/* ───────────────────────────────────────────────────────────────
   MARTES — light minimal theme
   Palette: white surfaces, ink text, single subtle accent.
─────────────────────────────────────────────────────────────── */

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

:root {
  --bg-main:        #ffffff;
  --bg-soft:        #fafafa;
  --bg-canvas:      #f4f4f5;
  --bg-panel:       #ffffff;
  --border:         rgba(0, 0, 0, 0.08);
  --border-strong:  rgba(0, 0, 0, 0.14);
  --text-primary:   #18181b;
  --text-muted:     rgba(24, 24, 27, 0.55);
  --text-faint:     rgba(24, 24, 27, 0.35);
  --accent:         #18181b;
  --accent-soft:    rgba(24, 24, 27, 0.06);
  --shadow:         0 1px 2px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
  --tab-h:          2.75rem;
  --sidebar-w:      13rem;
  --panel-w:        17rem;

  /* Font stacks — system-only, no custom fonts. */
  --font-sans:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif:     ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --font-mono:      ui-monospace, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background: var(--bg-main);
  color: var(--text-primary);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

/* ── Global focus ring — keyboard-only via :focus-visible ─────── */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── TAB BAR ─────────────────────────────────────────────────── */
.tabbar {
  height: var(--tab-h);
  background: var(--bg-main);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: stretch;
  padding: 0 0.5rem; gap: 0.25rem;
  flex-shrink: 0; z-index: 100;
}
.tab-logo {
  display: flex; align-items: center;
  padding: 0 1rem 0 0.5rem;
  font-size: 1rem; font-weight: 700; letter-spacing: -0.02em;
  color: var(--text-primary);
  border-right: 1px solid var(--border);
  margin-right: 0.5rem;
  user-select: none;
}
.tab-logo span { color: var(--text-faint); }

.tab-btn {
  display: flex; align-items: center; gap: 0.45rem;
  padding: 0 1rem;
  border: none; background: transparent;
  color: var(--text-muted);
  font-family: inherit; font-size: 0.8rem; font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  letter-spacing: 0.02em; white-space: nowrap;
}
.tab-btn:hover  { color: var(--text-primary); }
.tab-btn.active { color: var(--text-primary); border-bottom-color: var(--accent); }

/* ── APP SHELL ───────────────────────────────────────────────── */
.app { height: calc(100vh - var(--tab-h)); display: flex; overflow: hidden; }
.tab-panel { flex: 1; display: none; overflow: hidden; }
.tab-panel.active { display: flex; }
.full-iframe {
  width: 100%; height: 100%;
  border: none; display: block;
  background: var(--bg-main);
}

/* ── TEXTURE TAB ─────────────────────────────────────────────── */
#tab-textures { flex-direction: column; overflow: hidden; background: var(--bg-soft); }
.tex-toolbar {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-main);
  flex-shrink: 0; flex-wrap: wrap;
}
.tex-toolbar-title {
  font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.08em; color: var(--text-muted);
  text-transform: uppercase;
}
.tex-search {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-primary);
  font-family: inherit; font-size: 0.78rem;
  padding: 0.3rem 0.65rem; width: 180px; outline: none;
  transition: border-color 0.12s;
}
.tex-search:focus { border-color: var(--accent); }
.tex-sort-btn {
  background: var(--bg-main); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-muted);
  font-family: inherit; font-size: 0.72rem;
  padding: 0.3rem 0.7rem; cursor: pointer;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
  white-space: nowrap;
}
.tex-sort-btn:hover { color: var(--text-primary); border-color: var(--border-strong); }
.tex-sort-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.tex-spacer { flex: 1; }
.tex-count { font-size: 0.72rem; color: var(--text-muted); white-space: nowrap; }

/* ── TEXTURE GRID — auto columns 270–320px wide ──────────────── */
.tex-body { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-height: 0; }
.tex-grid {
  flex: 1 1 auto;
  min-height: 0;            /* allow shrinking inside flex parent without clipping items */
  overflow-y: auto;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  grid-auto-rows: max-content;  /* rows take only what their items need (aspect-ratio) */
  gap: 1rem;
  align-content: start;
}
.tex-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-main);
  border: 1px solid var(--border);
  aspect-ratio: 3 / 2;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.tex-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--border-strong);
  z-index: 2;
}
.tex-item img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; display: block;
}
.tex-num {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 0.65rem 0.85rem;
  font-size: 0.72rem; font-weight: 600;
  color: #fff;
  background: linear-gradient(transparent, rgba(0,0,0,0.55));
  text-align: left;
  opacity: 0; transition: opacity 0.15s;
  pointer-events: none;
  letter-spacing: 0.04em;
}
.tex-item:hover .tex-num { opacity: 1; }
.tex-dl-btn {
  position: absolute; top: 10px; right: 10px;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: rgba(255,255,255,0.95);
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s, color 0.15s, transform 0.15s;
  backdrop-filter: blur(4px);
}
.tex-item:hover .tex-dl-btn { opacity: 1; }
.tex-dl-btn:hover { background: var(--accent); color: #fff; transform: scale(1.06); }

/* ── PAGINATION ──────────────────────────────────────────────── */
.tex-pagination {
  display: flex; align-items: center; justify-content: center; gap: 0.35rem;
  padding: 0.85rem 1rem;
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  background: var(--bg-main);
  flex-wrap: wrap;
}
.tex-pg-btn {
  background: var(--bg-main); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-muted);
  font-family: inherit; font-size: 0.74rem; font-weight: 600;
  padding: 0.32rem 0.65rem; cursor: pointer;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
  min-width: 32px; text-align: center;
}
.tex-pg-btn:hover { color: var(--text-primary); border-color: var(--border-strong); }
.tex-pg-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.tex-pg-btn:disabled { opacity: 0.3; cursor: default; }
.tex-pg-ellipsis { color: var(--text-muted); font-size: 0.74rem; padding: 0 0.2rem; }

/* ── STUDIO LAYOUT (sidebar / canvas / panel) ────────────────── */
.studio-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--panel-w);
  width: 100%; height: 100%; overflow: hidden;
}

/* LEFT SIDEBAR */
.studio-sidebar {
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column; overflow: hidden;
}
.sidebar-head {
  padding: 0.85rem 1rem;
  font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.12em; color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  text-transform: uppercase;
}
.tool-list {
  flex: 1; overflow-y: auto;
  padding: 0.5rem;
  display: flex; flex-direction: column; gap: 0.15rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(0,0,0,0.18) transparent;
}
.tool-list::-webkit-scrollbar { width: 5px; }
.tool-list::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.18); border-radius: 9999px; }
.tool-cat {
  font-size: 0.6rem; font-weight: 700;
  letter-spacing: 0.12em; color: var(--text-faint);
  padding: 0.75rem 0.55rem 0.25rem;
  text-transform: uppercase;
}
.tool-btn {
  display: flex; align-items: center; gap: 0.55rem;
  width: 100%;
  padding: 0.45rem 0.65rem;
  border: 1px solid transparent;
  border-radius: 0.45rem;
  background: transparent;
  color: var(--text-muted);
  font-family: inherit; font-size: 0.78rem; font-weight: 600;
  cursor: pointer; text-align: left;
  transition: background 0.12s, color 0.12s;
}
.tool-btn:hover  { background: var(--accent-soft); color: var(--text-primary); }
.tool-btn.active { background: var(--accent); color: #fff; }
.tool-icon  {
  width: 1.1rem; height: 1.1rem;
  flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  color: currentColor;
}
.tool-icon svg { width: 100%; height: 100%; display: block; }
/* Card icon (right panel) — slightly larger */
.tool-card-name .tool-icon { width: 1.2rem; height: 1.2rem; }

/* CENTER CANVAS */
.studio-canvas {
  background: var(--bg-canvas);
  position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
#svgCanvas { display: block; background: #fff; box-shadow: var(--shadow); }

/* RIGHT PANEL */
.studio-panel {
  background: var(--bg-main);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column; overflow: hidden;
}
.panel-scroll {
  flex: 1; overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(0,0,0,0.18) transparent;
  min-height: 0;
}
.panel-scroll::-webkit-scrollbar { width: 5px; }
.panel-scroll::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.18); border-radius: 9999px; }

.p-section { border-bottom: 1px solid var(--border); }
.p-sec-head {
  padding: 0.8rem 1rem;
  font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.12em; color: var(--text-muted);
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; user-select: none;
  text-transform: uppercase;
}
.p-sec-head svg { transition: transform 0.2s; opacity: 0.45; }
.p-sec-head.collapsed svg { transform: rotate(-90deg); }
.p-sec-body { padding: 0 1rem 0.9rem; }
.p-sec-body.hidden { display: none; }

/* Controls */
.ctrl-row { margin-bottom: 0.75rem; }
.ctrl-label-row {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.4rem;
}
.ctrl-label { font-size: 0.72rem; color: var(--text-muted); font-weight: 500; }
.ctrl-val   { font-size: 0.72rem; color: var(--text-primary); font-weight: 600; min-width: 2.5rem; text-align: right; }

input[type="range"] {
  -webkit-appearance: none;
  width: 100%; height: 0.2rem;
  border-radius: 9999px;
  background: rgba(0,0,0,0.1);
  outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1rem; height: 1rem;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.18);
}

.color-row { display: flex; flex-direction: column; gap: 0.5rem; }
.color-item { display: flex; align-items: center; gap: 0.55rem; }
.color-swatch {
  width: 1.8rem; height: 1.8rem;
  border-radius: 0.35rem;
  border: 1px solid var(--border-strong);
  cursor: pointer; position: relative; flex-shrink: 0;
  transition: transform 0.12s;
  overflow: hidden;
}
.color-swatch:hover { transform: scale(1.08); }
.color-swatch input[type="color"] {
  opacity: 0; position: absolute; inset: 0;
  width: 100%; height: 100%;
  cursor: pointer; border: none; padding: 0;
}
.color-name { font-size: 0.72rem; color: var(--text-muted); font-weight: 500; }

.btn-group { display: flex; gap: 0.3rem; flex-wrap: wrap; }
.btn-opt {
  flex: 1; min-width: 2rem;
  padding: 0.35rem 0.3rem;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--bg-main);
  color: var(--text-muted);
  cursor: pointer;
  font-family: inherit; font-size: 0.66rem; font-weight: 600;
  text-align: center; white-space: nowrap;
  transition: all 0.12s;
}
.btn-opt:hover  { background: var(--accent-soft); color: var(--text-primary); }
.btn-opt.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.toggle-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.65rem; }
.toggle-label { font-size: 0.72rem; color: var(--text-muted); font-weight: 500; }
.toggle { position: relative; width: 2.4rem; height: 1.3rem; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-track {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.15);
  border-radius: 9999px;
  cursor: pointer; transition: background 0.2s;
}
.toggle input:checked + .toggle-track { background: var(--accent); }
.toggle-track::after {
  content: ''; position: absolute;
  width: 1rem; height: 1rem;
  border-radius: 50%; background: #fff;
  top: 50%; left: 0.15rem;
  transform: translateY(-50%);
  transition: left 0.2s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.18);
}
.toggle input:checked + .toggle-track::after { left: 1.25rem; }

.select-input {
  width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  color: var(--text-primary);
  font-family: inherit; font-size: 0.78rem; font-weight: 600;
  padding: 0.5rem 2rem 0.5rem 0.7rem;
  outline: none; cursor: pointer;
  -webkit-appearance: none; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2318181b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.7rem center;
  transition: border-color 0.12s;
}
.select-input:hover { border-color: var(--border-strong); }
.select-input:focus { border-color: var(--accent); }

.tool-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.7rem 0.8rem;
  margin-bottom: 0.55rem;
}
.tool-card-name { font-size: 0.85rem; font-weight: 700; margin-bottom: 0.25rem; }
.tool-card-desc { font-size: 0.7rem; color: var(--text-muted); line-height: 1.55; }
.tool-tag {
  display: inline-block;
  font-size: 0.58rem; font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.4rem;
  border-radius: 0.25rem;
  background: var(--accent-soft);
  color: var(--text-primary);
  border: 1px solid var(--border);
  margin-left: 0.4rem;
  vertical-align: middle;
}

.panel-actions {
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg-main);
  flex-shrink: 0;
  display: flex; flex-direction: column; gap: 0.55rem;
}
.action-head {
  font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  text-transform: uppercase;
}
/* Two-row layout: Randomize full width on top, the three export buttons below. */
.action-btns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
}
.action-btns .act-btn.randomize { grid-column: 1 / -1; }
.act-btn {
  min-width: 0;
  padding: 0.55rem 0.3rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  cursor: pointer;
  font-family: inherit; font-size: 0.74rem; font-weight: 700;
  transition: all 0.15s;
  display: flex; align-items: center; justify-content: center; gap: 0.35rem;
}
.act-btn:hover  { transform: translateY(-1px); }
.act-btn:active { transform: scale(0.97); }
.act-btn.randomize { background: var(--bg-main); color: var(--text-primary); }
.act-btn.randomize:hover { background: var(--accent-soft); }
.act-btn.save      { background: var(--accent); color: #fff; border-color: var(--accent); }
.act-btn.save:hover{ box-shadow: var(--shadow); }
.act-btn.copy      { background: var(--bg-soft); color: var(--text-primary); }
.act-btn.copy:hover{ background: var(--accent-soft); }
.act-btn.png       { background: var(--bg-soft); color: var(--text-primary); }
.act-btn.png:hover { background: var(--accent-soft); }
.act-btn:disabled  { opacity: 0.35; cursor: not-allowed; transform: none; }

.sec-tool-hint {
  padding: 0.5rem 0;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.section-divider {
  font-size: 0.6rem; font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  margin-bottom: 0.5rem; margin-top: 0.15rem;
  display: block; text-transform: uppercase;
}

/* ── Palette dropdown ────────────────────────────────────────── */
.palette-dropdown { position: relative; }
.palette-dropdown-btn {
  display: flex; align-items: center; gap: 0.55rem;
  width: 100%;
  padding: 0.45rem 0.6rem 0.45rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg-main);
  color: var(--text-primary);
  font-family: inherit; font-size: 0.78rem; font-weight: 600;
  cursor: pointer;
  transition: border-color 0.12s;
}
.palette-dropdown-btn:hover { border-color: var(--border-strong); }
.palette-dropdown.open > .palette-dropdown-btn { border-color: var(--accent); }
.palette-dropdown-swatches {
  display: inline-flex; flex-shrink: 0;
  gap: 0;
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--border-strong);
}
.palette-dropdown-swatches > i {
  display: block;
  width: 12px; height: 14px;
}
.palette-dropdown-label  { flex: 1; text-align: left; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.palette-dropdown-btn svg { flex-shrink: 0; opacity: 0.5; transition: transform 0.2s; }
.palette-dropdown.open > .palette-dropdown-btn svg { transform: rotate(180deg); }

.palette-dropdown-panel {
  position: absolute; top: calc(100% + 4px); left: 0; right: 0;
  z-index: 20;
  background: var(--bg-main);
  border: 1px solid var(--border-strong);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
  padding: 0.5rem;
  display: flex; flex-direction: column; gap: 0.4rem;
  max-height: 360px;
}
/* `display: flex` above overrides the UA `[hidden] { display: none }`,
   so we re-establish the hide rule for the panel explicitly. */
.palette-dropdown-panel[hidden] { display: none; }
.palette-dropdown-search {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--bg-soft);
  color: var(--text-primary);
  font-family: inherit; font-size: 0.74rem;
  padding: 0.4rem 0.55rem;
  outline: none;
  transition: border-color 0.12s;
}
.palette-dropdown-search:focus { border-color: var(--accent); }
.palette-dropdown-list {
  flex: 1; min-height: 0;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 0.25rem;
  scrollbar-width: thin;
}
.palette-dropdown-list::-webkit-scrollbar { width: 5px; }
.palette-dropdown-list::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.18); border-radius: 9999px; }

.palette-row {
  display: flex; align-items: center; gap: 0.45rem;
  padding: 0.32rem 0.4rem;
  border: 1px solid transparent;
  border-radius: 0.4rem;
  background: transparent;
  cursor: pointer;
  font-family: inherit; font-size: 0.7rem;
  color: var(--text-muted);
  transition: background 0.12s, color 0.12s;
}
.palette-row:hover,
.palette-row.focused { background: var(--accent-soft); color: var(--text-primary); }
.palette-row.focused { outline: 2px solid var(--accent); outline-offset: -2px; }
.palette-row.active {
  background: var(--accent-soft);
  border-color: var(--border-strong);
  color: var(--text-primary);
}
.palette-row-swatches {
  display: inline-flex;
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--border-strong);
}
.palette-row-swatches > i {
  display: block;
  width: 18px; height: 22px;
}
.palette-row-num { flex: 1; text-align: right; color: var(--text-faint); font-feature-settings: 'tnum'; }
.palette-empty { text-align: center; font-size: 0.7rem; color: var(--text-faint); padding: 0.8rem 0; }

/* ── SVG Shape Picker (single) ───────────────────────────────── */
.shape-picker { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0.35rem; margin-bottom: 0.55rem; }
.shape-pick-btn {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--bg-main);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  padding: 0.25rem;
  transition: all 0.12s;
  color: var(--text-primary);
}
.shape-pick-btn:hover  { background: var(--accent-soft); border-color: var(--border-strong); }
.shape-pick-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.shape-pick-btn svg { width: 100%; height: 100%; }
.shape-custom-area { margin-top: 0.45rem; }
.shape-custom-label { font-size: 0.66rem; color: var(--text-muted); margin-bottom: 0.35rem; display: block; }
.shape-custom-input {
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  padding: 0.5rem 0.6rem;
  resize: vertical; min-height: 3.5rem;
  outline: none; line-height: 1.55;
}
.shape-custom-input:focus { border-color: var(--accent); background: var(--bg-main); }
.shape-custom-input.error { border-color: #dc2626; }
.shape-custom-hint { font-size: 0.6rem; color: var(--text-faint); margin-top: 0.3rem; line-height: 1.45; }

/* ── bbburst multi-shape picker ──────────────────────────────── */
.bb-shape-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.35rem; margin-bottom: 0.55rem; }
.bb-shape-btn {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--bg-main);
  cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.15rem;
  padding: 0.3rem 0.15rem;
  transition: all 0.12s;
  position: relative;
  color: var(--text-primary);
}
.bb-shape-btn:hover  { background: var(--accent-soft); border-color: var(--border-strong); }
.bb-shape-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.bb-shape-btn svg { width: 70%; height: 70%; flex-shrink: 0; }
.bb-shape-btn span { font-size: 0.5rem; color: var(--text-muted); text-align: center; line-height: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; width: 100%; padding: 0 2px; }
.bb-shape-btn.active span { color: rgba(255,255,255,0.85); }
.bb-shape-btn .bb-check { position:absolute; top:2px; right:4px; font-size:0.6rem; color:#fff; display:none; }
.bb-shape-btn.active .bb-check { display:block; }
.bb-custom-shapes { margin-top: 0.55rem; }
.bb-custom-head { display:flex; align-items:center; justify-content:space-between; margin-bottom:0.4rem; }
.bb-custom-title { font-size:0.66rem; color:var(--text-muted); font-weight:600; }
.bb-add-btn {
  font-size:0.62rem; padding:0.22rem 0.55rem;
  border:1px solid var(--border); border-radius:0.35rem;
  background:var(--bg-main); color:var(--text-muted);
  cursor:pointer; font-family:inherit; transition:all 0.12s;
}
.bb-add-btn:hover { background:var(--accent-soft); color:var(--text-primary); }
.bb-custom-list { display:flex; flex-direction:column; gap:0.4rem; }
.bb-custom-item {
  background:var(--bg-soft); border:1px solid var(--border);
  border-radius:0.45rem; padding:0.45rem 0.55rem;
  display:flex; flex-direction:column; gap:0.35rem;
}
.bb-custom-item-head { display:flex; align-items:center; gap:0.45rem; }
.bb-custom-item-label { font-size:0.64rem; color:var(--text-muted); flex:1; }
.bb-custom-item-del {
  font-size:0.75rem; background:none; border:none;
  color:#dc2626; opacity:0.7; cursor:pointer; padding:0; line-height:1;
}
.bb-custom-item-del:hover { opacity:1; }
.bb-custom-path {
  width:100%; background:var(--bg-main); border:1px solid var(--border);
  border-radius:0.35rem; color:var(--text-primary);
  font-family: var(--font-mono); font-size:0.62rem;
  padding:0.4rem 0.45rem; resize:none; height:3.4rem;
  outline:none; line-height:1.45;
}
.bb-custom-path:focus { border-color:var(--accent); }
.bb-custom-toggles { display:flex; gap:0.55rem; align-items:center; }
.bb-custom-lbl {
  font-size:0.62rem; color:var(--text-muted);
  display:flex; align-items:center; gap:0.3rem; cursor:pointer;
}
.bb-custom-lbl input { accent-color:var(--accent); cursor:pointer; }

/* ── mmmotif shape picker ────────────────────────────────────── */
.mm-shape-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.35rem; margin-bottom: 0.55rem; }
.mm-shape-btn {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--bg-main);
  cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.15rem;
  padding: 0.25rem 0.15rem;
  transition: all 0.12s;
  position: relative;
  overflow: hidden;
  color: var(--text-primary);
}
.mm-shape-btn:hover  { background: var(--accent-soft); border-color: var(--border-strong); }
.mm-shape-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.mm-shape-btn svg { width: 75%; height: 75%; flex-shrink: 0; }
.mm-shape-btn span { font-size: 0.48rem; color: var(--text-muted); text-align: center; line-height: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; width: 100%; padding: 0 2px; }
.mm-shape-btn.active span { color: rgba(255,255,255,0.85); }
.mm-shape-btn .mm-check { position:absolute; top:2px; right:4px; font-size:0.55rem; color:#fff; display:none; }
.mm-shape-btn.active .mm-check { display:block; }
.mm-custom-shapes { margin-top: 0.55rem; }
.mm-custom-head { display:flex; align-items:center; justify-content:space-between; margin-bottom:0.4rem; }
.mm-custom-title { font-size:0.66rem; color:var(--text-muted); font-weight:600; }
.mm-add-btn {
  font-size:0.62rem; padding:0.22rem 0.55rem;
  border:1px solid var(--border); border-radius:0.35rem;
  background:var(--bg-main); color:var(--text-muted);
  cursor:pointer; font-family:inherit; transition:all 0.12s;
}
.mm-add-btn:hover { background:var(--accent-soft); color:var(--text-primary); }
.mm-custom-list { display:flex; flex-direction:column; gap:0.4rem; }
.mm-custom-item {
  background:var(--bg-soft); border:1px solid var(--border);
  border-radius:0.45rem; padding:0.45rem 0.55rem;
  display:flex; flex-direction:column; gap:0.35rem;
}
.mm-custom-item-head { display:flex; align-items:center; gap:0.45rem; }
.mm-custom-item-label { font-size:0.64rem; color:var(--text-muted); flex:1; }
.mm-custom-item-del {
  font-size:0.75rem; background:none; border:none;
  color:#dc2626; opacity:0.7; cursor:pointer; padding:0; line-height:1;
}
.mm-custom-item-del:hover { opacity:1; }
.mm-custom-path {
  width:100%; background:var(--bg-main); border:1px solid var(--border);
  border-radius:0.35rem; color:var(--text-primary);
  font-family: var(--font-mono); font-size:0.62rem;
  padding:0.4rem 0.45rem; resize:none; height:3.4rem;
  outline:none; line-height:1.45;
}
.mm-custom-path:focus { border-color:var(--accent); }
.mm-custom-hint { font-size:0.6rem; color:var(--text-faint); line-height:1.45; margin-top:0.25rem; }

/* ── HAMBURGER BUTTON (hidden on desktop) ───────────────────── */
.sidebar-toggle {
  display: none;
  align-items: center; justify-content: center;
  width: 2.2rem; height: 2.2rem;
  border: none; background: transparent;
  cursor: pointer; color: var(--text-primary);
  padding: 0; flex-shrink: 0;
}
.sidebar-toggle svg { display: block; }

/* Sidebar backdrop overlay (mobile) */
.sidebar-backdrop {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 199;
  backdrop-filter: blur(2px);
}
.sidebar-backdrop.visible { display: block; }

/* ── RESPONSIVE: < 1024px — collapsible sidebar ──────────────── */
@media (max-width: 1024px) {
  .sidebar-toggle { display: flex; }

  .studio-layout {
    grid-template-columns: 1fr var(--panel-w);
  }

  .studio-sidebar {
    position: fixed;
    left: 0; top: var(--tab-h); bottom: 0;
    width: var(--sidebar-w);
    z-index: 200;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 4px 0 16px rgba(0,0,0,0.08);
  }
  .studio-sidebar.open {
    transform: translateX(0);
  }
}

/* ── RESPONSIVE: < 768px — panel below canvas ────────────────── */
@media (max-width: 768px) {
  .studio-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }

  .studio-canvas {
    min-height: 50vh;
  }

  .studio-panel {
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 40vh;
    overflow-y: auto;
  }

  /* Textures — single column on narrow screens */
  .tex-grid {
    grid-template-columns: 1fr;
  }

  /* Larger touch targets */
  .tool-btn { padding: 0.6rem 0.75rem; min-height: 2.75rem; }
  .act-btn  { padding: 0.65rem 0.5rem; min-height: 2.75rem; }
  .tab-btn  { padding: 0 0.75rem; }
}

/* ── RESPONSIVE: < 480px — tighter spacing ──────────────────── */
@media (max-width: 480px) {
  :root {
    --panel-w: 100%;
  }
  .tabbar { padding: 0 0.25rem; }
  .tab-logo { padding: 0 0.5rem 0 0.25rem; font-size: 0.9rem; }
  .tex-toolbar { padding: 0.5rem 0.75rem; gap: 0.4rem; }
  .tex-search { width: 120px; }
  .tex-grid { padding: 0.75rem; gap: 0.5rem; }
}

/* ── RESPECT REDUCED MOTION ─────────────────────────────────────
   Users with OS-level "Reduce motion" get instant state changes
   instead of slides/scales/transitions. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}