:root {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #111;
  background-color: #f4f6fb;
}

* {
  box-sizing: border-box;
}

:root {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #111;
  background-color: #f4f6fb;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 0.6rem clamp(1rem, 3vw, 2.5rem);
  background: #fff;
  border-bottom: 1px solid #e1e5f0;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.06);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: flex-start;
}

label {
  font-weight: 600;
  font-size: 0.9rem;
  color: #1f2937;
}

.control {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.control input[type="number"] {
  width: 4.5rem;
  padding: 0.35rem 0.4rem;
}

.control-toggle input[type="checkbox"] {
  margin-left: 0.25rem;
}

#fullscreenToggle.canvas-control,
#replayBtn.canvas-control {
  position: absolute;
  top: 1rem;
  z-index: 10;
  border: none;
  background: rgba(15, 23, 42, 0.75);
  color: #fff;
  font-size: 0.85rem;
  padding: 0.45rem 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s ease;
  display: none;
}

#fullscreenToggle.canvas-control:hover,
#replayBtn.canvas-control:hover {
  background: rgba(15, 23, 42, 0.9);
}

#fullscreenToggle.canvas-control[aria-pressed="true"] {
  background: rgba(99, 102, 241, 0.9);
}

#replayBtn.canvas-control {
  display: none;
}

#fullscreenToggle.canvas-control.left {
  left: 1rem;
}

#replayBtn.canvas-control.right {
  right: 1rem;
}

input {
  margin-top: 0.35rem;
  padding: 0.4rem 0.6rem;
  font-size: 1rem;
  border-radius: 6px;
  border: 1px solid #cbd5f5;
  min-width: 6ch;
}

button {
  border: none;
  background: #111827;
  color: #fff;
  font-size: 0.95rem;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 0.5rem 1rem 0.75rem;
  gap: 0.75rem;
  min-height: 0;
}

#canvasContainer {
  flex: 1;
  width: 100%;
  position: relative;
  background: #fff;
  border: none;
  border-radius: 0;
  display: flex;
  align-items: stretch;
  justify-content: center;
  overflow: hidden;
  min-height: 0;
}

canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

#status {
  font-size: 0.95rem;
  color: #374151;
  min-height: 1.4rem;
  margin-top: 0.5rem;
}

.hint {
  font-size: 0.9rem;
  color: #6b7280;
  margin-top: 0.5rem;
}