:root {
  color-scheme: light;
  --bg: #f4f7f6;
  --panel: #ffffff;
  --ink: #172321;
  --muted: #5d6b67;
  --line: #d9e1de;
  --field: #f9fbfa;
  --accent: #007d72;
  --accent-strong: #026057;
  --warm: #c86f2e;
  --shadow: 0 18px 45px rgba(20, 45, 41, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

.app {
  display: grid;
  grid-template-columns: minmax(360px, 0.92fr) minmax(420px, 1.08fr);
  gap: 24px;
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px;
}

.form-pane,
.preview-pane {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.form-pane {
  align-self: start;
  padding: 24px;
}

.preview-pane {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  padding: 18px;
  overflow: auto;
}

.topbar,
.preview-toolbar,
.legend-row,
.occupant-head,
.toolbar-actions {
  display: flex;
  align-items: center;
}

.topbar,
.preview-toolbar,
.legend-row {
  justify-content: space-between;
  gap: 16px;
}

.topbar {
  margin-bottom: 22px;
}

.preview-toolbar {
  margin-bottom: 16px;
}

.toolbar-actions {
  gap: 10px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(1.55rem, 2.1vw, 2.35rem);
  line-height: 1.05;
}

h2 {
  font-size: 1.24rem;
}

h3 {
  font-size: 1rem;
}

.unit-pill {
  flex: 0 0 auto;
  border: 1px solid rgba(0, 125, 114, 0.3);
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--accent-strong);
  font-weight: 800;
  background: #eef8f5;
}

fieldset {
  margin: 0 0 20px;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 12px;
  color: var(--ink);
  font-size: 0.96rem;
  font-weight: 800;
}

.legend-row legend {
  margin: 0;
}

.field-grid,
.occupant-grid {
  display: grid;
  gap: 14px;
}

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

.occupant-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.span-2 {
  grid-column: span 2;
}

input,
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 11px;
  background: var(--field);
  color: var(--ink);
  outline: none;
  transition: border-color 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

input:focus,
select:focus {
  border-color: var(--accent);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(0, 125, 114, 0.13);
}

.occupants {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.occupant {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fcfdfd;
}

.occupant-head {
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.icon-button,
.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 800;
  line-height: 1;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, color 140ms ease;
}

.icon-button {
  width: 40px;
  height: 40px;
  padding: 0;
  border-color: var(--line);
  background: #ffffff;
  color: var(--accent-strong);
  font-size: 1.45rem;
}

.primary-button {
  min-height: 40px;
  gap: 8px;
  padding: 0 14px;
  background: var(--accent);
  color: #ffffff;
  font-size: 0.9rem;
}

.icon-button:hover,
.primary-button:hover {
  transform: translateY(-1px);
}

.icon-button:hover {
  border-color: rgba(0, 125, 114, 0.45);
  background: #eef8f5;
}

.primary-button:hover {
  background: var(--accent-strong);
}

.remove-occupant {
  color: var(--warm);
}

.canvas-frame {
  display: grid;
  place-items: center;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #ecf1ef;
}

canvas {
  display: block;
  width: min(100%, 709px);
  height: auto;
  background: #ffffff;
  border-radius: 4px;
  box-shadow: 0 12px 32px rgba(15, 33, 30, 0.16);
}

@media (max-width: 1020px) {
  .app {
    grid-template-columns: 1fr;
  }

  .preview-pane {
    position: static;
    max-height: none;
  }
}

@media (max-width: 660px) {
  .app {
    padding: 12px;
  }

  .form-pane,
  .preview-pane {
    padding: 16px;
  }

  .field-grid,
  .occupant-grid {
    grid-template-columns: 1fr;
  }

  .span-2 {
    grid-column: auto;
  }

  .topbar,
  .preview-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar-actions {
    width: 100%;
  }

  .primary-button {
    flex: 1;
  }
}