/* ═══════════════════════════════════════
   KALEIDOSCOPE DRAWING — styles
═══════════════════════════════════════ */

:root {
  --bg:        #1a1a1a;
  --panel:     #242424;
  --panel2:    #2e2e2e;
  --border:    #3a3a3a;
  --accent:    #4a9eff;
  --accent2:   #7b5fff;
  --text:      #e0e0e0;
  --text-dim:  #888;
  --danger:    #ff4545;
  --top-h:     48px;
  --bot-h:     64px;
  --sb-w:      100px;
}

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 13px;
  user-select: none;
  -webkit-user-select: none;
}

/* ─── APP SHELL ──────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  width: 100%; height: 100%;
}

/* ─── TOP BAR ────────────────────────── */
#top-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  height: var(--top-h);
  padding: 0 10px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
  overflow: hidden;
}

.tb-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tb-label {
  color: var(--text-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.tb-btns {
  display: flex;
  gap: 3px;
  flex-wrap: wrap;
}

.tb-actions {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

/* ─── MAIN AREA ──────────────────────── */
#main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ─── SIDEBAR ────────────────────────── */
#sidebar {
  width: var(--sb-w);
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
}

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

.sb-section {
  padding: 8px 6px;
  border-bottom: 1px solid var(--border);
}

.sb-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 6px;
  padding-left: 2px;
}

/* ─── CANVAS CONTAINER ───────────────── */
#canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--canvas-bg, #ffffff);
  transition: background 0.2s;
}

#canvas-container canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: block;
}

#guide-canvas {
  pointer-events: none;
  z-index: 2;
}

#main-canvas {
  cursor: crosshair;
  z-index: 1;
  touch-action: none;
}

/* ─── BOTTOM BAR ─────────────────────── */
#bottom-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  height: var(--bot-h);
  padding: 0 14px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  overflow: hidden;
}

.bb-group {
  display: flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
}

.bb-group label {
  color: var(--text-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.bb-group output {
  color: var(--text);
  font-size: 12px;
  min-width: 26px;
  text-align: right;
}

.bb-group span {
  color: var(--text-dim);
  font-size: 11px;
}

/* ─── BUTTONS ────────────────────────── */
.sym-btn,
.fx-btn {
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.sym-btn:hover, .fx-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.sym-btn.active, .fx-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.act-btn {
  width: 32px; height: 32px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}

.act-btn svg { width: 16px; height: 16px; }

.act-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.act-btn.danger { border-color: transparent; }
.act-btn.danger:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* ─── TOOL GRID ──────────────────────── */
.tool-grid {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tool-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 2px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
  width: 100%;
}

.tool-btn svg {
  width: 20px; height: 20px;
  fill: currentColor;
}

.tool-btn span {
  font-size: 10px;
  line-height: 1;
}

.tool-btn:hover {
  background: var(--panel2);
  color: var(--text);
}

.tool-btn.active {
  background: color-mix(in srgb, var(--accent) 20%, transparent);
  border-color: var(--accent);
  color: var(--accent);
}

/* ─── PATTERN GRID ───────────────────── */
.pattern-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
}

.pattern-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 4px 2px;
  border: 1px solid transparent;
  border-radius: 5px;
  background: var(--panel2);
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
}

.pattern-btn canvas {
  display: block;
}

.pattern-btn span {
  font-size: 9px;
  line-height: 1;
  text-align: center;
}

.pattern-btn:hover {
  border-color: var(--border);
  color: var(--text);
}

.pattern-btn.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 20%, transparent);
  color: var(--accent);
}

/* ─── SLIDERS ────────────────────────── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
  cursor: pointer;
  width: 100px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

/* ─── COLOR PICKER ───────────────────── */
.color-swatch-wrap {
  position: relative;
  cursor: pointer;
  display: inline-flex;
}

.color-swatch-wrap input[type="color"] {
  position: absolute;
  opacity: 0;
  width: 0; height: 0;
  pointer-events: none;
}

.color-swatch {
  display: block;
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: border-color 0.15s;
  flex-shrink: 0;
}

.color-swatch.big {
  width: 40px; height: 40px;
}

.color-swatch-wrap:hover .color-swatch {
  border-color: var(--accent);
}

.swatches-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.swatch {
  width: 18px; height: 18px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.1);
  cursor: pointer;
  transition: transform 0.1s;
  flex-shrink: 0;
}

.swatch:hover { transform: scale(1.2); }

/* ─── BACKGROUND PRESETS ─────────────── */
.bg-presets-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.bg-dot {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: var(--c);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
  flex-shrink: 0;
  outline: 1px solid rgba(255,255,255,0.15);
}

.bg-dot:hover { transform: scale(1.15); }
.bg-dot.active { border-color: var(--accent); }

/* ═══════════════════════════════════════
   MOBILE UI
═══════════════════════════════════════ */

/* Hidden by default — shown on mobile */
#mobile-top-bar,
#sheet-toggle-btn,
#bottom-sheet {
  display: none;
}

/* Desktop: show sidebar + bottom-bar */
@media (max-width: 767px) {
  /* Hide desktop panels */
  #sidebar, #bottom-bar, #top-bar { display: none; }

  /* Show mobile UI */
  #mobile-top-bar,
  #sheet-toggle-btn,
  #bottom-sheet { display: flex; }

  #bottom-sheet { display: block; }

  /* Canvas fills whole screen */
  #app { height: 100dvh; }
  #main-area { height: 100dvh; }
  #canvas-container { width: 100%; height: 100dvh; }

  /* ─── Mobile Top Bar ─── */
  #mobile-top-bar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 48px;
    z-index: 100;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    padding: 0 10px;
    background: rgba(26,26,26,0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
  }

  .m-act-btn {
    width: 40px; height: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel);
    color: var(--text);
    font-size: 16px;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.15s;
    touch-action: manipulation;
  }

  .m-act-btn svg { width: 18px; height: 18px; }
  .m-act-btn.danger:active { color: var(--danger); border-color: var(--danger); }
  .m-act-btn:active { border-color: var(--accent); }

  /* ─── Sheet Toggle Button ─── */
  #sheet-toggle-btn {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 101;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 24px;
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    transition: all 0.2s;
    touch-action: manipulation;
  }

  #sheet-toggle-btn svg { width: 16px; height: 16px; }
  #sheet-toggle-btn.sheet-open { opacity: 0; pointer-events: none; }

  /* ─── Bottom Sheet ─── */
  #bottom-sheet {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 200;
    background: var(--panel);
    border-top: 1px solid var(--border);
    border-radius: 16px 16px 0 0;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
    max-height: 70dvh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 -8px 32px rgba(0,0,0,0.6);
  }

  #bottom-sheet.sheet-open {
    transform: translateY(0);
  }

  .sheet-handle {
    width: 36px; height: 4px;
    background: var(--border);
    border-radius: 2px;
    margin: 10px auto 4px;
    flex-shrink: 0;
    cursor: grab;
  }

  .sheet-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
  }

  .stab {
    flex: 1;
    padding: 10px 4px;
    border: none;
    background: transparent;
    color: var(--text-dim);
    font-size: 13px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.15s;
    touch-action: manipulation;
  }

  .stab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  #sheet-close-btn {
    flex: 0 0 auto;
    width: 40px;
    border: none;
    background: transparent;
    color: var(--text-dim);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
    padding: 0;
  }

  #sheet-close-btn:active { color: var(--text); }

  .sheet-body {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 12px;
    -webkit-overflow-scrolling: touch;
  }

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

  .tab-pane { display: none; }
  .tab-pane.active { display: block; }

  /* ─── Mobile Tool Grid ─── */
  .m-tool-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 14px;
  }

  .m-tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 4px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel2);
    color: var(--text-dim);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.15s;
    touch-action: manipulation;
    min-height: 60px;
  }

  .m-tool-btn svg { width: 20px; height: 20px; fill: currentColor; }

  .m-tool-btn:active { background: var(--panel); }
  .m-tool-btn.active {
    background: color-mix(in srgb, var(--accent) 20%, transparent);
    border-color: var(--accent);
    color: var(--accent);
  }

  /* ─── Mobile Sliders ─── */
  .m-slider-row {
    margin-bottom: 12px;
  }

  .m-slider-row label {
    display: flex;
    justify-content: space-between;
    color: var(--text-dim);
    font-size: 12px;
    margin-bottom: 6px;
  }

  .m-slider-row label span {
    color: var(--text);
  }

  .m-slider-row input[type="range"] {
    width: 100%;
  }

  /* ─── Mobile Pattern Grid ─── */
  .m-pattern-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }

  .m-pattern-grid .pattern-btn {
    padding: 6px 2px;
    min-height: 56px;
  }

  /* ─── Mobile Color ─── */
  .m-color-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
  }

  .m-color-row span {
    color: var(--text-dim);
    font-size: 13px;
  }

  /* ─── Mobile Settings ─── */
  .m-setting-group {
    margin-bottom: 14px;
  }

  .m-setting-group > label {
    display: block;
    color: var(--text-dim);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
  }

  .m-setting-group .tb-btns {
    gap: 5px;
  }

  .m-setting-group .sym-btn,
  .m-setting-group .fx-btn {
    padding: 6px 10px;
    font-size: 13px;
    min-height: 36px;
    touch-action: manipulation;
  }
}

/* Very small screens */
@media (max-width: 380px) {
  .m-tool-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .m-pattern-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ═══════════════════════════════════════
   CURSOR SIZE PREVIEW
═══════════════════════════════════════ */
#cursor-ring {
  position: fixed;
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  mix-blend-mode: difference;
  transition: width 0.1s, height 0.1s;
  display: none;
}

/* ═══════════════════════════════════════
   TOAST NOTIFICATION
═══════════════════════════════════════ */
#toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: rgba(40,40,40,0.95);
  color: var(--text);
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 13px;
  border: 1px solid var(--border);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 9999;
  white-space: nowrap;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 767px) {
  #toast { bottom: 100px; }
}