/* ============================================================
   play.css — /play Game Hub layout
   ============================================================ */

.play-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: var(--nav-h) 1fr;
  height: 100dvh;
  overflow: hidden;
}

/* ── Sidebar ─────────────────────────────────────────────────────────────── */
.play-sidebar {
  grid-row: 1 / -1;
  display: flex;
  flex-direction: column;
  background: var(--clr-surface);
  border-right: 1px solid var(--clr-border);
  padding: var(--sp-4);
  padding-top: calc(var(--nav-h) + var(--sp-4));
  gap: var(--sp-4);
  overflow-y: auto;
}

.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.sidebar-label {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-muted);
  padding: var(--sp-2) var(--sp-3);
}

/* Variant tabs */
.variant-tab {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid transparent;
  background: transparent;
  color: var(--clr-text);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-align: left;
  width: 100%;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast);
}

.variant-tab:hover {
  background: var(--clr-surface-alt);
}

.variant-tab[aria-selected="true"] {
  background: var(--clr-accent-glow);
  border-color: var(--clr-accent);
  color: #fff;
}

.variant-tab-icon {
  font-size: 1.25rem;
  line-height: 1;
  flex-shrink: 0;
}

.variant-tab-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.variant-tab-name {
  font-weight: 600;
  font-size: var(--fs-sm);
}

.variant-tab-desc {
  font-size: var(--fs-xs);
  color: var(--clr-muted);
}

/* ── Sidebar controls ────────────────────────────────────────────────────── */
.play-controls {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-top: auto;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
  color: var(--clr-muted);
}

.toggle-switch {
  appearance: none;
  width: 36px;
  height: 20px;
  background: var(--clr-border);
  border-radius: 999px;
  cursor: pointer;
  position: relative;
  transition: background var(--t-fast);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--t-fast);
}

.toggle-switch:checked {
  background: var(--clr-accent);
}

.toggle-switch:checked::after {
  transform: translateX(16px);
}

/* ── Main game area ──────────────────────────────────────────────────────── */
.play-main {
  grid-row: 2;          /* sit in the 1fr row, below the nav-height reservation */
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* Coordinate HUD */
.coord-hud {
  position: absolute;
  bottom: var(--sp-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  background: rgba(11, 13, 20, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  padding: var(--sp-2) var(--sp-6);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  pointer-events: none;
  transition: opacity var(--t-fast);
}

.coord-hud[data-hidden="true"] {
  opacity: 0;
}

.coord-label {
  color: var(--clr-muted);
  font-size: var(--fs-xs);
}

.coord-value {
  color: var(--clr-accent);
  font-weight: 600;
}

/* Canvas area: square-constrained, centered within .play-main */
.canvas-area {
  flex: 1;
  min-height: 0;
  min-width: 0;
  position: relative;
  display: grid;
  grid-template: 1fr / 1fr;
  place-items: center;
  container-type: size;
}

/* Both canvases share the same grid cell — stacked, always square.
   min(100cqw, 100cqh) picks the smaller container dimension so the
   square always fits fully, whether the viewport is landscape or portrait. */
#game-canvas,
#tutorial-highlight {
  grid-area: 1 / 1;
  width:  min(100cqw, 100cqh);
  height: min(100cqw, 100cqh);
}

/* WebGL canvas */
#game-canvas {
  touch-action: none;
  cursor: crosshair;
}

#game-canvas:active {
  cursor: grabbing;
}

/* Status bar (whose turn, score) */
.play-statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) var(--sp-6);
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  font-size: var(--fs-sm);
  gap: var(--sp-4);
}

.player-indicator {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 600;
}

.player-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.player-dot--p1 { background: var(--clr-p1); box-shadow: 0 0 6px var(--clr-p1); }
.player-dot--p2 { background: var(--clr-p2); box-shadow: 0 0 6px var(--clr-p2); }

.nexus-scores {
  display: flex;
  gap: var(--sp-6);
  font-family: var(--font-mono);
}

.nexus-score {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
}

/* Win overlay */
.win-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(11, 13, 20, 0.8);
  backdrop-filter: blur(4px);
  z-index: 20;
  gap: var(--sp-6);
  animation: fadeIn var(--t-slow) var(--ease-out);
}

.win-overlay[hidden]    { display: none; }
#section-ai[hidden]     { display: none; }   /* Chromium: flex beats UA [hidden] */
#difficulty-row[hidden] { display: none; }
#nexus-scores[hidden]   { display: none; }
#nexus-status[hidden]   { display: none; }

/* ── Hyper-Nexus live status panel ──────────────────────────────────────── */
.nexus-live-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--clr-text);
}

.nexus-live-table th,
.nexus-live-table td {
  padding: var(--sp-1) var(--sp-3);
  text-align: center;
}

.nexus-live-table th {
  padding-bottom: var(--sp-2);
}

.nexus-live-table th .player-dot {
  display: inline-block;
}

.nexus-live-table td:first-child {
  text-align: left;
  font-family: var(--font-sans, sans-serif);
  color: var(--clr-muted);
  padding-left: 0;
}

.nexus-board-total {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) var(--sp-3) 0;
  border-top: 1px solid var(--clr-border);
  margin-top: var(--sp-2);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
}

.nexus-board-total-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--clr-muted);
  font-family: var(--font-sans, sans-serif);
}

.win-title {
  font-size: var(--fs-3xl);
  font-weight: 800;
  text-align: center;
}

.win-actions {
  display: flex;
  gap: var(--sp-4);
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to   { opacity: 1; transform: scale(1); }
}

/* ── Tutorial highlight overlay ─────────────────────────────────────────── */
#tutorial-highlight {
  pointer-events: none;
  z-index: 5;
}

/* ── Tutorial instruction panel ─────────────────────────────────────────── */
.tutorial-panel {
  position: absolute;
  bottom: 3.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 15;
  background: rgba(19, 23, 42, 0.96);
  border: 1px solid var(--clr-accent);
  border-radius: var(--r-lg);
  padding: var(--sp-6) var(--sp-8);
  max-width: 480px;
  width: calc(100% - 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  backdrop-filter: blur(8px);
  box-shadow: 0 0 40px var(--clr-accent-glow);
  animation: fadeIn var(--t-base) var(--ease-out);
}

.tutorial-panel[hidden] { display: none; }

.tutorial-step-badge {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-accent);
}

.tutorial-instruction {
  color: var(--clr-text);
  font-size: var(--fs-sm);
  line-height: 1.6;
  margin: 0;
}

.tutorial-actions {
  display: flex;
  gap: var(--sp-3);
  justify-content: flex-end;
}

/* ── AI difficulty pills ─────────────────────────────────────────────────── */
.difficulty-pills {
  display: flex;
  gap: var(--sp-2);
  padding: var(--sp-1) 0 var(--sp-2);
}

/* Difficulty pills stretch to fill the container */
.difficulty-pills .pill {
  flex: 1;
}

/* ── Matchmaking overlay ─────────────────────────────────────────────────── */
.matchmaking-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  background: rgba(11, 13, 20, 0.82);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: inherit;
}

.matchmaking-overlay[hidden] { display: none; }

.matchmaking-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-4);
  text-align: center;
}

.matchmaking-spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--clr-border);
  border-top-color: var(--clr-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.matchmaking-text {
  font-size: var(--fs-sm);
  color: var(--clr-muted);
}

/* ── Elo delta badge (shown after online game ends) ─────────────────────── */
.elo-delta-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 700;
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--r-sm);
  margin-top: var(--sp-2);
}

.elo-delta-badge--up   { background: rgba(76, 175, 130, 0.15); color: #4caf82; }
.elo-delta-badge--down { background: rgba(255, 95, 126, 0.15); color: var(--clr-p2); }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .play-layout {
    grid-template-columns: 1fr;
    grid-template-rows: var(--nav-h) auto 1fr auto;
  }

  .play-sidebar {
    grid-row: 2;
    flex-direction: row;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--clr-border);
    padding: var(--sp-2) var(--sp-4);
  }

  .play-main {
    grid-row: 3;        /* below the horizontal sidebar strip on mobile */
  }

  .sidebar-label { display: none; }
  .sidebar-section { flex-direction: row; gap: var(--sp-2); }

  .variant-tab-desc { display: none; }
  .play-controls { margin-top: 0; flex-direction: row; align-items: center; }
}