/* ── Circuit — electric hex-pipe placement puzzle ─────────────────────────── */

:root {
  --circuit-bg:          #0A0A0A;
  --circuit-blue:        #00BFFF;
  --circuit-blue-dim:    #005580;
  --circuit-blue-glow:   rgba(0,191,255,0.4);
  --circuit-cell-bg:     #0D1117;
  --circuit-cell-border: #1A2A3A;
  --circuit-pipe:        #00BFFF;
  --circuit-pipe-dim:    #003344;
  --circuit-white:       #FFFFFF;
}

body { background: var(--circuit-bg); }

#canvas-wrap {
  background: var(--circuit-bg);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  overflow-y: auto;
}

.ct-hide { display: none !important; }

/* ── Screen wrapper ───────────────────────────────────────────────────────── */

.ct-screen {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100%;
}

/* ── Start screen ─────────────────────────────────────────────────────────── */

#ct-start {
  justify-content: center;
  padding: 40px 24px 48px;
}

.ct-start-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 320px;
}

.ct-start-logo {
  display: block;
  width: 200px;
  max-width: 80%;
  margin: 0 auto 18px;
  filter: brightness(0) invert(1) drop-shadow(0 0 18px var(--circuit-blue-glow));
}

.ct-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  color: rgba(0, 191, 255, 0.5);
  line-height: 1.68;
  margin: 0 0 28px;
  text-align: left;
}

.ct-start-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

/* ── HUD ──────────────────────────────────────────────────────────────────── */

.ct-hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 10px 18px 4px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: rgba(0, 191, 255, 0.45);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  flex-shrink: 0;
}

/* ── Game screen / board ──────────────────────────────────────────────────── */

#ct-game { justify-content: flex-start; }

.ct-board-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 8px 12px 8px;
  box-sizing: border-box;
  min-height: 0;
  position: relative;
}

.ct-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
  display: block;
  overflow: visible;
}

/* ── Hex cells ────────────────────────────────────────────────────────────── */

.ct-hex {
  fill: var(--circuit-cell-bg);
  stroke: var(--circuit-white);
  stroke-opacity: 0.30;
  stroke-width: 1.4;
  transition: fill 0.12s, stroke-opacity 0.12s;
}

/* Blank cell — a piece belongs here */
.ct-tile.ct-blank .ct-hex {
  fill: #080C10;
  stroke: var(--circuit-blue);
  stroke-opacity: 0.65;
  stroke-width: 1.6;
  stroke-dasharray: 5 4;
}

/* ── Pipes ────────────────────────────────────────────────────────────────── */
/* The pipe group carries the rotation so it can animate about the tile centre. */

/* Only transform is transitioned. The win pulse drives `filter` per frame from
   requestAnimationFrame, and a CSS transition on it would smear the wavefront. */
.ct-pipes {
  transition: transform 150ms ease;
  transform-box: fill-box;
  transform-origin: center;
}

.ct-no-anim .ct-pipes { transition: none !important; }

.ct-pipe-glow {
  stroke: var(--circuit-blue);
  stroke-opacity: 0.25;
  stroke-linecap: round;
}

.ct-pipe-core {
  stroke: var(--circuit-pipe);
  stroke-linecap: round;
}

.ct-hub-glow { fill: var(--circuit-blue); fill-opacity: 0.25; }
.ct-hub      { fill: var(--circuit-pipe); }

/* ── Drag affordances ─────────────────────────────────────────────────────── */

.ct-svg { touch-action: none; }

/* Player-placed pieces can be picked up again; scaffold cannot. */
.ct-tile.ct-movable { cursor: grab; }
.ct-tile.ct-movable:active { cursor: grabbing; }
.ct-tile.ct-movable .ct-hex {
  stroke: var(--circuit-blue);
  stroke-opacity: 0.45;
}
.ct-tile.ct-locked { cursor: default; }

/* Cell under the dragged piece */
.ct-tile.ct-drop-target .ct-hex {
  fill: #10202E;
  stroke: var(--circuit-blue);
  stroke-opacity: 1;
  stroke-width: 2.4;
  stroke-dasharray: none;
}

/* Shelf lit up as a drop zone */
.ct-shelf.ct-drop-active {
  border-color: var(--circuit-blue);
  background: rgba(0, 191, 255, 0.09);
  box-shadow: inset 0 0 18px rgba(0, 191, 255, 0.18);
}

/* Ghost tile following the pointer */
#ct-drag-ghost {
  position: fixed;
  width: 58px;
  height: 58px;
  margin-left: -29px;
  margin-top: -29px;
  pointer-events: none;
  z-index: 5000;
  overflow: visible;
  filter: drop-shadow(0 0 14px rgba(0, 191, 255, 0.85));
}

#ct-drag-ghost .ct-hex {
  fill: #0B1420;
  stroke: var(--circuit-blue);
  stroke-opacity: 0.9;
  stroke-width: 1.8;
}

/* Snapped over a valid cell — read as locked-in */
#ct-drag-ghost.ct-snapped {
  filter: drop-shadow(0 0 20px rgba(0, 191, 255, 1));
}

/* ── Win sequence ─────────────────────────────────────────────────────────── */

/* Interaction is locked for the whole animation */
.ct-no-interact { pointer-events: none !important; }

/* Step 1 — brief white flash across every connection */
.ct-svg.ct-white-flash .ct-pipe-core,
.ct-svg.ct-white-flash .ct-hub {
  stroke: var(--circuit-white);
  fill: var(--circuit-white);
}
.ct-svg.ct-white-flash .ct-pipe-core { fill: none; }
.ct-svg.ct-white-flash {
  filter: drop-shadow(0 0 14px rgba(255, 255, 255, 0.9));
}

/* Junction spark — an SVG circle so it stays pinned to the junction centre
   at any board scale, unlike an absolutely-positioned element. */
.ct-spark {
  fill: var(--circuit-white);
  filter: drop-shadow(0 0 6px var(--circuit-blue)) drop-shadow(0 0 12px var(--circuit-blue));
  transform-box: fill-box;
  transform-origin: center;
  animation: ct-electric-spark 0.3s ease-out forwards;
  pointer-events: none;
}

@keyframes ct-electric-spark {
  0%   { opacity: 0; transform: scale(0); }
  30%  { opacity: 1; transform: scale(1.5); }
  100% { opacity: 0; transform: scale(0.5); }
}

/* Step 3 — settled, permanently powered */
.ct-svg.ct-powered .ct-pipe-core {
  filter: drop-shadow(0 0 6px rgba(0, 191, 255, 0.9));
}
.ct-svg.ct-powered .ct-hub {
  filter: drop-shadow(0 0 5px rgba(0, 191, 255, 0.9));
}
.ct-svg.ct-powered .ct-hex {
  stroke: var(--circuit-blue);
  stroke-opacity: 0.55;
}

/* ── Level complete overlay ───────────────────────────────────────────────── */

.ct-congrats-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  color: rgba(0, 191, 255, 0.55);
  margin: -16px 0 0;
  text-align: center;
  letter-spacing: 0.04em;
}

/* ── Shelf ────────────────────────────────────────────────────────────────── */

.ct-shelf-wrap {
  width: 100%;
  padding: 4px 12px 20px;
  box-sizing: border-box;
  flex-shrink: 0;
}

.ct-shelf-label {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(0, 191, 255, 0.38);
  text-align: center;
  margin: 0 0 8px;
}

.ct-shelf {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px;
  min-height: 64px;
  padding: 10px 8px;
  border: 1px solid var(--circuit-cell-border);
  border-radius: 12px;
  background: rgba(0, 191, 255, 0.03);
}

.ct-shelf-piece {
  width: 56px;
  height: 56px;
  display: block;
  cursor: pointer;
  border-radius: 8px;
  overflow: visible;
  filter: drop-shadow(0 0 6px rgba(0, 191, 255, 0.35));
  transition: filter 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

.ct-shelf-piece:hover {
  filter: drop-shadow(0 0 12px rgba(0, 191, 255, 0.7));
}

.ct-shelf-piece:active { transform: scale(0.94); }

/* Shelf tiles read as "loose parts" — brighter rim than board cells */
.ct-shelf-piece .ct-hex {
  fill: #0B1420;
  stroke: var(--circuit-blue);
  stroke-opacity: 0.5;
  stroke-width: 1.6;
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */

.ct-btn-primary {
  display: block;
  width: 100%;
  background: var(--circuit-blue);
  color: #04121A;
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  font-weight: 800;
  padding: 15px 0;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 4px 0 #0077A3, 0 6px 18px rgba(0, 191, 255, 0.25);
  transition: transform 0.07s, box-shadow 0.07s, background 0.12s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.ct-btn-primary:hover  { background: #33CDFF; }
.ct-btn-primary:active { transform: translateY(3px); box-shadow: 0 1px 0 #0077A3; }

.ct-btn-ghost {
  display: block;
  width: 100%;
  background: transparent;
  border: 1px solid rgba(0, 191, 255, 0.28);
  color: rgba(0, 191, 255, 0.55);
  padding: 14px 0;
  border-radius: 12px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s;
  -webkit-tap-highlight-color: transparent;
}

.ct-btn-ghost:hover { border-color: rgba(0, 191, 255, 0.6); color: rgba(0, 191, 255, 0.85); }

/* ── Win screen ───────────────────────────────────────────────────────────── */

#ct-win {
  justify-content: center;
  padding: 40px 24px 48px;
}

.ct-win-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.ct-win-logo {
  width: 200px;
  max-width: 70%;
  margin: 0 0 14px;
  filter: brightness(0) invert(1) drop-shadow(0 0 22px var(--circuit-blue-glow));
}

.ct-win-headline {
  font-family: 'DM Serif Display', serif;
  font-size: 2.2rem;
  color: var(--circuit-blue);
  margin: 0 0 12px;
  text-shadow: 0 0 24px var(--circuit-blue-glow);
}

.ct-win-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  color: rgba(0, 191, 255, 0.55);
  margin: 0 0 36px;
}

.ct-win-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 280px;
  width: 100%;
}

/* ── Congratulations overlay ─────────────────────────────────────────────── */

.ct-congrats {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  background: rgba(10, 10, 10, 0.92);
  z-index: 20;
  padding: 40px 32px;
  box-sizing: border-box;
}

.ct-congrats-head {
  font-family: 'DM Serif Display', serif;
  font-size: 2.6rem;
  color: var(--circuit-blue);
  margin: 0;
  text-align: center;
  text-shadow: 0 0 32px var(--circuit-blue-glow);
}

#ct-next-level { max-width: 240px; width: 100%; }

/* ── Directions popup logo (white on the dark modal) ──────────────────────── */

.ct-dir-logo {
  display: block;
  width: 150px;
  max-width: 55%;
  margin: 0 auto 14px;
  filter: brightness(0) invert(1);
}