:root {
  color-scheme: dark;
  --bg: #050711;
  --bg-soft: rgba(13, 19, 38, 0.82);
  --card: rgba(17, 25, 51, 0.72);
  --border: rgba(153, 190, 255, 0.16);
  --text: #eef5ff;
  --muted: #9fb0c9;
  --accent: #62e6ff;
  --accent-2: #b47cff;
  --danger: #ff6b8a;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; margin: 0; }

body {
  background:
    radial-gradient(circle at top left, rgba(98, 230, 255, 0.22), transparent 30rem),
    radial-gradient(circle at bottom right, rgba(180, 124, 255, 0.2), transparent 32rem),
    var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

button, input, select { font: inherit; }

.app-shell {
  min-height: 100vh;
  width: min(1680px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.hero-panel {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  margin-bottom: 20px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(16, 28, 58, 0.86), rgba(9, 11, 24, 0.74));
  box-shadow: 0 24px 70px rgba(0,0,0,.34);
  backdrop-filter: blur(18px);
}

.eyebrow {
  color: var(--accent);
  letter-spacing: .16em;
  text-transform: uppercase;
  font-weight: 800;
  font-size: .78rem;
  margin: 0 0 8px;
}

h1 {
  font-size: clamp(2rem, 5vw, 4.8rem);
  line-height: .95;
  margin: 0;
  letter-spacing: -0.07em;
}

.subtitle {
  color: var(--muted);
  max-width: 760px;
  font-size: clamp(1rem, 2vw, 1.18rem);
  line-height: 1.55;
  margin: 16px 0 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(105px, 1fr));
  gap: 12px;
  min-width: min(410px, 100%);
}

.stat-card {
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 16px;
}

.stat-card span {
  display: block;
  color: var(--muted);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 8px;
}

.stat-card strong { font-size: 1.38rem; }

.workspace {
  display: grid;
  grid-template-columns: minmax(320px, 410px) 1fr;
  gap: 20px;
  min-height: calc(100vh - 210px);
}

.controls-panel,
.canvas-panel {
  border: 1px solid var(--border);
  background: var(--bg-soft);
  border-radius: 28px;
  box-shadow: 0 24px 70px rgba(0,0,0,.32);
  backdrop-filter: blur(18px);
}

.controls-panel {
  overflow: hidden;
  align-self: start;
  max-height: calc(100vh - 32px);
  position: sticky;
  top: 16px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.panel-header h2 { margin: 0; font-size: 1.1rem; }

.controls-body {
  padding: 8px 18px 20px;
  overflow-y: auto;
  max-height: calc(100vh - 100px);
}

.controls-body.hidden { display: none; }

details {
  border-bottom: 1px solid rgba(153, 190, 255, 0.11);
  padding: 12px 0;
}

details:last-child { border-bottom: none; }

summary {
  cursor: pointer;
  font-weight: 800;
  color: #dceaff;
  margin-bottom: 12px;
}

.control-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 14px;
  align-items: center;
  color: var(--muted);
  font-size: .9rem;
  margin: 12px 0;
}

.control-row output {
  color: var(--text);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.control-row input[type="range"] {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0;
  color: var(--muted);
}

.toggle-row input { accent-color: var(--accent); width: 18px; height: 18px; }

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

button {
  border: 1px solid rgba(98, 230, 255, .32);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(98, 230, 255, .16), rgba(180, 124, 255, .14));
  color: var(--text);
  padding: 11px 13px;
  cursor: pointer;
  font-weight: 800;
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: rgba(98, 230, 255, .72);
  background: linear-gradient(135deg, rgba(98, 230, 255, .25), rgba(180, 124, 255, .22));
}

.ghost-button {
  padding: 8px 12px;
  color: var(--muted);
  background: rgba(255,255,255,.04);
  border-color: var(--border);
}

.canvas-panel {
  min-height: 640px;
  position: relative;
  overflow: hidden;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}

canvas:active { cursor: grabbing; }

.canvas-hint {
  position: absolute;
  left: 18px;
  bottom: 16px;
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(5, 7, 17, .68);
  color: var(--muted);
  font-size: .86rem;
  pointer-events: none;
}

@media (max-width: 1050px) {
  .hero-panel { flex-direction: column; align-items: stretch; }
  .workspace { grid-template-columns: 1fr; }
  .controls-panel { position: static; max-height: none; }
  .controls-body { max-height: none; }
  .canvas-panel { min-height: 62vh; }
}

@media (max-width: 620px) {
  .app-shell { padding: 12px; }
  .hero-panel, .controls-panel, .canvas-panel { border-radius: 20px; }
  .stats-grid { grid-template-columns: 1fr; }
  .button-grid { grid-template-columns: 1fr; }
  .canvas-hint { display: none; }
}