:root {
  color-scheme: light;
  --ink: #1f2924;
  --muted: #66716b;
  --line: #cfd7d2;
  --surface: #ffffff;
  --surface-subtle: #f2f4f2;
  --toolbar: #e4e8e5;
  --green: #236b4d;
  --green-dark: #184d38;
  --green-soft: #dcebe3;
  --amber: #a5620c;
  --danger: #a43b35;
  --focus: #0b6bcb;
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 1280px;
  min-height: 720px;
  margin: 0;
}

body {
  overflow: auto;
  color: var(--ink);
  background: #d9dedb;
}

button,
input {
  font: inherit;
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: -3px;
}

.demo-shell {
  display: grid;
  width: 100vw;
  min-width: 1280px;
  height: 100vh;
  min-height: 720px;
  grid-template-rows: 52px minmax(0, 1fr) 58px;
  overflow: hidden;
  background: var(--surface);
}

.demo-toolbar,
.playback-toolbar {
  position: relative;
  z-index: 30;
  display: grid;
  min-width: 0;
  align-items: stretch;
  border-color: var(--line);
  background: var(--toolbar);
}

.demo-toolbar {
  grid-template-columns: 96px 232px minmax(360px, 1fr) 110px 96px;
  border-bottom: 1px solid var(--line);
}

.playback-toolbar {
  grid-template-columns: 96px minmax(0, 1fr) 96px;
  border-top: 1px solid var(--line);
}

.toolbar-buttons {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 48px;
}

.icon-button {
  display: inline-grid;
  width: 48px;
  min-width: 48px;
  height: 100%;
  min-height: 44px;
  place-items: center;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--ink);
  background: transparent;
  cursor: pointer;
}

.toolbar-buttons--right .icon-button {
  border-right: 0;
  border-left: 1px solid var(--line);
}

.icon-button:hover:not(:disabled) {
  color: var(--green-dark);
  background: var(--green-soft);
}

.icon-button:disabled {
  color: #9ca59f;
  cursor: not-allowed;
}

.demo-identity {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  padding: 0 14px;
  border-left: 1px solid var(--line);
}

.demo-identity__product {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
}

.demo-identity h1 {
  margin: 2px 0 0;
  overflow: hidden;
  font-size: 15px;
  font-weight: 680;
  letter-spacing: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.range-control {
  display: grid;
  min-width: 0;
  grid-template-columns: auto minmax(120px, 1fr) 72px;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
}

.range-control label,
.range-control output {
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.range-control output {
  color: var(--ink);
  text-align: right;
}

input[type="range"] {
  width: 100%;
  height: 32px;
  margin: 0;
  accent-color: var(--green);
  cursor: pointer;
}

input[type="range"]:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.runtime-status {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.runtime-status::before {
  width: 7px;
  height: 7px;
  margin-right: 7px;
  border-radius: 50%;
  background: var(--amber);
  content: "";
}

[data-demo-state="ready"] .runtime-status::before {
  background: var(--green);
}

[data-demo-state="error"] .runtime-status::before {
  background: var(--danger);
}

.demo-workspace {
  display: grid;
  min-width: 0;
  min-height: 0;
  grid-template-columns: minmax(0, 55fr) minmax(0, 45fr);
  overflow: hidden;
}

.visual-pane,
.source-pane {
  min-width: 0;
  min-height: 0;
}

.visual-pane {
  display: grid;
  grid-template-rows: minmax(0, 1fr) minmax(112px, 20%);
  background: var(--surface);
}

.scene {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--surface);
}

.scene > svg:not(.explain) {
  display: block;
  width: 100%;
  height: 100%;
}

.scene .explain {
  position: absolute;
  top: 18px;
  left: 24px;
  display: block;
}

.scene .explain .outline {
  fill: rgba(255, 255, 255, 0.94);
}

.scene-status {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.9);
  font-size: 14px;
}

.scene-status[hidden] {
  display: none;
}

.scene-status--error {
  padding: 32px;
  color: var(--danger);
  text-align: center;
}

.narration-panel {
  min-width: 0;
  min-height: 0;
  padding: 10px 20px;
  overflow: auto;
  border-top: 2px solid var(--ink);
  background: var(--surface-subtle);
}

.narration-panel ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.narration-panel li {
  margin: 0 0 4px;
  color: #39443e;
  font-size: 13px;
  line-height: 1.45;
}

.narration-panel li:last-child {
  color: var(--ink);
  font-weight: 620;
}

.source-pane {
  position: relative;
  border-left: 1px solid #183b40;
  background: #002b36;
}

.source-pane > #source-editor {
  position: absolute;
  inset: 0;
  font-size: 18px;
}

.demo-active-line {
  position: absolute;
  z-index: 5;
  background: rgba(67, 157, 99, 0.38);
}

.frame-control {
  grid-template-columns: 44px minmax(160px, 1fr) 96px;
  gap: 14px;
  padding-inline: 18px;
}

.frame-control__label {
  color: var(--muted);
  font-size: 12px;
}

dialog {
  width: min(520px, calc(100vw - 80px));
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--surface);
  box-shadow: 0 18px 55px rgba(21, 31, 25, 0.28);
}

dialog::backdrop {
  background: rgba(20, 28, 24, 0.56);
}

.dialog-header {
  display: flex;
  min-height: 52px;
  align-items: center;
  justify-content: space-between;
  padding-left: 20px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-subtle);
}

.dialog-header h2 {
  margin: 0;
  font-size: 17px;
  letter-spacing: 0;
}

.dialog-body {
  padding: 20px 24px 24px;
  font-size: 14px;
  line-height: 1.65;
}

.dialog-body ul {
  margin: 8px 0 0;
  padding-left: 22px;
}

.dialog-close {
  border-left: 1px solid var(--line);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  :root {
    --line: #7f8983;
    --muted: #3e4842;
  }
}