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

:root {
  /* shadcn/ui dark — Zinc scale */
  --bg:         #09090B;   /* zinc-950 */
  --bg-panel:   #18181B;   /* zinc-900 */
  --bg-deep:    #050507;   /* deeper than zinc-950 */
  --bg-input:   #18181B;   /* zinc-900 */
  --border:     #27272A;   /* zinc-800 */
  --border-sub: #18181B;   /* zinc-900 */
  --text:       #FAFAFA;   /* zinc-50 */
  --text-muted: #A1A1AA;   /* zinc-400 */
  --text-dim:   #52525B;   /* zinc-600 */
  --accent:     #FAFAFA;   /* shadcn primary = white on dark */
  --accent-fg:  #18181B;   /* zinc-900 */
  --primary:    #FAFAFA;
  --primary-fg: #18181B;
  --font-mono:  'JetBrains Mono', monospace;
  --font-sans:  'Inter', 'IBM Plex Sans', sans-serif;
  --radius:     6px;       /* shadcn default --radius */
}

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

/* ── Layout ────────────────────────────────────────────────── */
#topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 48px;
  padding: 0 16px;
  background: #18181B;
  border-bottom: 1px solid #27272A;
  flex-shrink: 0;
}

#body {
  display: flex;
  height: calc(100vh - 48px);
  overflow: hidden;
}

/* ── Topbar ────────────────────────────────────────────────── */
#logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.5px;
  text-shadow: none;
}

#topbar-hint {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Topbar divider */
#topbar > .divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

/* ── Left Panel ────────────────────────────────────────────── */
#left-panel {
  width: 300px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
}

.panel-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel-section--grow {
  flex: 1;
  overflow: hidden;
  border-bottom: none;
}

/* ── Section Header ────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.7px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 150ms, color 150ms, border-color 150ms, opacity 150ms;
  white-space: nowrap;
}

.btn:active { opacity: 0.85; }

.btn-primary {
  background: var(--primary);
  color: var(--primary-fg);
  border-color: var(--primary);
}
.btn-primary:hover { background: #E4E4E7; border-color: #E4E4E7; color: #18181B; }

.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}
.btn-outline:hover { background: #27272A; color: var(--text); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}
.btn-ghost:hover { background: #27272A; color: var(--text); }

.btn-sm { padding: 4px 10px; font-size: 12px; }

.btn-full { width: 100%; justify-content: center; }

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

.btn-row {
  display: flex;
  gap: 8px;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  transition: opacity 150ms;
}
.link-btn:hover { opacity: 0.75; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius);
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  transition: background 150ms, color 150ms;
}
.icon-btn:hover { background: #27272A; color: var(--text); }

/* ── Textarea ──────────────────────────────────────────────── */
#svg-input {
  width: 100%;
  height: 110px;
  resize: none;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  padding: 10px 12px;
  outline: none;
  transition: border-color 150ms;
}
#svg-input:focus { border-color: var(--accent); }
#svg-input::placeholder { color: var(--text-dim); }

/* ── Chip row ──────────────────────────────────────────────── */
#chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 26px;
  max-height: 88px;
  overflow-y: auto;
  align-items: flex-start;
  align-content: flex-start;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 9px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  background: var(--accent);
  color: var(--accent-fg);
  cursor: default;
}

.chip-remove {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  opacity: 0.7;
  background: none;
  border: none;
  color: inherit;
  padding: 0;
  line-height: 1;
}
.chip-remove:hover { opacity: 1; }

.empty-hint {
  font-size: 12px;
  color: var(--text-dim);
  font-style: italic;
}

/* ── Attr target ───────────────────────────────────────────── */
#attr-target {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  background: var(--bg-input);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

/* ── Fields ────────────────────────────────────────────────── */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

.field-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 10px;
  outline: none;
  transition: border-color 150ms;
}
.field-input:focus { border-color: var(--accent); }
.field-input::placeholder { color: var(--text-dim); }

/* ── SVG Code Editor (output textarea) ─────────────────────── */
#svg-output-code {
  flex: 1;
  width: 100%;
  resize: none;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.7;
  padding: 10px 12px;
  outline: none;
  transition: border-color 150ms;
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}
#svg-output-code:focus { border-color: var(--accent); }
#svg-output-code::placeholder { color: var(--text-dim); }

/* ── Main Area ─────────────────────────────────────────────── */
#main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-deep);
}

#preview-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 40px;
  padding: 0 16px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#toolbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

#zoom-level {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  min-width: 36px;
  text-align: center;
}

/* ── Canvas ────────────────────────────────────────────────── */
#canvas-wrap {
  flex: 1;
  overflow: hidden;
  position: relative;
  /* infinite checkerboard — stays fixed while content pans */
  background-color: #09090B;
  background-image:
    linear-gradient(45deg, #18181B 25%, transparent 25%),
    linear-gradient(-45deg, #18181B 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #18181B 75%),
    linear-gradient(-45deg, transparent 75%, #18181B 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  cursor: default;
}

/* transform container — panned & zoomed via JS */
#canvas-bg {
  position: absolute;
  top: 0; left: 0;
  transform-origin: 0 0;
  /* size is irrelevant — content dictates it */
}

#canvas-empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-dim);
  font-size: 13px;
  pointer-events: none;
  white-space: nowrap;
}
#canvas-empty-state strong { color: var(--text-muted); }
#canvas-empty-state.hidden { display: none; }

#svg-viewport {
  display: none;
}
#svg-viewport.visible { display: block; }

/* ── SVG Interactive ───────────────────────────────────────── */
#svg-viewport svg {
  display: block;
}

#svg-viewport svg * {
  cursor: pointer;
  transition: outline 80ms;
}

.svg-hover {
  outline: 1.5px dashed #A1A1AA88 !important;
  outline-offset: 2px;
}

.svg-selected {
  outline: 2px solid #FAFAFA !important;
  outline-offset: 2px;
}

/* ── Scrollbars ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* ── Toast ─────────────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--accent);
  color: var(--accent-fg);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius);
  box-shadow: 0 4px 20px #00000066;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 200ms, transform 200ms;
  pointer-events: none;
  z-index: 9999;
}
#toast.show { opacity: 1; transform: translateY(0); }

/* ── Right Panel (Element Tree) ────────────────────────────── */
#right-panel {
  width: 220px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  order: 3;
}

#tree-root {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 6px 0;
}

.tree-empty {
  padding: 16px 14px;
  font-size: 11px;
  color: var(--text-dim);
  font-style: italic;
}

/* Tree node row */
.tree-node {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  cursor: pointer;
  user-select: none;
  border-radius: 4px;
  margin: 0 4px;
  transition: background 100ms;
  white-space: nowrap;
  overflow: hidden;
}
.tree-node:hover { background: #27272A; }
.tree-node.selected { background: #27272A; }
.tree-node.selected .tree-tag { color: var(--text); }

.tree-indent {
  display: inline-block;
  width: 14px;
  flex-shrink: 0;
}

.tree-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--text-dim);
  transition: transform 150ms;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.tree-toggle.open { transform: rotate(90deg); }
.tree-toggle.leaf { cursor: default; color: transparent; }

.tree-icon {
  flex-shrink: 0;
  color: var(--text-dim);
}

.tree-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.tree-tag .tree-attr {
  color: var(--text-dim);
  font-size: 10px;
}

.tree-children { }
.tree-children.collapsed { display: none; }

/* ── Topbar divider ────────────────────────────────────────── */
.topbar-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

/* ── Undo/Redo disabled state ──────────────────────────────── */
.icon-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.icon-btn:disabled:hover { background: transparent; }

/* ── Pan cursor ────────────────────────────────────────────── */
#canvas-wrap.panning         { cursor: grabbing !important; }
#canvas-wrap.pan-ready       { cursor: grab; }
#canvas-wrap.pan-ready #svg-viewport svg * { cursor: grab; }

/* ── Rulers ────────────────────────────────────────────────── */
#ruler-h {
  position: absolute;
  top: 0; left: 16px; right: 0;
  height: 16px;
  z-index: 50;
  pointer-events: none;
  display: block;
}
#ruler-v {
  position: absolute;
  top: 16px; left: 0; bottom: 0;
  width: 16px;
  z-index: 50;
  pointer-events: none;
  display: block;
}
#ruler-corner {
  position: absolute;
  top: 0; left: 0;
  width: 16px; height: 16px;
  background: #18181B;
  border-right: 1px solid #27272A;
  border-bottom: 1px solid #27272A;
  z-index: 51;
  pointer-events: none;
}

/* ── Marquee selection rect ────────────────────────────────── */
#marquee-rect {
  position: absolute;
  border: 1.5px solid #FAFAFA;
  background: #FAFAFA12;
  pointer-events: none;
  display: none;
  z-index: 100;
}

/* ── Color Pickers ─────────────────────────────────────────── */
.color-row {
  display: flex;
  gap: 12px;
}

.color-field {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.color-input-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 8px;
  transition: border-color 150ms;
}
.color-input-wrap:focus-within { border-color: var(--accent); }

input[type="color"] {
  width: 28px;
  height: 22px;
  border: none;
  border-radius: 3px;
  padding: 0;
  cursor: pointer;
  background: none;
  flex-shrink: 0;
}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 3px; }

.none-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  padding: 0 2px;
  line-height: 1;
  transition: color 150ms;
  flex-shrink: 0;
}
.none-btn:hover { color: var(--text-muted); }
.none-btn.active { color: var(--accent); }

/* ── Opacity row ───────────────────────────────────────────── */
.opacity-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

#attr-opacity-range {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

.opacity-number {
  width: 54px;
  flex-shrink: 0;
  padding: 6px 8px;
  text-align: right;
}

/* ── Modals ────────────────────────────────────────────────── */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: #00000088;
  z-index: 1000;
  align-items: center;
  justify-content: center;
}
.modal-backdrop.open { display: flex; }

.modal-box {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 520px;
  max-width: calc(100vw - 48px);
  max-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 64px #00000066;
}

.modal-box--wide {
  width: 760px;
  height: 560px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

#modal-code-area {
  flex: 1;
  resize: none;
  background: var(--bg-input);
  border: none;
  border-radius: 0 0 10px 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  padding: 14px 16px;
  outline: none;
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}

/* ── Shortcuts list ────────────────────────────────────────── */
.shortcuts-list {
  padding: 12px 16px 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.shortcut-group-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 14px;
  margin-bottom: 4px;
}
.shortcut-group-label:first-child { margin-top: 0; }

.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 8px;
  border-radius: 4px;
  gap: 12px;
}
.shortcut-row:hover { background: #27272A; }

.shortcut-desc {
  font-size: 13px;
  color: var(--text-muted);
}

kbd {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px 7px;
  background: #27272A;
  border: 1px solid #3F3F46;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Tree action buttons (hide / lock) ─────────────────────── */
.tree-actions {
  display: none;
  align-items: center;
  gap: 2px;
  margin-left: auto;
  flex-shrink: 0;
}
.tree-node:hover .tree-actions { display: flex; }
.tree-node.el-hidden .tree-actions,
.tree-node.el-locked .tree-actions { display: flex; }

.tree-action-btn {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-dim);
  padding: 0;
  border-radius: 3px;
  transition: color 150ms;
}
.tree-action-btn:hover { color: var(--text-muted); }
.tree-action-btn.active { color: var(--accent); }

/* Hidden / locked visual states */
.tree-node.el-hidden .tree-tag { opacity: 0.35; }
.svg-hidden { visibility: hidden; }

.tree-node.el-locked .tree-tag { opacity: 0.55; }
.svg-locked { pointer-events: none !important; cursor: default !important; }