:root {
  --bg: #04050b;
  --panel: rgba(12, 14, 28, 0.86);
  --panel-border: rgba(120, 140, 255, 0.18);
  --text: #dfe4ff;
  --muted: #8f97c0;
  --accent: #7d95ff;
  --accent-strong: #a9b8ff;
  --button: rgba(125, 149, 255, 0.12);
  --button-hover: rgba(125, 149, 255, 0.24);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}

#view {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: grab;
}
#view.dragging { cursor: grabbing; }

.icon-button {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 3;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
  backdrop-filter: blur(8px);
}

#panel {
  position: fixed;
  top: 12px;
  right: 12px;
  bottom: 12px;
  width: 310px;
  z-index: 2;
  padding: 14px 16px 16px;
  padding-top: 56px;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  backdrop-filter: blur(10px);
  transition: transform 0.25s ease, opacity 0.25s ease;
  scrollbar-width: thin;
}
#panel.collapsed { transform: translateX(calc(100% + 24px)); opacity: 0; pointer-events: none; }

#panel header { margin: -44px 48px 8px 0; }
h1 { font-size: 17px; margin: 0; letter-spacing: 0.2px; }
.tagline { margin: 2px 0 0; color: var(--muted); font-size: 12.5px; }

section { border-top: 1px solid var(--panel-border); padding: 10px 0 6px; }
h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 1.2px; color: var(--accent-strong); margin: 0 0 8px; display: flex; justify-content: space-between; align-items: baseline; }
.hint { text-transform: none; letter-spacing: 0; color: var(--muted); font-weight: normal; font-size: 11.5px; }

.row { display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; margin-bottom: 8px; font-size: 13px; }
.row input[type=range], .row select { grid-column: 1 / -1; width: 100%; }
output { color: var(--muted); font-variant-numeric: tabular-nums; }
.check { display: flex; align-items: center; gap: 8px; margin: 5px 0; font-size: 13px; cursor: pointer; }
.check kbd { margin-left: auto; }

input[type=range] { accent-color: var(--accent); }
select {
  background: rgba(0, 0, 0, 0.35);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 5px 6px;
  font: inherit;
}

.buttons { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 4px; }
button {
  font: inherit;
  font-size: 12.5px;
  color: var(--text);
  background: var(--button);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 5px 10px;
  cursor: pointer;
}
button:hover { background: var(--button-hover); }
button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.primary { background: var(--accent); color: #0a0c18; font-weight: 600; padding: 8px 22px; border: none; }
button.primary:hover { background: var(--accent-strong); }

kbd {
  font: 11px ui-monospace, SFMono-Regular, Consolas, monospace;
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--panel-border);
  color: var(--muted);
}

#matrix { display: grid; gap: 2px; margin: 0 auto 4px; max-width: 280px; user-select: none; }
#matrix .cell {
  aspect-ratio: 1;
  border-radius: 3px;
  cursor: ns-resize;
  position: relative;
  touch-action: none;
}
#matrix .cell:hover { outline: 1px solid rgba(255, 255, 255, 0.7); }
#matrix .dot { aspect-ratio: 1; border-radius: 50%; transform: scale(0.55); }
#matrix .corner { font-size: 10px; color: var(--muted); display: flex; align-items: center; justify-content: center; }

footer { border-top: 1px solid var(--panel-border); padding-top: 10px; color: var(--muted); font-size: 12px; }
footer p { margin: 4px 0; }
a { color: var(--accent-strong); }

#hud {
  position: fixed;
  left: 12px;
  bottom: 10px;
  z-index: 1;
  font: 11.5px ui-monospace, SFMono-Regular, Consolas, monospace;
  color: var(--muted);
  pointer-events: none;
  white-space: pre;
  text-shadow: 0 0 4px #000;
}

#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(20px);
  z-index: 5;
  background: var(--accent);
  color: #0a0c18;
  padding: 7px 14px;
  border-radius: 8px;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

#intro {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 16px;
  background: rgba(2, 3, 8, 0.55);
  backdrop-filter: blur(3px);
}
#intro[hidden] { display: none; }
#intro .card {
  max-width: 520px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 22px 24px;
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.6);
}
#intro h2 { font-size: 20px; text-transform: none; letter-spacing: 0; color: var(--text); line-height: 1.3; display: block; }
#intro p { color: #c4cbef; }
#intro .controls { color: var(--muted); font-size: 13px; }
#intro .error { color: #ff8a8a; }

@media (max-width: 640px) {
  #panel { left: 8px; right: 8px; top: auto; bottom: 8px; width: auto; max-height: 62vh; padding-top: 14px; }
  #panel header { margin: 0 44px 8px 0; }
  .icon-button { top: 8px; right: 8px; }
  #hud { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  #panel, #toast { transition: none; }
}