/* ══════════════════════════════════════════════════════════════
   MatheChecks – Stift-Overlay
   ══════════════════════════════════════════════════════════════ */

/* ── Canvas ──
   Liegt im Stacking-Context von .shell, bewusst UNTER den sticky-Headern
   (Jump-Nav 35, Tab-Nav 45, Sidebar 60, Topbar 70), aber über dem Inhalt.
   So verschwinden Anmerkungen beim Scrollen hinter den Headern statt darüber. */
#pen-canvas {
  position: fixed;
  inset: 0;
  z-index: 30;
  pointer-events: none;
  touch-action: none;
}

/* ── Toolbar ── */
#pen-toolbar {
  position: fixed;
  right: 14px;
  /* unterhalb Topbar + Modul-Tab-Nav + optionaler Check-Nav */
  top: calc(
    var(--sticky-topbar-h, 72px)
    + var(--module-tab-nav-h, 52px)
    + var(--module-check-nav-h, 0px)
    + 24px
  );
  z-index: 210;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

/* ── Basis-Button ── */
.pen-fab {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--panel-solid);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.22);
  transition: transform 0.14s, box-shadow 0.14s, background 0.14s, color 0.14s;
  flex-shrink: 0;
  font-family: inherit;
  user-select: none;
  -webkit-user-select: none;
}

.pen-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.30);
  background: var(--surface-hi);
  color: var(--text);
}

.pen-fab:active { transform: scale(0.93); }

/* ── Icons (inline SVG, erben Button-Farbe über currentColor) ── */
.pen-fab svg {
  width: 20px;
  height: 20px;
  display: block;
  pointer-events: none;
}

#pen-btn-toggle svg { width: 22px; height: 22px; }

#pen-btn-undo svg,
#pen-btn-delete-sel svg,
#pen-btn-clear svg { width: 17px; height: 17px; }

/* ── Toggle (immer sichtbar) ── */
#pen-btn-toggle {
  width: 44px;
  height: 44px;
  font-size: 18px;
  background: color-mix(in srgb, var(--surface) 80%, var(--panel-solid));
}

#pen-btn-toggle.active {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 18px rgba(124, 106, 255, 0.45);
}

#pen-btn-toggle.active:hover {
  background: color-mix(in srgb, var(--accent) 85%, #fff);
  transform: scale(1.05);
}

/* ── Sub-Tools: versteckt wenn Stiftmodus off ── */
.pen-tool {
  opacity: 0;
  pointer-events: none;
  transform: translateX(10px) scale(0.82);
  transition: opacity 0.18s, transform 0.18s;
}

.pen-tool.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0) scale(1);
}

/* Gestaffeltes Einblenden */
.pen-tool:nth-child(2)  { transition-delay: 0ms; }
.pen-tool:nth-child(3)  { transition-delay: 25ms; }
.pen-tool:nth-child(4)  { transition-delay: 45ms; }
.pen-tool:nth-child(5)  { transition-delay: 62ms; }
.pen-tool:nth-child(6)  { transition-delay: 76ms; }
.pen-tool:nth-child(7)  { transition-delay: 88ms; }
.pen-tool:nth-child(8)  { transition-delay: 98ms; }
.pen-tool:nth-child(9)  { transition-delay: 106ms; }
.pen-tool:nth-child(10) { transition-delay: 113ms; }
.pen-tool:nth-child(11) { transition-delay: 119ms; }
.pen-tool:nth-child(12) { transition-delay: 124ms; }
.pen-tool:nth-child(13) { transition-delay: 128ms; }
.pen-tool:nth-child(14) { transition-delay: 131ms; }
.pen-tool:nth-child(15) { transition-delay: 133ms; }

/* ── Aktives Werkzeug (Ring) ── */
.pen-fab.pen-tool-active {
  box-shadow: 0 0 0 2px var(--accent), 0 2px 10px rgba(0, 0, 0, 0.22);
  background: var(--surface-hi);
  color: var(--text);
}

/* ── Farb-Dots ── */
.pen-color-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2.5px solid transparent;
  cursor: pointer;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.22);
  transition: border-color 0.14s, transform 0.14s, opacity 0.18s;
  flex-shrink: 0;
  padding: 0;
  appearance: none;
  -webkit-appearance: none;
  display: block;
}

.pen-color-dot:hover   { transform: scale(1.18); }
.pen-color-dot.selected { border-color: var(--text); }

/* ── Trennlinie ── */
.pen-fab-sep {
  width: 22px;
  height: 1px;
  background: var(--border);
  border-radius: 1px;
  flex-shrink: 0;
  margin: 2px 0;
}

/* ── Kleine Aktions-Buttons ── */
#pen-btn-undo,
#pen-btn-clear {
  width: 34px;
  height: 34px;
  font-size: 14px;
}

/* Lasso-Löschen (erscheint nur mit Selektion) */
#pen-btn-delete-sel {
  width: 34px;
  height: 34px;
  font-size: 14px;
  background: color-mix(in srgb, var(--rose-soft) 60%, var(--panel-solid));
  border-color: color-mix(in srgb, var(--rose) 30%, var(--border));
  color: var(--rose);
}

#pen-btn-delete-sel:hover {
  background: var(--rose-soft);
  color: var(--rose);
}

/* ── Hinweis-Bar (Lasso) ── */
#pen-lasso-hint {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  background: var(--panel-solid);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 18px;
  font-size: 0.78rem;
  color: var(--text-dim);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 220;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  font-family: inherit;
}

#pen-lasso-hint.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Body-Zustände ──
   Im Stiftmodus zeichnet Maus/Stylus, Finger-Touch scrollt weiterhin.
   Daher KEIN pointer-events:none auf dem Inhalt (das würde Touch-Scroll
   blockieren) – nur Textauswahl unterbinden und den Stift-Cursor zeigen.
   Der Cursor-Wert kommt dynamisch (farbabhängig) per JS über --pen-cursor. */
body.pen-active .mod-content,
body.pen-active .mod-content * {
  cursor: var(--pen-cursor, crosshair) !important;
  user-select: none;
  -webkit-user-select: none;
}

/* Scrollsperre nur, solange ein Stift/die Maus aktiv ist (per JS getoggelt).
   So zeichnet der Stift, statt den Inhalt zu scrollen. Bei Finger-Touch wird
   die Klasse entfernt → Touch scrollt weiterhin nativ. Mausrad bleibt von
   touch-action unberührt. */
body.pen-active.pen-input-active .mod-main,
body.pen-active.pen-input-active .mod-content,
body.pen-active.pen-input-active .mod-content * {
  touch-action: none !important;
}

/* ── Light-Mode ── */
html.light .pen-fab {
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.10);
}

html.light #pen-btn-toggle.active {
  box-shadow: 0 4px 18px rgba(108, 92, 231, 0.35);
}

/* ── Mobile ── */
@media (max-width: 680px) {
  #pen-toolbar {
    right: 8px;
    gap: 5px;
    display: none;
  }

  .pen-fab {
    width: 36px;
    height: 36px;
    font-size: 13px;
  }

  #pen-btn-toggle {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

  .pen-color-dot {
    width: 22px;
    height: 22px;
  }
}