:root {
  --bg: #263238;
  --bg-alt: #1f2a30;
  --panel: #2f3d43;
  --panel-soft: #37474f;
  --ink: #eceff1;
  --muted: #b0bec5;
  --faint: #90a4ae;
  --border: #455a64;
  --accent: #80cbc4;
  --accent-2: #ffcc80;
  --danger: #ef9a9a;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.22);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--mono);
  background:
    radial-gradient(circle at top left, rgba(128, 203, 196, 0.07), transparent 32rem),
    var(--bg);
  color: var(--ink);
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.35rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.site-header h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 2.05rem);
  letter-spacing: -0.04em;
}

.site-header p {
  margin: 0.4rem 0 0;
  color: var(--muted);
}

.health {
  font-size: 0.78rem;
  color: var(--accent-2);
  white-space: nowrap;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.7rem;
  background: rgba(0, 0, 0, 0.15);
}

.layout {
  display: grid;
  grid-template-columns: 370px minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.25rem;
  max-width: 1520px;
  margin: 0 auto;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card, .result-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.card h2, .result-card h2 {
  margin: 0 0 0.8rem;
  font-size: 1.0rem;
  color: var(--accent);
  letter-spacing: -0.02em;
}

label {
  display: block;
  margin: 0.7rem 0;
  font-size: 0.82rem;
  color: var(--muted);
}

input, select, textarea {
  display: block;
  width: 100%;
  margin-top: 0.28rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.7rem;
  font: inherit;
  color: var(--ink);
  background: #1c272c;
}

input:focus, select:focus, textarea:focus {
  outline: 2px solid rgba(128, 203, 196, 0.32);
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  min-height: 96px;
  font-size: 0.78rem;
}

button {
  width: 100%;
  border: 1px solid #4db6ac;
  border-radius: 6px;
  padding: 0.68rem 0.9rem;
  margin-top: 0.4rem;
  font-weight: 700;
  color: #102022;
  background: var(--accent);
  cursor: pointer;
  font-family: var(--mono);
}

button:hover { filter: brightness(1.06); }
button:disabled { opacity: 0.55; cursor: not-allowed; }

button.secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--border);
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.note p, .small {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.builder-list {
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 0.78rem;
  max-height: 160px;
  overflow: auto;
}

.builder-list li {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.25rem 0;
  border-bottom: 1px dashed rgba(176, 190, 197, 0.16);
}

.result-header {
  text-align: center;
  margin-bottom: 0.85rem;
}

.result-header h2 { margin-bottom: 0.25rem; }

.result-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.board-stage {
  position: relative;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #111827;
}

.board-stage img {
  display: block;
  width: 100%;
  height: auto;
}

.board-stage svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
}

.click-target {
  cursor: crosshair;
}

.route-marker, .builder-marker {
  pointer-events: none;
}

.hover-marker {
  pointer-events: none;
  fill: none;
  stroke: var(--accent-2);
  stroke-width: 0.55;
  opacity: 0.9;
}

.json-block {
  margin-top: 1rem;
  color: var(--muted);
}

.json-block pre {
  overflow: auto;
  max-height: 300px;
  padding: 1rem;
  background: #111a1f;
  color: #cfd8dc;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.76rem;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .site-header { flex-direction: column; }
}


.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.checkbox-label input {
  width: auto;
  margin: 0;
}

.warning-box {
  margin: 0.7rem auto 0.85rem;
  max-width: 760px;
  border: 1px solid rgba(255, 204, 128, 0.55);
  background: rgba(255, 204, 128, 0.12);
  color: var(--accent-2);
  border-radius: 8px;
  padding: 0.65rem 0.8rem;
  font-size: 0.8rem;
  text-align: left;
  white-space: pre-line;
}

.clear-board {
  width: auto;
  min-width: 150px;
  margin: 0.85rem auto 0;
  display: inline-block;
}


.field-help {
  display: block;
  margin-top: 0.35rem;
  color: var(--faint);
  font-size: 0.72rem;
  line-height: 1.35;
}

.explain dl {
  margin: 0;
}

.explain dt {
  color: var(--accent-2);
  font-size: 0.78rem;
  margin-top: 0.75rem;
}

.explain dt:first-child {
  margin-top: 0;
}

.explain dd {
  margin: 0.22rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.45;
}

.explain code {
  color: var(--accent-2);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05rem 0.25rem;
  font-size: 0.74rem;
}

.link-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

.link-list a {
  color: var(--accent);
  text-decoration: none;
}

.link-list a:hover {
  text-decoration: underline;
}


#data-acknowledgement-card p {
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
}