:root {
  color-scheme: light;
  --paper: #f4f2ec;
  --panel: #fbfaf6;
  --panel-strong: #ffffff;
  --ink: #1c1c1a;
  --muted: #706d66;
  --line: #d8d3c8;
  --accent: #5c6670;
  --accent-soft: #d8dee1;
  --danger: #a9694f;
  --canvas: #f8f7f1;
  --shadow: rgba(28, 28, 26, 0.07);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--paper);
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--ink);
  min-height: 38px;
  border-radius: 6px;
  padding: 0 14px;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button.primary,
#launchButton {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 28px clamp(16px, 4vw, 44px) 18px;
  border-bottom: 1px solid var(--line);
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.2rem, 7vw, 5.2rem);
  line-height: 0.9;
  font-weight: 620;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(1.2rem, 2.4vw, 1.8rem);
  font-weight: 590;
}

h3 {
  font-size: 1rem;
  font-weight: 620;
}

.eyebrow {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.button-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.layout {
  display: grid;
  grid-template-columns: minmax(330px, 0.86fr) minmax(420px, 1.14fr);
  gap: 18px;
  padding: 18px clamp(16px, 4vw, 44px) 34px;
}

.studio-panel,
.tunnel-panel {
  min-width: 0;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin: 0 0 14px;
}

.section-heading.compact {
  align-items: center;
  margin-top: 18px;
}

.preview-shell,
.flight-shell {
  border: 1px solid var(--line);
  background: var(--canvas);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 0 var(--shadow);
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
}

.fold-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.fold-card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 8px;
  padding: 12px;
}

.fold-card h3 {
  margin-bottom: 8px;
}

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

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

.choice-button {
  min-height: 42px;
  padding: 6px 9px;
  color: var(--muted);
  background: var(--panel-strong);
  overflow-wrap: anywhere;
}

.choice-button.active {
  color: var(--ink);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.sequence-block {
  margin-top: 12px;
}

.sequence-list {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.sequence-item {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  padding: 8px 10px;
  cursor: grab;
}

.sequence-item.dragging {
  opacity: 0.45;
}

.sequence-index {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.84rem;
}

.sequence-label {
  min-width: 0;
}

.sequence-label strong {
  display: block;
  font-size: 0.92rem;
}

.sequence-label span {
  color: var(--muted);
  font-size: 0.78rem;
}

.handle {
  color: var(--muted);
  font-family: var(--mono);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 12px;
  min-width: 0;
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  margin-bottom: 5px;
}

.stat strong {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1rem, 2vw, 1.24rem);
  font-weight: 650;
  overflow-wrap: anywhere;
}