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

:root {
  --bg:        #080b10;
  --surface:   #121722;
  --surface2:  #192231;
  --surface3:  #1e2a3a;
  --border:    rgba(255,255,255,0.11);
  --accent:    #caff38;
  --accent-h:  #b8e832;
  --text:      #f7f7f2;
  --text-dim:  #b8c0cc;
  --panel-w:   72px;
  --right-w:   240px;
  --toolbar-h: 48px;
}

html, body {
  height: 100%;
  overflow: hidden;
  background:
    radial-gradient(circle at 10% 0%, rgba(202,255,56,.10), transparent 30%),
    radial-gradient(circle at 92% 8%, rgba(121,255,77,.07), transparent 26%),
    var(--bg);
  color: var(--text);
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

/* ── Toolbar ──────────────────────────────────────────────────────────────── */
#toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--toolbar-h);
  background: rgba(8,11,16,0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 12px;
  gap: 8px;
  flex-shrink: 0;
  z-index: 10;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.app-name {
  font-size: 16px;
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--accent);
  margin-right: 8px;
  text-shadow: 0 0 20px rgba(202,255,56,0.35);
}

.toolbar-sep {
  width: 1px;
  height: 22px;
  background: var(--border);
  margin: 0 6px;
}

#zoom-display {
  font-size: 12px;
  color: var(--text-dim);
  min-width: 40px;
  text-align: center;
}

/* ── Record button ────────────────────────────────────────────────────────── */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.rec-dot {
  display: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff3b3b;
  flex-shrink: 0;
  animation: blink 1.2s ease-in-out infinite;
}

#btn-record.recording {
  border-color: #ff3b3b;
  color: #ff3b3b;
}

#btn-record.recording .rec-dot { display: block; }

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  color: var(--text);
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.1s, border-color 0.1s;
  user-select: none;
}

.btn:hover:not(:disabled) { background: rgba(255,255,255,0.11); border-color: rgba(255,255,255,0.22); }
.btn:active:not(:disabled) { background: var(--accent); border-color: var(--accent); color: #080b10; }
.btn:disabled { opacity: 0.35; cursor: default; }
.btn.icon-btn { padding: 5px 10px; font-size: 14px; }
.btn.accent { background: var(--accent); border-color: var(--accent); color: #080b10; font-weight: 700; }
.btn.accent:hover:not(:disabled) { background: var(--accent-h); box-shadow: 0 0 18px rgba(202,255,56,0.35); }

/* ── Layout ───────────────────────────────────────────────────────────────── */
#app-layout {
  display: flex;
  height: calc(100vh - var(--toolbar-h));
  overflow: hidden;
}

/* ── Left panel ───────────────────────────────────────────────────────────── */
#panel-left {
  width: var(--panel-w);
  background: linear-gradient(180deg, var(--surface2), var(--surface));
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 0;
  gap: 4px;
  flex-shrink: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.tool-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 0 6px;
}

.tool-sep {
  width: 40px;
  height: 1px;
  background: var(--border);
  margin: 6px 0;
}

.tool-btn {
  width: 48px;
  height: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
  font-size: 10px;
  font-weight: 500;
}

.tool-btn svg { width: 20px; height: 20px; }
.tool-btn:hover { background: var(--surface2); color: var(--text); }
.tool-btn.active { background: rgba(202,255,56,0.10); color: var(--accent); border-color: rgba(202,255,56,0.4); box-shadow: 0 0 12px rgba(202,255,56,0.12); }

.size-preview-wrap {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}
#size-preview-dot {
  border-radius: 50%;
  background: var(--text);
  pointer-events: none;
  transition: width 0.1s, height 0.1s;
}

.left-slider-wrap {
  width: 100%;
  padding: 0 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.left-slider-label {
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input[type="range"].vertical {
  writing-mode: vertical-lr;
  direction: rtl;
  width: 80px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--accent);
}

input[type="range"].horizontal {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ── Canvas area ──────────────────────────────────────────────────────────── */
#canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(45deg, #0e1520 25%, transparent 25%),
    linear-gradient(-45deg, #0e1520 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #0e1520 75%),
    linear-gradient(-45deg, transparent 75%, #0e1520 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
  background-color: #080b10;
}

#canvas-viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
  touch-action: none;
}

#canvas-wrapper {
  position: absolute;
  top: 0; left: 0;
  transform-origin: 0 0;
}

#color-canvas,
#temp-canvas,
#lines-canvas {
  position: absolute;
  top: 0; left: 0;
  display: block;
}

#lines-canvas   { pointer-events: none; }
#temp-canvas    { pointer-events: none; }

/* ── Empty state ──────────────────────────────────────────────────────────── */
#empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  pointer-events: none;
}

#empty-state.hidden { display: none; }

#empty-state .empty-icon { font-size: 56px; opacity: 0.25; }

#empty-state p {
  font-size: 15px;
  color: var(--text-dim);
  text-align: center;
}

#empty-state .btn { pointer-events: all; }

/* ── Right panel ──────────────────────────────────────────────────────────── */
#panel-right {
  width: var(--right-w);
  background: linear-gradient(180deg, var(--surface2), var(--surface));
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 14px 12px;
  gap: 0;
  flex-shrink: 0;
  overflow-y: auto;
}

.panel-section-title {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  opacity: 0.7;
  margin-bottom: 6px;
}

#color-wheel {
  display: block;
  width: 100%;
  max-width: 200px;
  height: auto;
  aspect-ratio: 1;
  margin: 0 auto;
  cursor: crosshair;
}

.color-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

#current-color-swatch {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

#hex-input {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 12px;
  font-family: monospace;
  padding: 5px 8px;
  outline: none;
}

#hex-input:focus { border-color: var(--accent); }
#hex-input {
  -webkit-user-select: text;
  user-select: text;
  touch-action: auto;
}

/* ── Recent colors ────────────────────────────────────────────────────────── */
#recent-colors {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.recent-swatch {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.1);
  cursor: pointer;
  transition: transform 0.1s, border-color 0.1s;
}

.recent-swatch:hover { transform: scale(1.2); border-color: rgba(255,255,255,0.3); }

/* ── Panel slider rows ────────────────────────────────────────────────────── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-row label {
  font-size: 11px;
  color: var(--text-dim);
  flex: 0 0 58px;
}

.slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

.slider-row .val {
  font-size: 11px;
  color: var(--text-dim);
  text-align: right;
  flex: 0 0 28px;
}

.slider-row select {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 11px;
  padding: 4px 6px;
  cursor: pointer;
  outline: none;
}

.slider-row select:focus { border-color: var(--accent); }

/* make option background readable in dark mode */
.slider-row select option { background: var(--surface2); }

.right-divider {
  height: 1px;
  background: var(--border);
}

/* ── Image settings panel ─────────────────────────────────────────────────── */
#image-settings { display: flex; flex-direction: column; gap: 8px; }

/* ── Session dialog ───────────────────────────────────────────────────────── */
.dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.dialog-overlay.hidden { display: none; }

.dialog-box {
  background: linear-gradient(180deg, var(--surface2), var(--surface));
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 28px 32px;
  max-width: 340px;
  width: 90%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 24px 70px rgba(0,0,0,0.6);
}

.dialog-box h3 { font-size: 16px; font-weight: 600; }
.dialog-box p  { font-size: 13px; color: var(--text-dim); line-height: 1.5; }

.dialog-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.dialog-actions .btn { flex: 1; justify-content: center; }

/* ── Gallery modal ────────────────────────────────────────────────────────── */
.gallery-box {
  background: linear-gradient(180deg, var(--surface2), var(--surface));
  border: 1px solid var(--border);
  border-radius: 24px;
  width: min(860px, 94vw);
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 28px 90px rgba(0,0,0,0.75);
  overflow: hidden;
}

.gallery-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#gallery-tab-strip {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.gallery-tab {
  flex: 1;
  padding: 10px;
  font-size: 13px;
  font-weight: 600;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  letter-spacing: 0.3px;
}

.gallery-tab:hover:not(.active) { color: var(--text); }
.gallery-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.gallery-header h3 { font-size: 15px; font-weight: 600; }

#gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  padding: 16px;
  overflow-y: auto;
}

.gallery-thumb {
  background: linear-gradient(180deg, var(--surface2), var(--surface));
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
  display: flex;
  flex-direction: column;
}

.gallery-thumb:hover {
  border-color: rgba(202,255,56,0.55);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.5);
}

.gallery-thumb img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  display: block;
  background: #fff;
  padding: 8px;
}

.gallery-thumb-name {
  background: transparent;
  color: var(--text-dim);
  font-size: 10px;
  font-weight: 600;
  padding: 6px 8px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-top: 1px solid var(--border);
}

#gallery-empty {
  padding: 48px 20px;
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}

#gallery-empty.hidden { display: none; }

/* ── Scrollbar ────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Mode tabs (Kids / Pro) ───────────────────────────────────────────────── */
#mode-tabs {
  display: flex;
  margin: -14px -12px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.mode-tab {
  flex: 1;
  padding: 10px 6px;
  font-size: 12px;
  font-weight: 600;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  letter-spacing: 0.3px;
}

.mode-tab:hover:not(.active) { color: var(--text); }
.mode-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Kids panel ───────────────────────────────────────────────────────────── */
#panel-kids {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#panel-kids.hidden { display: none; }

#kids-swatches {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
}

.kids-swatch {
  aspect-ratio: 1;
  border-radius: 7px;
  border: 2px solid rgba(255,255,255,0.08);
  cursor: pointer;
  transition: transform 0.12s, border-color 0.12s, box-shadow 0.12s;
  min-height: 0;
}

.kids-swatch:hover  { transform: scale(1.18); }
.kids-swatch.active {
  border-color: #fff;
  box-shadow: 0 0 0 2px var(--accent);
  transform: scale(1.08);
}

/* Hue rainbow slider */
#hue-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

#hue-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 18px;
  border-radius: 9px;
  background: linear-gradient(to right,
    hsl(0,100%,50%), hsl(40,100%,50%), hsl(80,100%,50%),
    hsl(120,100%,50%), hsl(160,100%,50%), hsl(200,100%,50%),
    hsl(240,100%,50%), hsl(280,100%,50%), hsl(320,100%,50%),
    hsl(359,100%,50%));
  cursor: pointer;
  outline: none;
  border: none;
}

#hue-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.5);
  cursor: pointer;
}

#hue-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.5);
  cursor: pointer;
}

#hue-preview {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  border: 1px solid var(--border);
  flex-shrink: 0;
  background: hsl(0, 100%, 50%);
}

/* ── Pro panel ────────────────────────────────────────────────────────────── */
#panel-pro {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#panel-pro.hidden { display: none; }

/* ── Responsive: tablet ───────────────────────────────────────────────────── */
@media (max-width: 900px) {
  :root { --right-w: 200px; }
}

@media (max-width: 680px) {
  :root { --right-w: 0px; --panel-w: 56px; }
  #panel-right { display: none; }
  #toolbar .app-name { display: none; }
}