:root {
  --bg: #0b0e14;
  --panel: #121722;
  --ink: #e6edf3;
  --muted: #9aa4b2;
  --accent: #7aa2ff;
  --accent-2: #6ee7ff;
  --good: #5ee1a0;
  --warn: #ffd166;
  --danger: #ff7b7b;
  --grid: rgba(230,237,243,0.08);
}

html, body { 
  height: 100%; 
}

body {
  margin: 0; 
  background: var(--bg); 
  color: var(--ink);
  font: 14px/1.4 system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
}

header { 
  padding: 16px 20px; 
  border-bottom: 1px solid var(--grid); 
  background: linear-gradient(180deg, #0b0e14 0%, #0e1420 100%); 
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

header h1 { 
  font-size: 18px; 
  margin: 0; 
  font-weight: 600; 
}

.export-controls-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.export-controls-header input[type="text"] {
  width: 200px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--grid);
  background: #0f1522;
  color: var(--ink);
  font-size: 13px;
}

.export-controls-header .btn {
  padding: 8px 14px;
  font-size: 13px;
  white-space: nowrap;
}

.wrap { 
  display: grid; 
  grid-template-columns: 280px 1fr 280px; 
  gap: 16px; 
  padding: 16px; 
  height: calc(100% - 77px); 
  box-sizing: border-box; 
}

@media (max-width: 1200px) { 
  .wrap { 
    grid-template-columns: 1fr 1fr; 
    grid-template-rows: auto auto;
  }
  .data-panel {
    grid-column: 1;
    grid-row: 1;
  }
  .canvas-panel {
    grid-column: 2;
    grid-row: 1 / 3;
  }
  .controls-panel {
    grid-column: 1;
    grid-row: 2;
  }
}

@media (max-width: 768px) { 
  .wrap { 
    grid-template-columns: 1fr; 
    grid-template-rows: auto;
    height: auto; 
  }
  .data-panel,
  .canvas-panel,
  .controls-panel {
    grid-column: 1 !important;
    grid-row: auto !important;
  }
  .header-content {
    flex-direction: column;
    align-items: stretch;
  }
  .export-controls-header {
    justify-content: stretch;
  }
  .export-controls-header input[type="text"] {
    flex: 1;
  }
}

.panel {
  background: var(--panel); 
  border: 1px solid var(--grid); 
  border-radius: 14px; 
  overflow: hidden;
}

.panel h2 { 
  margin: 0; 
  padding: 12px 14px; 
  font-size: 14px; 
  font-weight: 600; 
  letter-spacing: 0.2px; 
  border-bottom: 1px solid var(--grid); 
  background: #0f1625; 
}

.panel .content { 
  padding: 12px 14px; 
}

label { 
  display: block; 
  margin: 10px 0 4px; 
  color: var(--muted); 
  font-size: 12px; 
}

input[type="text"], 
input[type="number"], 
select, 
textarea {
  width: 100%; 
  box-sizing: border-box; 
  border-radius: 10px; 
  border: 1px solid var(--grid);
  background: #0f1522; 
  color: var(--ink); 
  padding: 10px 12px; 
  outline: none;
}

textarea { 
  min-height: 160px; 
  resize: vertical; 
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; 
}

.row { 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: 10px; 
}

.toggles { 
  display: flex; 
  flex-direction: column;
  gap: 10px; 
  margin-bottom: 16px;
}

.toggles label { 
  display: inline-flex; 
  align-items: center; 
  gap: 8px; 
  margin: 0; 
}

.size-controls {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 12px;
  align-items: center;
}

.size-controls label {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

.size-controls input[type="range"] {
  width: 100%;
  padding: 0;
}

.btn {
  display: inline-flex; 
  align-items: center; 
  gap: 8px; 
  border-radius: 10px; 
  padding: 10px 12px; 
  cursor: pointer;
  border: 1px solid var(--grid); 
  background: #0f1625; 
  color: var(--ink); 
  text-decoration: none;
  font-size: 14px;
  transition: background 0.15s ease;
}

.btn:hover {
  background: #151d2e;
}

.footnote { 
  color: var(--muted); 
  font-size: 12px; 
  margin-top: 8px; 
}
.canvas-panel { 
  display: flex;
  flex-direction: column;
  min-height: 0; /* Allow flex shrinking */
}

.canvas-panel h2 {
  flex-shrink: 0;
}

.svg-wrap { 
  position: relative; 
  /* width and height are set via JS to keep it square within available space */
  max-width: 100%;
  overflow: hidden;
  flex-shrink: 0;
  margin: 0 auto; /* center horizontally */
}

svg { 
  position: absolute;
  top: 0;
  left: 0;
  width: 100%; 
  height: 100%; 
  display: block; 
  background: white;
  border: 1px solid var(--grid);
  border-radius: 8px;
}