/**
 * =========================================================
 * THEME VARIABLES (Light Saffron)
 * =========================================================
 * CHANGE THIS -> DO THIS:
 * - Want deeper saffron: change --accent
 * - Want softer background: change --bg
 * - Want taller toolbar: change --toolbar-h
 */
:root {
  --bg: #fff7eb;          /* page background */
  --panel: #ffffff;       /* card/panel background */

  --accent: #f4a300;      /* main saffron */
  --accent-soft: #fde9c8; /* soft saffron */
  --accent-muted: #f9d18a;

  --ink: #2b2b2b;
  --ink-soft: #5b5b5b;

  --toolbar-h: 66px;
}

/* Branding block in toolbar */
.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  margin-right: 8px;
}

.brand .title {
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
}

.brand .author {
  font-size: 11px;
  color: var(--ink-soft);
}

html,
body {
  height: 100%;
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: #0b2545;
}

/**
 * App shell: toolbar + main content
 */
.app {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/**
 * Toolbar styling
 * CHANGE THIS -> DO THIS:
 * - Want sticky toolbar? add position: sticky; top:0;
 * - Want darker border? increase border alpha
 */
.toolbar {
  height: var(--toolbar-h);
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px;
  background: linear-gradient(180deg, #ffffff, #f5f9ff);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  flex-shrink: 0;
  position: relative;
}

.toolbar .group {
  display: flex;
  gap: 8px;
  align-items: center;
}

.toolbar button,
.toolbar input[type="color"],
.toolbar input[type="range"],
.toolbar input[type="number"],
.toolbar select {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
}

.toolbar button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.toolbar .spacer {
  flex: 1;
}

/* Collapse menu button */
#menuCollapse {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  cursor: pointer;
  font-size: 18px;
}

/* Collapsed mode hides elements with this class */
.toolbar.collapsed .hide-when-collapsed {
  display: none;
}

.toolbar.collapsed {
  gap: 6px;
}

/* Dropdown appears under toolbar when collapsed */
.toolbar-dropdown {
  position: absolute;
  left: 8px;
  top: calc(var(--toolbar-h) + 6px);
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
  z-index: 10050;
  padding: 10px;
  display: none;
  min-width: 320px;
  max-width: calc(100% - 24px);
}

.toolbar-dropdown.show {
  display: block;
}

/**
 * Layout: left tool column + stage viewport
 */
.layout {
  display: flex;
  flex: 1;
  gap: 12px;
  padding: 12px;
  box-sizing: border-box;
}

.leftcol {
  width: 88px;
  min-width: 72px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

/* Tool buttons (Pen/Highlight/Eraser/Select) */
.toolbtn {
  width: 64px;
  text-align: center;
  padding: 8px;
  border-radius: 8px;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  cursor: pointer;
  font-size: 13px;
}

/* Active tool highlight */
.toolbtn.active {
  box-shadow: 0 6px 18px rgba(244, 163, 0, 0.35);
  border-color: var(--accent);
}

/**
 * Stage viewport:
 * - Holds world (canvas+objects)
 * - Has border and watermark background
 */
.stage-viewport {
  flex: 1;
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  border: 3px solid var(--accent);
  overflow: hidden;
  position: relative;
  min-height: 300px;
}

/* World = big transformable plane. JS sets width/height and transform. */
.world {
  position: absolute;
  left: 0;
  top: 0;
  transform-origin: 0 0;
  will-change: transform;
  background-size: 20px 20px, 20px 20px;
}

/* Grid on/off */
.world.grid {
  background-image:
    linear-gradient(90deg, rgba(244, 163, 0, 0.18) 1px, transparent 1px),
    linear-gradient(rgba(244, 163, 0, 0.18) 1px, transparent 1px);
}

.world.nogrid { background-image: none; }

.objects-layer {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: auto;
}

canvas.draw-layer {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
}

/* Objects */
.obj {
  position: absolute;
  box-sizing: border-box;
  transform-origin: center center;
  touch-action: none;
  user-select: none;
  transition: box-shadow 0.12s ease;
}

.obj .content {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Default rect/circle look */
.obj.rect {
  background: rgba(63, 107, 255, 0.06);
  border: 2px solid rgba(63, 107, 255, 0.18);
  border-radius: 8px;
}

.obj.circle {
  background: rgba(255, 200, 60, 0.10);
  border: 2px solid rgba(255, 180, 0, 0.22);
  border-radius: 999px;
}

.obj.text {
  background: transparent;
  border: 1px dashed rgba(0, 0, 0, 0.06);
  padding: 6px 8px;
  font-size: 16px;
  color: #000;
}

.obj img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 6px;
}

.obj.selected {
  box-shadow: 0 12px 30px rgba(244, 163, 0, 0.25);
  outline: 2px solid rgba(244, 163, 0, 0.25);
}

/* Handles for rotate/resize */
.handle {
  position: absolute;
  width: 12px;
  height: 12px;
  background: #ffffff;
  border: 2px solid rgba(0, 0, 0, 0.12);
  border-radius: 3px;
  box-sizing: border-box;
  z-index: 40;
}

.handle.rotate {
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  cursor: grab;
}

.handle.resize {
  right: -10px;
  bottom: -10px;
  cursor: se-resize;
}

/* Selection rectangle */
.sel-rect {
  position: fixed;
  border: 1px dashed rgba(0, 0, 0, 0.25);
  background: rgba(63, 107, 255, 0.06);
  pointer-events: none;
  z-index: 20000;
  display: none;
}

/* Eraser cursor overlay */
#eraserCursor {
  position: fixed;
  pointer-events: none;
  border: 2px dashed rgba(0, 0, 0, 0.35);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  z-index: 10030;
  display: none;
  box-sizing: border-box;
}

#eraserSizeLabel {
  position: fixed;
  pointer-events: none;
  z-index: 10031;
  transform: translate(-50%, -120%);
  background: rgba(20, 30, 60, 0.9);
  color: #ffffff;
  font-size: 12px;
  padding: 4px 6px;
  border-radius: 6px;
  display: none;
  white-space: nowrap;
}

/* Guide panel */
.guide {
  position: fixed;
  right: 12px;
  bottom: 12px;
  width: 320px;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 14px 40px rgba(31, 41, 55, 0.12);
  z-index: 10020;
  padding: 0;
  border: 1px solid rgba(63, 107, 255, 0.12);
  font-size: 13px;
}

.guide .head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.guide .content {
  padding: 10px;
  max-height: 320px;
  overflow: auto;
}

/* Help button */
#helpBtn {
  position: fixed;
  right: 12px;
  bottom: 12px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid rgba(63, 107, 255, 0.25);
  background: #ffffff;
  font-size: 20px;
  display: none;
  z-index: 10025;

  /* Overridden border to match saffron theme */
  border-color: rgba(244, 163, 0, 0.4);
}

/* Responsive tweaks */
@media (max-width: 920px) {
  .layout { padding: 8px; gap: 8px; }
  .leftcol { display: none; }
  .toolbar.small-screen { flex-wrap: wrap; }
}

@media (max-width: 520px) {
  .guide { width: 92%; right: 4%; left: 4%; bottom: 12px; }
  #helpBtn { right: 14px; bottom: 14px; }
  .toolbar-dropdown { left: 8px; right: 8px; min-width: auto; }
}

/**
 * =========================================================
 * WATERMARK
 * =========================================================
 * CHANGE THIS -> DO THIS:
 * - Want watermark stronger? increase opacity
 * - Want smaller repeats? adjust background-size
 * - Want different text? edit the SVG text inside data URL
 */
.stage-viewport { position: relative; }

canvas.draw-layer,
.objects-layer {
  position: absolute;
  z-index: 1;
}

.stage-viewport::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;

  opacity: 0.3;

  background-image: url("data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A//www.w3.org/2000/svg%27%20width%3D%27500%27%20height%3D%27280%27%3E%3Cg%20transform%3D%27translate(40%2C160)%20rotate(-20)%27%3E%3Ctext%20x%3D%270%27%20y%3D%270%27%20font-family%3D%27Segoe%20UI%2C%20system-ui%2C%20Arial%27%20font-size%3D%2722%27%20fill%3D%27%23f4a300%27%20fill-opacity%3D%271%27%3EProgrammer%E2%80%99s%20Picnic%20%E2%80%A2%20Champak%20Roy%3C/text%3E%3C/g%3E%3C/svg%3E");

  background-repeat: repeat;
  background-size: 560px 320px;
}
/* Lesson button */
.lesson-btn {
  position: fixed;
  left: 14px;
  bottom: 14px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 2px solid var(--accent);
  background: #fff;
  font-size: 14px;
  cursor: pointer;
  z-index: 10040;
  box-shadow: 0 6px 16px rgba(244,163,0,0.25);
}

/* Modal overlay */
.lesson-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10050;
}

.lesson-modal.hidden {
  display: none;
}

/* Panel */
.lesson-panel {
  width: 420px;
  max-width: 90%;
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

/* Header */
.lesson-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  background: var(--accent-soft);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.lesson-header button {
  border: none;
  background: none;
  font-size: 18px;
  cursor: pointer;
}

/* Lesson list */
.lesson-list {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Lesson card */
.lesson-card {
  padding: 10px;
  border-radius: 10px;
  border: 1px solid rgba(0,0,0,0.08);
  background: #fff;
  cursor: pointer;
  transition: all 0.15s ease;
}

.lesson-card:hover {
  border-color: var(--accent);
  box-shadow: 0 6px 16px rgba(244,163,0,0.25);
}

.lesson-card .title {
  font-weight: 600;
  color: #000;
}

.lesson-card .topic {
  font-size: 12px;
  color: var(--accent);
}

.lesson-card .desc {
  font-size: 13px;
  color: #444;
  margin-top: 4px;
}