/* ============================================
   GEOMETRY — Reusable primitives for the Parlour
   visual system (parlour_visual_overhaul_spec.md,
   sections 6, 29, 30).

   These are visual objects, not icons: composable
   building blocks that later phases assemble into
   page compositions, nav marks and abstract controls.
   Each primitive takes its size from --geo-size (set
   inline or via a .geo--sm/--md/--lg modifier) so one
   shape definition works at icon scale and hero scale.
============================================ */

.geo-circle,
.geo-triangle,
.geo-square,
.geo-semicircle,
.geo-arc,
.geo-dot {
  --geo-size: 24px;
  display: inline-block;
  width: var(--geo-size);
  height: var(--geo-size);
  flex: none;
}

/* Size modifiers — apply alongside any primitive class. */
.geo--sm { --geo-size: 12px; }
.geo--md { --geo-size: 24px; }
.geo--lg { --geo-size: 64px; }
.geo--xl { --geo-size: 128px; }

/* ---- Circle ---- */
/* Inactive states, focal points, progress anchors, selected objects. */

.geo-circle {
  border-radius: 50%;
  background: var(--primary);
}

.geo-circle--outline {
  background: none;
  border: 1.5px solid var(--primary);
}

.geo-circle--accent {
  background: var(--accent);
}

.geo-circle--accent.geo-circle--outline {
  background: none;
  border-color: var(--accent);
}

/* A line running through a circle — "intersected by a line" per 6.1 */
.geo-circle--pierced {
  position: relative;
}

.geo-circle--pierced::after {
  content: "";
  position: absolute;
  left: -25%;
  right: -25%;
  top: 50%;
  height: 1px;
  background: currentColor;
  transform: translateY(-50%);
}

/* ---- Triangle ---- */
/* Active states, forward movement, directional emphasis. Points right
   (the reading/forward direction) by default; rotate for other directions. */

.geo-triangle {
  background: var(--primary);
  clip-path: polygon(0% 0%, 100% 50%, 0% 100%);
}

.geo-triangle--accent {
  background: var(--accent);
}

.geo-triangle--up    { transform: rotate(-90deg); }
.geo-triangle--down   { transform: rotate(90deg); }
.geo-triangle--left  { transform: rotate(180deg); }

/* ---- Square ---- */

.geo-square {
  background: var(--primary);
}

.geo-square--outline {
  background: none;
  border: 1.5px solid var(--primary);
}

.geo-square--accent {
  background: var(--accent);
}

/* ---- Semicircle ---- */
/* Section transitions, large-page composition, movement between states.
   Flat edge down by default (a rising sun / doorway arch); rotate for
   other orientations. */

.geo-semicircle {
  height: calc(var(--geo-size) / 2);
  border-radius: var(--geo-size) var(--geo-size) 0 0;
  background: var(--primary);
}

.geo-semicircle--accent {
  background: var(--accent);
}

.geo-semicircle--down  { transform: rotate(180deg); transform-origin: center; }
.geo-semicircle--left  { transform: rotate(-90deg); }
.geo-semicircle--right { transform: rotate(90deg); }

/* ---- Arc ---- */
/* A quarter-circle stroke — partial framing rather than a full ring. */

.geo-arc {
  border-radius: 50%;
  border: 1.5px solid transparent;
  border-top-color: var(--primary);
  border-right-color: var(--primary);
}

.geo-arc--accent {
  border-top-color: var(--accent);
  border-right-color: var(--accent);
}

/* ---- Dot ---- */
/* A small fixed focal point — progress position, handle, destination. */

.geo-dot {
  --geo-size: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.geo-dot--navy {
  background: var(--primary);
}

/* ---- Line / Axis ---- */
/* Thin structural lines. .geo-line is a short connector between objects;
   .geo-axis spans its container as a full navigation/composition spine. */

.geo-line {
  display: block;
  height: 1px;
  width: 100%;
  background: var(--border);
}

.geo-line--solid {
  background: var(--primary);
}

.geo-line--accent {
  background: var(--accent);
}

.geo-line--vertical {
  width: 1px;
  height: 100%;
}

.geo-line--diagonal {
  transform: rotate(-24deg);
  transform-origin: left center;
}

.geo-axis {
  display: block;
  position: relative;
  height: 1px;
  width: 100%;
  background: var(--border);
}

.geo-axis--vertical {
  width: 1px;
  height: 100%;
}

/* ---- Stack (overlapping rectangles — the Decks motif, 11.5) ---- */

.geo-stack {
  position: relative;
  display: inline-block;
  width: var(--geo-size, 48px);
  height: calc(var(--geo-size, 48px) * .72);
}

.geo-stack-layer {
  position: absolute;
  inset: 0;
  border: 1.5px solid var(--primary);
  border-radius: 2px;
  background: var(--bg);
}

.geo-stack-layer:nth-child(1) {
  background: var(--primary);
  transform: translate(0, 10%);
}

.geo-stack-layer:nth-child(2) {
  transform: translate(6%, 4%);
}

.geo-stack-layer:nth-child(3) {
  border-color: var(--accent);
  transform: translate(12%, -2%);
}

/* ---- Path (curved progress line — Journey, SVG-based per 29) ---- */

.geo-path {
  display: block;
  width: 100%;
  height: auto;
}

.geo-path-line {
  fill: none;
  stroke: var(--border);
  stroke-width: 1.5;
}

.geo-path-line--progress {
  stroke: var(--primary);
}

.geo-path-node {
  fill: var(--primary);
}

.geo-path-node--current {
  fill: var(--accent);
}

/* ============================================
   Shape-state system (section 30) — the abstract
   toggle: an off/on control expressed as a shape
   change, not a sliding pill.

   Semantics live on the element itself
   (role="switch" aria-checked), so screen readers
   and keyboards see a normal switch; only the visual
   layer is geometric.
============================================ */

.geo-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 64px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
}

.geo-toggle-track {
  position: absolute;
  left: 10px;
  right: 10px;
  top: 50%;
  height: 1px;
  background: var(--border);
  transform: translateY(-50%);
}

.geo-toggle-shape {
  position: absolute;
  top: 50%;
  width: 18px;
  height: 18px;
  transition: opacity var(--dur-base) var(--ease-standard),
              transform var(--dur-base) var(--ease-standard);
}

.geo-toggle-shape--off {
  left: 10px;
  transform: translate(0, -50%) scale(1);
  border-radius: 50%;
  border: 1.5px solid var(--primary);
  background: var(--bg);
  opacity: 1;
}

.geo-toggle-shape--on {
  left: 36px;
  transform: translate(0, -50%) scale(.5);
  background: var(--accent);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  opacity: 0;
}

.geo-toggle[aria-checked="true"] .geo-toggle-shape--off {
  opacity: 0;
  transform: translate(0, -50%) scale(.5);
}

.geo-toggle[aria-checked="true"] .geo-toggle-shape--on {
  opacity: 1;
  transform: translate(0, -50%) scale(1);
}

.geo-toggle:disabled,
.geo-toggle[aria-disabled="true"] {
  cursor: default;
  opacity: .45;
}

@media (prefers-reduced-motion: reduce) {
  .geo-toggle-shape {
    transition: opacity var(--dur-fast) linear;
  }
}