:root {
  --indigo: #6366f1;
  --indigo-dark: #4338ca;
  --indigo-deep: #1e3a8a;
  --indigo-bg: #eef2ff;
  --ink: #1f2937;
  --gray-bg: #f9fafb;
  --gray-border: #e5e7eb;
  --gray-input: #f3f4f6;
  --gray-text: #6b7280;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--gray-bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

.page-header {
  padding: 18px 28px 8px;
  border-bottom: 1px solid var(--gray-border);
  background: var(--white);
}
.page-header h1 {
  margin: 0;
  font-size: 22px;
  color: #111827;
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section {
  background: var(--white);
  border: 1px solid var(--gray-border);
  border-radius: 10px;
  padding: 14px 18px;
  box-shadow: var(--shadow-sm);
}

.section-header {
  margin: 0 0 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--indigo-dark);
}

/* ============ Customizations row ============ */
.customizations-row {
  display: grid;
  grid-template-columns: 1.2fr 2.15fr 2.15fr;
  gap: 16px;
  align-items: stretch;
}

.custom-panel {
  border: 1px solid var(--gray-border);
  border-radius: 8px;
  padding: 14px 16px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--white);
  min-width: 0; /* Prevents overflow in flex/grid */
}

.custom-panel legend {
  font-size: 11px;
  font-weight: 700;
  color: var(--indigo-dark);
  letter-spacing: 0.06em;
  padding: 0 6px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
[hidden] { display: none !important; }

.face-select-row {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.face-select-row select {
  width: 100%;
}
.identify-label {
  font-size: 12px;
  color: var(--gray-text);
  white-space: nowrap;
}
.field-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--gray-text);
  letter-spacing: 0.04em;
}

.text-fields-row {
  display: flex;
  gap: 12px;
}
.text-fields-row .field {
  flex: 1;
  min-width: 0;
}
.text-fields-row .field input,
.text-fields-row .field select {
  width: 100%;
}

.font-size-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.range-num-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}
.range-num-wrap input[type="range"] {
  flex: 1;
  min-width: 50px;
  accent-color: var(--indigo);
}
.range-num-wrap input[type="number"] {
  width: 54px;
  padding: 4px 6px;
  border: 1px solid var(--gray-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 12px;
}

.field input[type="text"],
.field select,
.shape-row select {
  font-size: 14px;
  padding: 7px 10px;
  border: 1px solid var(--gray-border);
  border-radius: 6px;
  background: var(--white);
  color: var(--ink);
  font-family: inherit;
}
.field input[type="text"]:focus,
.field select:focus,
.shape-row select:focus {
  outline: 2px solid var(--indigo);
  outline-offset: 1px;
}

.inline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}
.inline input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin: 0;
  border: 1.5px solid #9ca3af;
  border-radius: 4px;
  background: var(--white);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.inline input[type="checkbox"]:hover {
  border-color: var(--indigo);
}
.inline input[type="checkbox"]:checked {
  background-color: var(--indigo);
  border-color: var(--indigo);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M2.5 6.2 L4.8 8.5 L9.5 3.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 12px;
}
.inline input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--indigo);
  outline-offset: 2px;
}

.hole-row {
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: 100%;
  justify-content: space-between;
}

.hole-position {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.hole-grid-wrap {
  display: flex;
  align-items: center;
  min-height: 60px;
}
.hole-grid {
  display: grid;
  grid-template-columns: repeat(3, 16px);
  grid-auto-rows: 16px;
  gap: 3px;
}
.hole-grid button {
  background: var(--white);
  border: 1px solid #9ca3af;
  border-radius: 2px;
  cursor: pointer;
  padding: 0;
}
.hole-grid button:hover {
  border-color: var(--indigo-dark);
}
.hole-grid button.selected {
  background: var(--indigo);
  border-color: var(--indigo-dark);
}

/* Circular position picker, used for round-footprint shapes (cylinder,
   sphere). The 9 dots sit on a circle so corner positions read correctly —
   they map onto the disc instead of a square. */
.hole-circle {
  position: relative;
  width: 60px;
  height: 60px;
}
.hole-circle button {
  position: absolute;
  width: 13px;
  height: 13px;
  margin: 0;
  padding: 0;
  background: var(--white);
  border: 1px solid #9ca3af;
  border-radius: 50%;
  cursor: pointer;
  transform: translate(-50%, -50%);
}
.hole-circle button:hover {
  border-color: var(--indigo-dark);
}
.hole-circle button.selected {
  background: var(--indigo);
  border-color: var(--indigo-dark);
}
/* Dot positions: center, the 4 compass edges on the rim, and the 4 corners
   at 45° (rim radius × 0.707) so they stay on the circle. */
.hole-circle button[data-pos="center"]        { left: 50%; top: 50%; }
.hole-circle button[data-pos="top-center"]    { left: 50%; top: 8%; }
.hole-circle button[data-pos="bottom-center"] { left: 50%; top: 92%; }
.hole-circle button[data-pos="middle-left"]   { left: 8%;  top: 50%; }
.hole-circle button[data-pos="middle-right"]  { left: 92%; top: 50%; }
.hole-circle button[data-pos="top-left"]      { left: 20%; top: 20%; }
.hole-circle button[data-pos="top-right"]     { left: 80%; top: 20%; }
.hole-circle button[data-pos="bottom-left"]   { left: 20%; top: 80%; }
.hole-circle button[data-pos="bottom-right"]  { left: 80%; top: 80%; }

/* Shown in place of the 3×3 grid when the body is a Star — the hole is
   always centered (arms are too narrow to hold it), so there's nothing
   to pick. */
.hole-centered-note {
  font-size: 11px;
  font-style: italic;
  color: var(--gray-text);
}

.inline-slider {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--gray-text);
  width: 100%;
}
.inline-slider input[type="range"] {
  flex: 1;
  min-width: 50px;
  accent-color: var(--indigo);
}
.inline-slider input[type="number"] {
  width: 54px;
  padding: 3px 6px;
  border: 1px solid var(--gray-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 12px;
}

/* ============ Preview row (canvas + height slider) ============ */
.preview-row {
  display: grid;
  grid-template-columns: 1fr 180px;
  gap: 16px;
  align-items: stretch;
}

.section-preview {
  padding: 14px 18px 18px;
}

.preview-container {
  position: relative;
  background: var(--indigo-bg);
  border: 2px solid var(--indigo-dark);
  border-radius: 8px;
  overflow: hidden;
  height: 420px;
}
#preview-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Overlay shown over the preview while a rebuild is pending or running */
.preview-overlay {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(67, 56, 202, 0.55);
  color: white;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.04em;
  z-index: 4;
  pointer-events: none;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}
.preview-overlay.active { display: flex; }
.preview-overlay .spinner {
  width: 36px;
  height: 36px;
  border: 4px solid rgba(255, 255, 255, 0.35);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: km-spin 0.9s linear infinite;
}
@keyframes km-spin {
  to { transform: rotate(360deg); }
}

/* "Identify" face labels overlaid on the preview */
.identify-overlay {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 3;
  display: none;
}
.identify-face-label {
  position: absolute;
  transform: translate(-50%, -50%);
  background: rgba(30, 58, 138, 0.9);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  border-radius: 999px;
  white-space: nowrap;
  pointer-events: none;
}

/* View-control icon buttons overlaid on the preview */
.view-controls {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 5;
  display: flex;
  gap: 6px;
}
.view-controls button {
  width: 34px;
  height: 34px;
  padding: 0;
  background: var(--white);
  border: 1.5px solid var(--indigo-dark);
  border-radius: 6px;
  color: var(--indigo-dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}
.view-controls button:hover { background: var(--indigo-bg); }
.view-controls button:active { transform: translateY(1px); }
.view-controls svg { width: 20px; height: 20px; display: block; }

/* ============ Height slider (right column) ============ */
.section-height {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 14px 12px 18px;
}
.height-sliders {
  display: flex;
  flex: 1;
  gap: 8px;
}
.height-slider-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.vslider-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--gray-text);
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}
.vertical-slider-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-height: 240px;
}
.vslider-end-label {
  font-size: 10px;
  color: var(--gray-text);
}
.vertical-slider {
  -webkit-appearance: none;
  appearance: none;
  writing-mode: vertical-lr;
  direction: rtl;
  width: 18px;
  flex: 1;
  background: transparent;
  cursor: pointer;
  --fill: 0%;
}
/* Fallback for browsers without writing-mode: vertical-lr support */
.vertical-slider:not([orient="vertical"]) {
  transform: rotate(-90deg);
  width: 240px;
  height: 18px;
}
.number-input-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
}
.number-input-wrap input {
  width: 56px;
  padding: 4px 6px;
  border: 1px solid var(--gray-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 12px;
}
.unit {
  font-size: 11px;
  color: var(--gray-text);
}

/* ============ Measurements (length + width sliders) ============ */
.slider-row {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.slider-field {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 320px;
}
.slider-field .field-label {
  min-width: 50px;
}
.slider-field input[type="range"] {
  flex: 1;
  accent-color: var(--indigo);
}
.slider-field input[type="number"] {
  width: 60px;
  padding: 4px 6px;
  border: 1px solid var(--gray-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 12px;
}

/* ============ Shape row ============ */
.shape-row {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: flex-end;
}

/* ============ Export buttons ============ */
.export-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 8px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background 0.12s, transform 0.05s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--indigo);
  color: var(--white);
  border-color: var(--indigo-dark);
}
.btn-primary:hover { background: var(--indigo-dark); }
.btn-secondary {
  background: var(--indigo-deep);
  color: var(--white);
  border-color: #1e1b4b;
}
.btn-secondary:hover { background: #1e1b4b; }

/* ============ Status bar ============ */
.status-bar {
  font-size: 12px;
  color: var(--gray-text);
  text-align: right;
  font-style: italic;
  min-height: 18px;
}
.status-bar.error { color: #b91c1c; font-style: normal; }
.status-bar.ok { color: #047857; }

/* ============ Responsive Design ============ */
@media (max-width: 768px) {
  .customizations-row {
    grid-template-columns: 1fr;
  }
  .hole-row {
    flex-direction: column;
    align-items: stretch;
  }
}
@media (min-width: 769px) and (max-width: 960px) {
  .customizations-row {
    grid-template-columns: 1fr 1fr;
  }
  .face-panel {
    grid-column: span 2;
  }
  .face-select-row {
    flex-direction: row;
    align-items: center;
  }
  .face-select-row select {
    width: auto;
    flex: 1;
  }
  .hole-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}
@media (min-width: 961px) {
  .customizations-row {
    grid-template-columns: 1.2fr 2.15fr 2.15fr;
  }
  .hole-row {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ============ Custom form controls (cross-browser) ============ */
/* Native range/checkbox/select controls render differently in every browser
   (and `accent-color` only tints them), so the controls are fully custom: a
   thin track with an indigo "fill" up to a soft white thumb ringed in indigo.
   WebKit/Blink has no native progress pseudo-element, so the filled portion is
   a gradient driven by the --fill variable that main.js keeps in sync with
   each slider's value; Firefox uses ::-moz-range-progress natively. */

/* ---- Horizontal sliders ---- */
.range-num-wrap input[type="range"],
.inline-slider input[type="range"],
.slider-field input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 18px;
  padding: 0;
  background: transparent;
  cursor: pointer;
  --fill: 0%;
}
.range-num-wrap input[type="range"]::-webkit-slider-runnable-track,
.inline-slider input[type="range"]::-webkit-slider-runnable-track,
.slider-field input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--indigo) 0 var(--fill), var(--gray-border) var(--fill) 100%);
}
.range-num-wrap input[type="range"]::-webkit-slider-thumb,
.inline-slider input[type="range"]::-webkit-slider-thumb,
.slider-field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -5px; /* centre the 16px thumb on the 6px track */
  border-radius: 50%;
  background: var(--white);
  border: 2.5px solid var(--indigo);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease, transform 0.05s ease;
}
.range-num-wrap input[type="range"]:hover::-webkit-slider-thumb,
.inline-slider input[type="range"]:hover::-webkit-slider-thumb,
.slider-field input[type="range"]:hover::-webkit-slider-thumb {
  box-shadow: 0 0 0 5px rgba(99, 102, 241, 0.18);
}
.range-num-wrap input[type="range"]:active::-webkit-slider-thumb,
.inline-slider input[type="range"]:active::-webkit-slider-thumb,
.slider-field input[type="range"]:active::-webkit-slider-thumb {
  transform: scale(1.1);
}
.range-num-wrap input[type="range"]::-moz-range-track,
.inline-slider input[type="range"]::-moz-range-track,
.slider-field input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: var(--gray-border);
}
.range-num-wrap input[type="range"]::-moz-range-progress,
.inline-slider input[type="range"]::-moz-range-progress,
.slider-field input[type="range"]::-moz-range-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--indigo);
}
.range-num-wrap input[type="range"]::-moz-range-thumb,
.inline-slider input[type="range"]::-moz-range-thumb,
.slider-field input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 2.5px solid var(--indigo);
  border-radius: 50%;
  background: var(--white);
  box-shadow: var(--shadow-sm);
}
.range-num-wrap input[type="range"]:focus-visible,
.inline-slider input[type="range"]:focus-visible,
.slider-field input[type="range"]:focus-visible {
  outline: 2px solid var(--indigo);
  outline-offset: 4px;
}

/* ---- Vertical Height sliders (writing-mode replaces deprecated slider-vertical) ---- */
.vertical-slider::-webkit-slider-runnable-track {
  width: 6px;
  border-radius: 999px;
  background: linear-gradient(to top, var(--indigo) 0 var(--fill), var(--gray-border) var(--fill) 100%);
}
.vertical-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin-left: -5px; /* centre the 16px thumb on the 6px track */
  border-radius: 50%;
  background: var(--white);
  border: 2.5px solid var(--indigo);
  box-shadow: var(--shadow-sm);
}
.vertical-slider:hover::-webkit-slider-thumb {
  box-shadow: 0 0 0 5px rgba(99, 102, 241, 0.18);
}
.vertical-slider::-moz-range-track {
  width: 6px;
  border-radius: 999px;
  background: var(--gray-border);
}
.vertical-slider::-moz-range-progress {
  width: 6px;
  border-radius: 999px;
  background: var(--indigo);
}
.vertical-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 2.5px solid var(--indigo);
  border-radius: 50%;
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

/* ---- Dropdowns: custom chevron (consistent across browsers) ---- */
.field select,
.shape-row select {
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath fill='none' stroke='%236b7280' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round' d='M2.5 4.5 L6 8 L9.5 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 11px;
  padding-right: 28px;
}