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

:root {
  --bg:          #e8eaed;
  --sidebar-bg:  #ffffff;
  --text:        #1f2937;
  --muted:       #6b7280;
  --accent:      #3b82f6;
  --accent-h:    #2563eb;
  --danger:      #ef4444;
  --danger-h:    #dc2626;
  --panel-bg:    #f3f4f6;
  --border:      #d1d5db;
  --border-h:    #9ca3af;
}

html, body { height: 100%; font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); }

/* ══ LAYOUT ══ */
#app { display: flex; height: 100vh; overflow: hidden; }

/* ══ SIDEBAR ══ */
#sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  padding: 16px 14px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-right: 2px solid var(--border);
  box-shadow: 2px 0 8px rgba(0,0,0,0.06);
}

#sidebar h1    { font-size: 1.2rem; color: var(--accent); letter-spacing: .02em; }
.subtitle      { font-size: .72rem; color: var(--muted); margin-bottom: 4px; }

.panel-title {
  border-color: var(--accent);
  border-width: 1.5px;
}

/* ══ PRZEŁĄCZNIK TRYBU ══ */
#modeSwitcher {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
}

.mode-btn {
  border: none;
  background: transparent;
  border-radius: 6px;
  padding: 7px 4px;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
  transition: background .15s, color .15s;
}
.mode-btn:hover  { background: var(--border); color: var(--text); }
.mode-btn.active { background: var(--accent); color: #fff; }

/* ══ PANELE ══ */
.mode-panel { display: flex; flex-direction: column; gap: 6px; }
.mode-panel.hidden { display: none !important; }

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.panel h2 {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}

.sub-panel {
  background: #e9ebee;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ══ FORMULARZE ══ */
label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: .82rem;
  color: var(--text);
  cursor: pointer;
}

.row-label { gap: 5px; }

.range-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.range-row input[type="range"] { flex: 1; }
.range-row span { min-width: 22px; font-size: .78rem; color: var(--muted); }

input[type="range"]  { accent-color: var(--accent); cursor: pointer; width: 100%; }
input[type="text"],
input[type="number"],
select {
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 5px 8px;
  font-size: .82rem;
  width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--accent); border-color: var(--accent); }

.radio-group { display: flex; flex-direction: column; gap: 5px; }
.radio-group label { flex-direction: row; align-items: center; gap: 7px; }
.radio-group input[type="radio"] { accent-color: var(--accent); }

.checkbox-label { flex-direction: row !important; align-items: center; gap: 7px; }

/* ══ NARZĘDZIA ══ */
.tool-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}
.tool-btn {
  border: 1px solid var(--border);
  background: var(--sidebar-bg);
  border-radius: 6px;
  padding: 6px 4px;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
  transition: background .12s, color .12s, border-color .12s;
}
.tool-btn:hover  { background: var(--border); color: var(--text); }
.tool-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ══ PALETA KOLORÓW ══ */
#colorPalette {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: center;
}
.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .1s, border-color .1s;
  flex-shrink: 0;
}
.color-swatch:hover  { transform: scale(1.15); }
.color-swatch.active { border-color: var(--accent); transform: scale(1.2); }

#colorCustom {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px;
  cursor: pointer;
  background: none;
}

/* ══ PRZYCISKI ══ */
.btn-primary, .btn-secondary, .btn-danger, .btn-download, .btn-upload, .btn-close, .btn-sm {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 6px;
  padding: 7px 12px;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .14s;
}

.btn-primary  { background: var(--accent);  color: #fff; }
.btn-primary:hover  { background: var(--accent-h); }

.btn-download        { background: #4f883d; color: #fff; }
.btn-download:hover  { background: #3d6b2f; }

.btn-secondary { background: var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--border-h); color: #fff; }

.btn-danger   { background: var(--danger);  color: #fff; }
.btn-danger:hover   { background: var(--danger-h); }

.btn-upload {
  background: var(--border);
  color: var(--text);
  width: 100%;
}
.btn-upload:hover { background: var(--border-h); color: #fff; }

.btn-close {
  background: transparent;
  color: var(--muted);
  padding: 4px 8px;
  font-size: 1.1rem;
}
.btn-close:hover { color: var(--danger); }

.btn-sm { padding: 4px 10px; font-size: .76rem; }

.actions { gap: 6px; }

.hint { font-size: .7rem; color: var(--muted); line-height: 1.45; }
.hint.center { text-align: center; }
.hidden { display: none !important; }

/* ══ EDITOR AREA ══ */
#editorArea {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
  overflow: auto;
  padding: 16px 24px 24px;
  gap: 12px;
}

#editorToolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 14px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  flex-shrink: 0;
}

.toolbar-label {
  font-size: .78rem;
  color: var(--muted);
  font-weight: 600;
  margin-right: 2px;
}

#editorZoom {
  width: 110px;
  accent-color: var(--accent);
  cursor: pointer;
}

#editorZoomVal {
  font-size: .78rem;
  font-weight: 700;
  color: var(--text);
  min-width: 40px;
  text-align: center;
}

.zoom-btn {
  border: 1px solid var(--border);
  background: var(--panel-bg);
  border-radius: 5px;
  width: 24px;
  height: 24px;
  font-size: .85rem;
  cursor: pointer;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .12s;
  padding: 0;
}
.zoom-btn:hover { background: var(--border); }

#canvasWrapper {
  position: relative;
  box-shadow: 0 4px 32px rgba(0,0,0,0.18);
  border-radius: 4px;
  background: white;
  transform-origin: top center;
  flex-shrink: 0;
}

#bgCanvas, #eraseCanvas, #drawCanvas, #dotsCanvas {
  position: absolute;
  top: 0; left: 0;
  border-radius: 4px;
}
#bgCanvas    { z-index: 1; pointer-events: none; }
#drawCanvas  { z-index: 2; pointer-events: none; }
#eraseCanvas { z-index: 3; pointer-events: none; }
#dotsCanvas  { z-index: 4; cursor: crosshair; }

/* ══ MODAL ══ */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-inner {
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: min(900px, 95vw);
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  gap: 16px;
}
.modal-header h2 { font-size: 1rem; color: var(--accent); white-space: nowrap; }

.preview-scale-control {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  color: var(--muted);
  flex: 1;
  justify-content: center;
}
.preview-scale-control input[type="range"] { width: 120px; cursor: pointer; }
#previewScaleVal { font-weight: 600; color: var(--text); min-width: 38px; text-align: right; }

#previewContainer {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: #c8cdd5;
}
#previewCanvas { box-shadow: 0 2px 16px rgba(0,0,0,0.35); }

.modal-footer {
  display: flex;
  gap: 10px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  justify-content: flex-end;
}

/* ══ SCROLLBAR ══ */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }