled,
button.primary:disabled {
  background: #c3cad2;
  border-color: #b3bbc4;
  color: #f4f6f8;
  cursor: not-allowed;
}

button.small {
  padding: 2px 10px;
  border: 1px solid #aab4c0;
  border-radius: 6px;
  background: #ffffff;
  color: #1c2530;
  font-size: 0.82rem;
}

#locked-buy .buy {
  margin-left: 8px;
}

.unlock-form {
  max-width: 560px;
  margin-top: 6px;
}

.row {
  display: flex;
  gap: 8px;
}

.row input {
  flex: 1 1 auto;
  min-width: 0;
}

.foot {
  font-size: 0.82rem;
  color: #5b6877;
  text-align: center;
  padding-top: 8px;
}

.crumbs {
  font-size: 0.86rem;
  margin: 0 0 8px;
}

.drawing {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  margin: 0 0 8px;
}

.drawing text {
  font-size: 13px;
  fill: #1c2530;
}

.spec {
  border-collapse: collapse;
  width: 100%;
  max-width: 680px;
  margin: 0 0 12px;
  font-size: 0.92rem;
}

.spec th,
.spec td {
  text-align: left;
  padding: 6px 10px;
  border-bottom: 1px solid #e1e6eb;
}

.spec td:last-child {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.partlist li {
  margin-bottom: 8px;
}

.notfound {
  max-width: 560px;
  margin: 64px auto;
  text-align: center;
}

@media (max-width: 860px) {
  .work {
    grid-template-columns: minmax(0, 1fr);
  }

  .picker {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .picker,
  .params,
  .readout {
    grid-template-columns: minmax(0, 1fr);
  }

  h1 {
    font-size: 1.4rem;
  }
}