:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f3f6fb;
  color: #152033;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0%, rgba(247, 210, 178, 0.34), transparent 30rem),
    radial-gradient(circle at 92% 8%, rgba(217, 203, 238, 0.34), transparent 30rem),
    radial-gradient(circle at 52% 100%, rgba(204, 232, 207, 0.28), transparent 36rem),
    linear-gradient(160deg, #fbfcff 0%, #f3f8f5 48%, #f6f1fa 100%);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  width: min(1400px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 56px;
}

.app-header {
  max-width: 760px;
  margin-bottom: 24px;
}

.eyebrow {
  margin-bottom: 10px;
  color: #506b9d;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 4.25rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.intro {
  max-width: 680px;
  margin: 18px 0 0;
  color: #5a6880;
  font-size: 1.05rem;
  line-height: 1.65;
}

.guidance {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.guidance-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 15px 16px;
  border: 1px solid rgba(103, 123, 158, 0.18);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 10px 30px rgba(43, 62, 92, 0.06);
  backdrop-filter: blur(10px);
}

.guidance-step {
  display: grid;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 999px;
  background: #1f3f7a;
  color: white;
  font-size: 0.82rem;
  font-weight: 800;
}

.guidance-item div {
  display: grid;
  gap: 3px;
}

.guidance-item strong {
  font-size: 0.94rem;
}

.guidance-item span:not(.guidance-step) {
  color: #66758d;
  font-size: 0.86rem;
  line-height: 1.45;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}

.board-frame {
  min-width: 0;
  overflow: hidden;
  border: 1px solid rgba(69, 91, 126, 0.24);
  border-radius: 22px;
  background: #ffffff;
  box-shadow:
    0 24px 60px rgba(43, 62, 92, 0.13),
    0 2px 8px rgba(43, 62, 92, 0.06);
}

.board-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 50px;
  padding: 0 18px;
  border-bottom: 1px solid rgba(69, 91, 126, 0.14);
  background:
    linear-gradient(90deg, rgba(203, 218, 240, 0.30), rgba(204, 232, 207, 0.22), rgba(217, 203, 238, 0.28)),
    rgba(248, 250, 253, 0.96);
}

.board-label {
  color: #253650;
  font-size: 0.86rem;
  font-weight: 800;
}

.board-hint {
  color: #718097;
  font-size: 0.78rem;
  font-weight: 600;
}

.board-scroll {
  overflow: auto;
  background:
    linear-gradient(rgba(89, 104, 126, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(89, 104, 126, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 16% 14%, rgba(203, 218, 240, 0.46), transparent 30rem),
    radial-gradient(circle at 78% 22%, rgba(217, 203, 238, 0.38), transparent 32rem),
    radial-gradient(circle at 54% 86%, rgba(204, 232, 207, 0.38), transparent 34rem),
    linear-gradient(145deg, #fbfdff 0%, #f3f8f5 52%, #f7f2fa 100%);
  background-size: 24px 24px, 24px 24px, auto, auto, auto, auto;
}

#board {
  position: relative;
  width: 900px;
  height: 900px;
  min-width: 900px;
  min-height: 900px;
}

#board svg .seat-marker {
  fill: #d7dce2 !important;
  stroke: #bcc4cd !important;
  stroke-width: 1 !important;
  opacity: 0.48 !important;
  transition: opacity 120ms ease, fill 120ms ease, stroke 120ms ease;
}

#board svg .seat-marker:hover {
  fill: #c9d0d8 !important;
  stroke: #aeb8c3 !important;
  opacity: 0.76 !important;
}

.control-panel {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid rgba(69, 91, 126, 0.18);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 18px 44px rgba(43, 62, 92, 0.09);
  backdrop-filter: blur(12px);
}

.control-section {
  display: grid;
  gap: 8px;
}

.control-section + .control-section {
  padding-top: 14px;
  border-top: 1px solid rgba(69, 91, 126, 0.12);
}

.control-panel h2 {
  margin: 0 0 2px;
  font-size: 0.96rem;
  letter-spacing: -0.01em;
}

.control-panel label,
.colour-fieldset legend {
  color: #52637d;
  font-size: 0.78rem;
  font-weight: 750;
}

.control-panel input,
.control-panel select {
  width: 100%;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid #cdd7e6;
  border-radius: 11px;
  outline: none;
  background: #fbfcfe;
  color: #1c2b42;
  transition: border-color 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.control-panel input:focus,
.control-panel select:focus {
  border-color: #6e8ed0;
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(84, 121, 194, 0.14);
}

.legacy-editor {
  display: none !important;
}

.object-editor-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.selected-object-type {
  display: block;
  margin-bottom: 3px;
  color: #6a7a93;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.editor-hint {
  margin: 0;
  color: #718097;
  font-size: 0.78rem;
  line-height: 1.5;
}

.object-editor-fields {
  display: grid;
  gap: 8px;
}

.object-editor-fields[hidden] {
  display: none;
}

.colour-fieldset {
  margin: 4px 0 0;
  padding: 0;
  border: 0;
}

.colour-fieldset legend {
  margin-bottom: 8px;
  padding: 0;
}

.pastel-palette {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.colour-swatch {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  border: 2px solid rgba(63, 80, 108, 0.14);
  border-radius: 11px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.42), transparent 48%),
    var(--swatch-colour);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.colour-swatch:hover {
  transform: translateY(-1px) scale(1.04);
  border-color: rgba(63, 80, 108, 0.35);
}

.colour-swatch:focus-visible {
  outline: 3px solid rgba(84, 121, 194, 0.28);
  outline-offset: 2px;
}

.colour-swatch.is-selected {
  border-color: #304d7d;
  box-shadow: 0 0 0 2px #ffffff, 0 0 0 4px #304d7d;
}

.debug-output {
  margin: 0;
  max-height: 180px;
  overflow: auto;
  padding: 10px 12px;
  border: 1px solid rgba(69, 91, 126, 0.14);
  border-radius: 10px;
  background: #f6f8fb;
  color: #66758d;
  font: 0.72rem/1.45 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

@media (max-width: 1000px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .control-panel {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .control-section + .control-section {
    padding-top: 0;
    padding-left: 14px;
    border-top: 0;
    border-left: 1px solid rgba(69, 91, 126, 0.12);
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 20px, 1400px);
    padding-top: 28px;
  }

  .guidance {
    grid-template-columns: 1fr;
  }

  .control-panel {
    grid-template-columns: 1fr;
  }

  .control-section + .control-section {
    padding-top: 14px;
    padding-left: 0;
    border-top: 1px solid rgba(69, 91, 126, 0.12);
    border-left: 0;
  }
}