:root {
  color-scheme: dark;
  --bg: #514e4b;
  --header: #22262b;
  --panel: #1f2329;
  --panel-alt: #2b3036;
  --text: #f2f4f7;
  --muted: #c0c6cf;
  --beta: #facc15;
  --button: #006c6e;
  --button-hover: #00878a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", "Roboto", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  width: 100%;
  background: var(--header);
  padding: 24px 16px;
  text-align: center;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(32px, 4vw, 46px);
  letter-spacing: 0.01em;
  line-height: 1;
  font-weight: 800;
}

.topbar h1 span {
  color: var(--beta);
  font-size: 0.45em;
  vertical-align: super;
  margin-left: 8px;
  font-weight: 700;
}

.shell {
  max-width: 1400px;
  margin: 24px auto;
  padding: 0 18px 20px;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(340px, 1fr);
  grid-template-rows: auto auto;
  gap: 16px;
}

.card {
  background: var(--panel);
  border-radius: 18px;
  padding: 16px;
}

.panel-title-row h2 {
  margin: 0;
  font-size: 20px;
}

.panel-title-row p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.canvas-wrap {
  margin-top: 12px;
}

#stage {
  width: min(100%, 980px);
  height: auto;
  aspect-ratio: 16 / 9;
  display: block;
  margin: 0 auto;
  border-radius: 16px;
}

.transport-row {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.status {
  font-size: 14px;
  color: var(--muted);
  margin-left: 4px;
}

.download-wrap {
  margin-top: 10px;
  min-height: 30px;
}


.background-controls {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 220px minmax(220px, 1fr);
  align-items: start;
  gap: 12px;
}

.background-colors,
.background-upload {
  display: grid;
  gap: 6px;
}

.background-controls label {
  font-size: 12px;
  color: var(--muted);
}

.color-pair {
  display: grid;
  grid-template-columns: 62px 62px;
  gap: 8px;
}

.background-upload input[type='file'] {
  min-width: 220px;
}


.background-upload button {
  width: fit-content;
}

.download-link {
  color: #fff;
  text-decoration: none;
  display: inline-block;
  background: #1d4ed8;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 600;
}

button,
select,
input,
textarea {
  border-radius: 10px;
  border: 0;
  background: var(--panel-alt);
  color: var(--text);
  font: inherit;
  padding: 10px 12px;
}

button {
  background: var(--button);
  color: #f3fbfc;
  font-weight: 700;
  transition: transform 120ms ease, background-color 120ms ease;
  cursor: pointer;
}

button:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

.properties-panel {
  display: grid;
  align-content: start;
  gap: 10px;
}

.properties-panel label {
  font-size: 13px;
  color: var(--muted);
}

.scene-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.grid-2 > div {
  display: grid;
  gap: 6px;
}

.timeline-panel {
  grid-column: 1 / -1;
}

.timeline-bar {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}

.scene-track {
  display: grid;
  grid-template-columns: 170px 1fr;
  align-items: center;
  gap: 10px;
}

.scene-track > strong {
  color: var(--muted);
  font-size: 12px;
}

.track-line {
  height: 24px;
  background: #121722;
  border-radius: 999px;
  position: relative;
}

.clip {
  position: absolute;
  top: 3px;
  bottom: 3px;
  border-radius: 999px;
  background: #3182ce;
}

@media (max-width: 1160px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .background-controls {
    grid-template-columns: 1fr;
  }

  .color-pair {
    grid-template-columns: 62px 62px;
  }
}