:root {
  color-scheme: dark;
  --bg: #06111f;
  --panel: rgba(8, 19, 34, 0.82);
  --line: rgba(154, 210, 255, 0.18);
  --accent: #78ffd6;
  --accent-strong: #ffe183;
  --text: #f4f3ee;
  --text-dim: #a7bed3;
  --danger: #ff8f8f;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.46);
  --radius: 24px;
  --mono: "Consolas", "SFMono-Regular", monospace;
  --sans: "Segoe UI Variable Display", "Trebuchet MS", "Gill Sans", sans-serif;
  --serif: "Palatino Linotype", "Book Antiqua", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at 18% 18%, rgba(112, 255, 214, 0.14), transparent 22%),
    radial-gradient(circle at 85% 12%, rgba(255, 196, 108, 0.14), transparent 24%),
    radial-gradient(circle at 55% 82%, rgba(101, 163, 255, 0.16), transparent 26%),
    linear-gradient(160deg, #030913 0%, #071727 46%, #040812 100%);
  color: var(--text);
  font-family: var(--sans);
  overflow: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 85%);
  pointer-events: none;
  opacity: 0.28;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 18px;
  height: 100vh;
  padding: 18px;
}

.viewer-panel,
.control-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.viewer-panel {
  position: relative;
  min-width: 0;
  background:
    radial-gradient(circle at 25% 25%, rgba(120, 255, 214, 0.05), transparent 28%),
    radial-gradient(circle at 78% 16%, rgba(255, 225, 131, 0.08), transparent 24%),
    rgba(3, 9, 19, 0.72);
  isolation: isolate;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  background: #01040a;
}

canvas.dragging {
  cursor: grabbing;
}

.hud {
  position: absolute;
  inset: 18px 18px auto 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  pointer-events: none;
  z-index: 2;
}

.hud-card {
  min-width: 180px;
  padding: 14px 16px;
  border: 1px solid rgba(188, 221, 255, 0.16);
  border-radius: 18px;
  background: rgba(6, 17, 31, 0.62);
  backdrop-filter: blur(18px);
}

.hud-card h2 {
  margin: 0 0 10px;
  color: var(--accent);
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  text-transform: uppercase;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 14px;
  margin: 0;
}

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

.stats-grid dt {
  color: var(--text-dim);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stats-grid dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.95rem;
}

.help-lines {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
  color: var(--text-dim);
  font-size: 0.86rem;
  line-height: 1.35;
}

.help-lines code,
.footer-note code {
  color: var(--accent-strong);
  font-family: var(--mono);
  font-size: 0.85em;
}

.overlay-message {
  position: absolute;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(18px);
  min-width: 240px;
  max-width: min(86vw, 640px);
  padding: 12px 18px;
  border: 1px solid rgba(255, 225, 131, 0.22);
  border-radius: 999px;
  background: rgba(8, 18, 34, 0.86);
  color: var(--text);
  text-align: center;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.36);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
  z-index: 3;
}

.overlay-message.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 22px 20px 22px 22px;
  background:
    linear-gradient(180deg, rgba(8, 22, 40, 0.96), rgba(4, 12, 24, 0.96)),
    rgba(4, 12, 24, 0.96);
  overflow: auto;
}

.panel-header {
  display: grid;
  gap: 8px;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3vw, 2.35rem);
  font-weight: 600;
  line-height: 0.95;
}

.lede {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.55;
  font-size: 0.96rem;
}

.control-group {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(8, 18, 34, 0.56);
}

.group-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-size: 0.98rem;
  letter-spacing: 0.04em;
}

.group-title small {
  color: var(--text-dim);
  font-size: 0.76rem;
  font-weight: 400;
}

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

.control-row label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text);
}

.control-row output {
  font-family: var(--mono);
  color: var(--accent-strong);
  font-size: 0.82rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

select,
.pill-button,
.ghost-button,
.danger-button {
  width: 100%;
  padding: 11px 14px;
  border-radius: 14px;
  border: 1px solid rgba(188, 221, 255, 0.18);
  background: rgba(10, 24, 42, 0.84);
  color: var(--text);
}

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

.pill-button {
  background:
    linear-gradient(135deg, rgba(120, 255, 214, 0.18), rgba(255, 225, 131, 0.12)),
    rgba(10, 24, 42, 0.88);
  cursor: pointer;
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease;
}

.pill-button:hover,
.ghost-button:hover,
.danger-button:hover,
.mini-button:hover {
  transform: translateY(-1px);
  border-color: rgba(188, 221, 255, 0.34);
}

.pill-button.active {
  border-color: rgba(120, 255, 214, 0.64);
  background:
    linear-gradient(135deg, rgba(120, 255, 214, 0.34), rgba(255, 225, 131, 0.22)),
    rgba(10, 24, 42, 0.94);
  color: #fcfff8;
}

.ghost-button,
.danger-button,
.mini-button {
  cursor: pointer;
}

.danger-button {
  color: var(--danger);
}

.keyframe-list {
  display: grid;
  gap: 10px;
}

.keyframe-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid rgba(188, 221, 255, 0.14);
  border-radius: 16px;
  background: rgba(6, 15, 28, 0.92);
}

.keyframe-meta {
  min-width: 0;
  display: grid;
  gap: 4px;
}

.keyframe-name {
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.keyframe-detail {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.mini-button {
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid rgba(188, 221, 255, 0.16);
  background: rgba(10, 24, 42, 0.88);
  color: var(--text);
}

.empty-state {
  padding: 14px;
  border: 1px dashed rgba(188, 221, 255, 0.16);
  border-radius: 16px;
  color: var(--text-dim);
  line-height: 1.45;
  font-size: 0.9rem;
}

.footer-note {
  color: var(--text-dim);
  font-size: 0.84rem;
  line-height: 1.45;
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 100vh;
  }

  .viewer-panel {
    min-height: 60vh;
  }

  body {
    overflow: auto;
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: 10px;
    gap: 10px;
  }

  .control-panel {
    padding: 16px;
  }

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

  .hud {
    inset: 12px 12px auto 12px;
  }

  .hud-card {
    width: 100%;
  }
}