* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-body: #1a1a2e;
  --bg-panel: #16213e;
  --bg-section: #0f3460;
  --bg-status: #0a1128;
  --border-strong: #0f3460;
  --text-main: #e0e0e0;
  --text-accent: #a0c4ff;
  --text-muted: #7986cb;
  --heading-accent: #e94560;
  --canvas-bg: #0d1b2a;
  --button-transition: background 0.15s, transform 0.1s, box-shadow 0.15s, outline-color 0.15s;
  --button-transition-reduced: background 0.15s, box-shadow 0.15s, outline-color 0.15s, transform 0s;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg-body);
  color: var(--text-main);
  display: flex;
  height: 100vh;
  overflow: hidden;
}

#controls {
  width: 260px;
  min-width: 260px;
  background: var(--bg-panel);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  border-right: 2px solid var(--border-strong);
}

#controls h2 {
  color: var(--heading-accent);
  font-size: 1.1rem;
  text-align: center;
  margin-bottom: 4px;
}

.section {
  background: var(--bg-section);
  border-radius: 8px;
  padding: 10px 12px;
}

.section h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-accent);
  margin-bottom: 8px;
}

.btn-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.button-row {
  display: flex;
  gap: 6px;
}

.button-row > * {
  flex: 1;
}

button,
select {
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
}

button {
  cursor: pointer;
  transition: var(--button-transition);
}

button:active { transform: scale(0.97); }

button.active {
  transform: scale(1.01);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.35), 0 0 18px var(--active-glow, rgba(255, 255, 255, 0.55));
  outline: 3px solid var(--active-outline, #fff);
  outline-offset: 1px;
  filter: brightness(1.12);
}

select {
  width: 100%;
  background: #102544;
  color: var(--text-main);
  cursor: pointer;
}

.btn-add    { background: #4caf50; color: #fff; --active-outline: #c8e6c9; --active-glow: rgba(76, 175, 80, 0.7); }
.btn-add:hover { background: #43a047; }
.btn-add.active { background: #2e7d32; }

.btn-delete { background: #e53935; color: #fff; --active-outline: #ff5252; --active-glow: rgba(229, 57, 53, 0.7); }
.btn-delete:hover { background: #c62828; }
.btn-delete.active { background: #b71c1c; }

.btn-pin    { background: #fb8c00; color: #fff; --active-outline: #ffab40; --active-glow: rgba(251, 140, 0, 0.75); }
.btn-pin:hover { background: #e65100; }
.btn-pin.active { background: #bf360c; }

.btn-spring { background: #7c4dff; color: #fff; --active-outline: #b388ff; --active-glow: rgba(124, 77, 255, 0.75); }
.btn-spring:hover { background: #6200ea; }
.btn-spring.active { background: #4a148c; }

.btn-neutral { background: #455a64; color: #fff; --active-outline: #90caf9; --active-glow: rgba(144, 202, 249, 0.65); }
.btn-neutral:hover { background: #37474f; }
.btn-neutral.active { background: #263238; }

.toggle-btn {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toggle-btn input[type=checkbox] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.toggle-btn input[type=checkbox]:focus-visible {
  outline: 2px solid var(--heading-accent);
  outline-offset: 2px;
}

label,
.control-note {
  font-size: 0.85rem;
}

.control-note {
  color: var(--text-muted);
  line-height: 1.35;
}

.slider-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
}

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

#status {
  font-size: 0.78rem;
  color: var(--text-accent);
  min-height: 32px;
  background: var(--bg-status);
  border-radius: 6px;
  padding: 6px 8px;
  line-height: 1.4;
}

#hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

#canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

canvas {
  display: block;
  background: var(--canvas-bg);
  cursor: crosshair;
}

.mt-8 { margin-top: 8px; }
.mt-10 { margin-top: 10px; }

@media (prefers-reduced-motion: reduce) {
  button {
    transition: var(--button-transition-reduced);
  }

  button:active,
  button.active {
    transform: none;
  }
}

/* --- Csoportosított vezérlőpanel ------------------------------------ */

/* A #controls oszlopos flexbox: a gyerekek alapértelmezés szerint összenyomódnának,
   ha a tartalom magasabb a panelnél. Ezt tiltjuk le, hogy inkább görgessen. */
#controls > * {
  flex-shrink: 0;
}

#controls .toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 0 -16px;
  padding: 6px 16px 10px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-strong);
}

#controls .toolbar button {
  flex: 0 0 auto;
  padding: 6px 10px;
  font-size: 0.8rem;
}

.toolbar-slider {
  flex: 1 1 110px;
  min-width: 110px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toolbar-slider .slider-label {
  font-size: 0.75rem;
  color: var(--text-accent);
}

.group {
  background: var(--bg-section);
  border-radius: 8px;
  overflow: hidden;
}

.group > summary {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-accent);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.group > summary::-webkit-details-marker { display: none; }

.group > summary::after {
  content: '\25BE';
  margin-left: auto;
  font-size: 0.9rem;
  letter-spacing: 0;
  opacity: 0.7;
  transition: transform 0.15s ease;
}

.group[open] > summary::after { transform: rotate(180deg); }

.group > summary:hover { background: rgba(160, 196, 255, 0.08); }

.group > summary:focus-visible {
  outline: 2px solid var(--heading-accent);
  outline-offset: -2px;
}

.group[open] > summary { border-bottom: 1px solid rgba(160, 196, 255, 0.12); }

.group-body { padding: 10px 12px; }

.is-hidden { display: none !important; }

.is-disabled { opacity: 0.42; }

.is-disabled input,
.is-disabled select,
.is-disabled label { cursor: not-allowed; }

#controls .toolbar .toolbar-pluck {
  flex: 1 0 100%;
}

#controls .toolbar .toolbar-pluck button {
  width: 100%;
  padding: 10px 12px;
  font-size: 0.95rem;
  background: var(--heading-accent);
  color: #fff;
  --active-outline: #ff8a9a;
  --active-glow: rgba(233, 69, 90, 0.7);
}

#controls .toolbar .toolbar-pluck button:hover {
  background: #c9304a;
}

@media (prefers-reduced-motion: reduce) {
  .group > summary::after { transition: none; }
}