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

:root {
  --bg:           #0d0d12;
  --sidebar-bg:   #16161f;
  --border:       #2a2a3a;
  --text:         #b8b8cc;
  --text-dim:     #565670;
  --text-bright:  #e4e4f2;
  --accent:       #7166f5;
  --accent-hover: #8c83ff;
  --danger:       #e05575;
  --secondary:    #222232;
  --secondary-hv: #2c2c42;
  --sidebar-w:    258px;
}

html {
  height: 100%;
}

body {
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: row;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.4;
}

/* ── Sidebar ─────────────────────────────────────────────── */
#sidebar {
  flex: 0 0 var(--sidebar-w);
  min-height: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 16px 16px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.01em;
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-content::-webkit-scrollbar { width: 3px; }
.sidebar-content::-webkit-scrollbar-thumb { background: var(--border); }

.ctrl-section {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.ctrl-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-dim);
  margin-bottom: 9px;
}

/* ── Preset grid ─────────────────────────────────────────── */
.preset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
}

.preset-btn {
  background: var(--secondary);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 6px;
  font-size: 0.79rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.preset-btn:hover { background: var(--secondary-hv); border-color: var(--accent); }
.preset-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.hint {
  margin-top: 7px;
  font-size: 0.72rem;
  color: var(--text-dim);
  text-align: center;
}

/* ── Color palette ───────────────────────────────────────── */
.color-palette {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.12s;
  flex-shrink: 0;
}
.color-swatch:hover { transform: scale(1.18); }
.color-swatch.selected { border-color: #fff; transform: scale(1.12); }

/* ── Controls ────────────────────────────────────────────── */
.ctrl-select {
  width: 100%;
  background: var(--secondary);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-bright);
  padding: 5px 8px;
  font-size: 0.82rem;
  cursor: pointer;
  margin-bottom: 2px;
}
.ctrl-select:focus { outline: 1px solid var(--accent); }

.ctrl-select-sm {
  background: var(--secondary);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-bright);
  padding: 4px 6px;
  font-size: 0.79rem;
  cursor: pointer;
  max-width: 120px;
}
.ctrl-select-sm:focus { outline: 1px solid var(--accent); }

#blueProbabilityContainer { margin-top: 8px; }

.ctrl-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 3px 0;
  margin-bottom: 6px;
}
.ctrl-row:last-child { margin-bottom: 0; }

.ctrl-row-slider {
  flex-wrap: wrap;
  gap: 5px 10px;
}
.ctrl-row-slider label { flex-shrink: 0; }
.ctrl-row-slider input[type="range"] { flex: 1; min-width: 80px; }

.ctrl-row label {
  font-size: 0.82rem;
  color: var(--text);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 5px;
}

.ctrl-number {
  width: 86px;
  background: var(--secondary);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-bright);
  padding: 4px 7px;
  font-size: 0.82rem;
  text-align: right;
}
.ctrl-number:focus { outline: 1px solid var(--accent); }

input[type="range"] {
  accent-color: var(--accent);
  cursor: pointer;
  height: 4px;
}

.val-display {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.8rem;
  min-width: 28px;
}

/* ── Toggles ─────────────────────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 4px 0;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text);
  user-select: none;
}

.toggle-row input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 30px;
  height: 17px;
  background: var(--secondary);
  border: 1px solid var(--border);
  border-radius: 9px;
  position: relative;
  cursor: pointer;
  transition: background 0.18s, border-color 0.18s;
  flex-shrink: 0;
}
.toggle-row input[type="checkbox"]::after {
  content: '';
  position: absolute;
  width: 11px;
  height: 11px;
  background: var(--text-dim);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: left 0.18s, background 0.18s;
}
.toggle-row input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.toggle-row input[type="checkbox"]:checked::after {
  left: 15px;
  background: #fff;
}

/* ── Status ──────────────────────────────────────────────── */
.status-msg {
  padding: 10px 16px 4px;
  font-size: 0.76rem;
  color: var(--text-dim);
  min-height: 24px;
}

/* ── Sidebar actions ─────────────────────────────────────── */
.sidebar-actions {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.btn {
  border: none;
  border-radius: 7px;
  padding: 9px 12px;
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s, opacity 0.12s, transform 0.08s;
  width: 100%;
  letter-spacing: 0.01em;
}
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn-secondary { background: var(--secondary); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { background: var(--secondary-hv); }

.btn-danger { background: rgba(224,85,117,0.12); color: var(--danger); border: 1px solid rgba(224,85,117,0.28); }
.btn-danger:hover:not(:disabled) { background: rgba(224,85,117,0.22); }

.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover:not(:disabled) { color: var(--text); border-color: var(--text-dim); }

/* ── Canvas area ─────────────────────────────────────────── */
#canvasArea {
  flex: 1 1 0;
  min-width: 0;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  position: relative;
  overflow: hidden;
}

#canvas {
  display: block;
  background: #000;
  cursor: crosshair;
}

/* ── Mobile menu button ──────────────────────────────────── */
#mobileMenuBtn {
  display: none;
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  color: var(--text-bright);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  font-size: 1.1rem;
  cursor: pointer;
  z-index: 50;
  align-items: center;
  justify-content: center;
}

/* ── Mobile overlay ──────────────────────────────────────── */
#sidebarOverlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 99;
}
#sidebarOverlay.visible { display: block; }

/* ── Mobile layout ───────────────────────────────────────── */
@media (max-width: 620px) {
  #sidebar {
    position: fixed;
    left: calc(-1 * var(--sidebar-w));
    top: 0;
    height: 100%;
    z-index: 100;
    transition: left 0.25s ease;
    box-shadow: 4px 0 24px rgba(0,0,0,0.6);
  }
  #sidebar.open { left: 0; }
  #mobileMenuBtn { display: flex; }
  body { display: block; }
  #canvasArea { width: 100%; height: 100vh; }
}