/* ── Overlays: online, HUD, game-over, promo, setup mode ────────── */
   ONLINE OVERLAY
═══════════════════════════════════════════ */
#online-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(9,9,14,.92);
  display: none; align-items: center; justify-content: center;
  padding: var(--sp-4);
}
#online-overlay.on { display: flex; }

.op-box {
  padding: var(--sp-5) var(--sp-6);
  background: var(--surface);
  border: 1px solid var(--border-active);
  border-radius: var(--r-md);
  box-shadow: 0 8px 48px rgba(0,0,0,.5);
  animation: fadeUp 150ms ease both;
  text-align: center;
  min-width: 300px;
  width: min(90vw, 360px);
}

.op-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: var(--sp-4);
  letter-spacing: .04em;
}

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

.room-code {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 2.8rem);
  font-weight: 700;
  letter-spacing: .3em;
  color: var(--accent-bright);
  margin: var(--sp-3) 0;
  cursor: pointer;
  transition: opacity var(--ease);
}
.room-code:hover::after { content: "  ⎘"; font-size: .9rem; color: var(--text-dim); }

.op-hint {
  font-family: var(--font-mono);
  font-size: .52rem;
  letter-spacing: .15em; text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: var(--sp-3); line-height: 1.8;
}

.op-input {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4vw, 1.8rem);
  font-weight: 700;
  letter-spacing: .3em; text-transform: uppercase; text-align: center;
  width: min(160px, 50vw);
  padding: var(--sp-2) var(--sp-3);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text); outline: none;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.op-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74,127,165,.15);
}

.op-status {
  font-family: var(--font-mono);
  font-size: .52rem; color: var(--text-dim);
  letter-spacing: .1em; text-transform: uppercase;
  min-height: 1rem; margin: var(--sp-2) 0; line-height: 1.8;
}
.op-status.ok  { color: var(--ok); }
.op-status.err { color: var(--danger); }

.spinner { display: inline-block; animation: spin 600ms linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }


/* ═══════════════════════════════════════════
   HUD — in-game overlay
═══════════════════════════════════════════ */
#hud { position: fixed; inset: 0; pointer-events: none; z-index: 50; display: none; touch-action: none; }
#hud.on { display: block; }

/* Chess clocks */
.clock-box {
  position: absolute; top: var(--sp-3);
  pointer-events: all;
  display: none; flex-direction: column; align-items: center; gap: 2px;
}
.clock-box.visible { display: flex; }
.clock-box.left  { left: var(--sp-3); align-items: flex-start; }
.clock-box.right { right: var(--sp-3); align-items: flex-end; }

.clock-lbl {
  font-family: var(--font-mono);
  font-size: .45rem; letter-spacing: .2em;
  color: var(--text-dim); text-transform: uppercase;
}

.ctime {
  font-family: var(--font-mono);
  font-size: 1.7rem; font-weight: 700;
  letter-spacing: .06em; color: var(--text);
  background: var(--surface);
  padding: var(--sp-1) var(--sp-3);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  min-width: 88px; text-align: center; line-height: 1;
  transition: color 200ms, border-color 200ms, box-shadow 200ms;
}
.clock-box.active .ctime { border-color: var(--accent); box-shadow: 0 0 8px rgba(74,127,165,.2); }
.clock-box.low    .ctime { color: var(--warm); border-color: var(--warm); }
.clock-box.crit   .ctime { color: var(--danger); border-color: var(--danger); animation: critBlink 500ms ease infinite; }
@keyframes critBlink { 0%,100%{ opacity: 1; } 50%{ opacity: .45; } }

/* Center HUD top strip */
.hud-top {
  position: absolute; top: var(--sp-3);
  left: 50%; transform: translateX(-50%);
  text-align: center; display: flex; flex-direction: column;
  align-items: center; gap: var(--sp-1);
}

.turn-pill {
  font-family: var(--font-mono);
  font-size: .58rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: var(--text);
  padding: var(--sp-2) var(--sp-4);
  background: rgba(9,9,14,.85);
  border: 1px solid var(--border-active);
  border-radius: var(--r-sm);
  white-space: nowrap;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.status-txt {
  font-family: var(--font-display);
  font-size: 1.1rem; font-weight: 800;
  letter-spacing: .2em; color: var(--danger);
  display: none;
}
.status-txt.on { display: block; animation: statusSlam 140ms ease; }

.sel-label {
  font-family: var(--font-mono);
  font-size: .5rem; letter-spacing: .12em;
  color: var(--warm); text-transform: uppercase; min-height: 1rem;
}

/* Bottom corners */
.hud-bl {
  position: absolute; bottom: var(--sp-4); left: var(--sp-4);
  pointer-events: all; display: flex; flex-direction: column; gap: var(--sp-2);
}
.hud-br {
  position: absolute; bottom: var(--sp-4); right: var(--sp-4);
  pointer-events: all; text-align: right;
  display: flex; flex-direction: column; align-items: flex-end; gap: var(--sp-2);
}

/* Small HUD action buttons */
.btn-sm {
  font-family: var(--font-mono);
  font-size: .52rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: rgba(9,9,14,.8);
  color: var(--text-dim);
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
  touch-action: manipulation;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.btn-sm:hover  { background: rgba(232,228,220,.06); border-color: var(--border-active); color: var(--text); }
.btn-sm:active { transform: translateY(1px); }

.info-tag {
  font-family: var(--font-mono);
  font-size: .5rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-dim);
  padding: var(--sp-1) var(--sp-2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: rgba(9,9,14,.8);
  line-height: 1.8;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
/* Stockfish active */
#sf-tag.sf-on  { color: var(--ok);   border-color: rgba(74,154,122,.4); }
/* Fallback minimax */
#sf-tag.sf-off { color: var(--warm); border-color: rgba(200,184,162,.3); }

.cap-tray { font-size: .9rem; color: var(--text-dim); min-height: 1.1rem; }


/* ═══════════════════════════════════════════
   GAME OVER SCREEN
═══════════════════════════════════════════ */
#gameover {
  position: fixed; inset: 0;
  display: none;
  align-items: center; justify-content: center;
  z-index: 300;
  background: rgba(9,9,14,.90);
}
#gameover.on { display: flex; }

.go-box {
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
  padding: var(--sp-6);
  background: var(--surface);
  border: 1px solid var(--border-active);
  border-radius: var(--r-md);
  box-shadow: 0 8px 48px rgba(0,0,0,.6);
  animation: fadeUp 180ms ease both;
  width: min(88vw, 360px);
  isolation: isolate;
}

.go-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 6vw, 2.4rem);
  font-weight: 800;
  color: var(--text); letter-spacing: .06em;
  margin-bottom: var(--sp-2);
  text-align: center; width: 100%;
}

.go-sub {
  font-family: var(--font-mono);
  font-size: .56rem; letter-spacing: .22em;
  color: var(--text-dim);
  margin-bottom: var(--sp-5);
  text-transform: uppercase; line-height: 2;
  text-align: center; width: 100%;
}

.go-btns {
  display: flex; flex-direction: column; gap: var(--sp-2);
  width: 100%;
}
.go-btns .btn { width: 100%; min-width: unset; text-align: center; }



/* ═══════════════════════════════════════════
   PAWN PROMOTION PICKER
═══════════════════════════════════════════ */
#promo {
  position: fixed; inset: 0; display: none;
  align-items: center; justify-content: center;
  z-index: 400; background: rgba(9,9,14,.94);
  padding: var(--sp-4);
}
#promo.on { display: flex; }

.promo-box {
  padding: var(--sp-4) var(--sp-5);
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border-active);
  border-radius: var(--r-md);
  animation: fadeUp 140ms ease both;
}

.promo-lbl {
  font-family: var(--font-mono);
  font-size: .52rem; letter-spacing: .25em;
  text-transform: uppercase; color: var(--text-dim);
  margin-bottom: var(--sp-3); line-height: 2;
}

.promo-btns { display: flex; gap: var(--sp-3); }

.pbtn {
  font-size: 2.2rem; width: 64px; height: 64px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: transparent; color: var(--text);
  cursor: pointer; font-family: serif;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
  touch-action: manipulation;
}
.pbtn:hover  { background: rgba(232,228,220,.06); border-color: var(--border-active); transform: translateY(-2px); }
.pbtn:active { transform: translateY(1px); }


/* ═══════════════════════════════════════════
   SETUP MODE — pre-game board editor
═══════════════════════════════════════════ */
#setup-overlay {
  position: fixed; inset: 0; display: none;
  flex-direction: column;
  z-index: 80;
  pointer-events: none; /* children re-enable selectively */
}
#setup-overlay.on { display: flex; }

/* Top bar — title + actions */
#setup-bar {
  position: absolute; top: var(--sp-3);
  left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: var(--sp-2);
  pointer-events: all;
  background: rgba(9,9,14,.88);
  border: 1px solid var(--border-active);
  border-radius: var(--r-sm);
  padding: var(--sp-2) var(--sp-3);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  white-space: nowrap;
}

#setup-bar-label {
  font-family: var(--font-mono);
  font-size: .58rem; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--warm);
}

#setup-status {
  font-family: var(--font-mono);
  font-size: .52rem; letter-spacing: .08em;
  color: var(--text-dim);
  min-width: 120px;
}
#setup-status.err { color: var(--danger); }
#setup-status.ok  { color: var(--ok); }

/* Piece palette — horizontal scrollable tray pinned to bottom */
#setup-palette {
  position: absolute; bottom: 0; left: 0; right: 0;
  pointer-events: all;
  background: rgba(9,9,14,.92);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: var(--sp-2) var(--sp-3) calc(var(--sp-2) + env(safe-area-inset-bottom));
  display: flex; flex-direction: column; gap: var(--sp-1);
}

.palette-row {
  display: flex; gap: var(--sp-1); align-items: center;
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 2px; /* prevent clip on active border */
}
.palette-row::-webkit-scrollbar { display: none; }

.palette-label {
  font-family: var(--font-mono);
  font-size: .44rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--text-dim);
  flex-shrink: 0; width: 36px;
}

/* Individual piece chip in the palette */
.pchip {
  flex-shrink: 0;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; font-family: serif;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
  touch-action: manipulation;
  user-select: none;
}
.pchip:hover  { background: rgba(232,228,220,.06); border-color: var(--border-active); }
.pchip.active {
  border-color: var(--accent-bright);
  background: rgba(74,127,165,.18);
  transform: translateY(-2px);
  box-shadow: 0 0 10px rgba(74,127,165,.3);
}

/* Erase chip */
.pchip.erase  { font-size: 1rem; color: var(--text-dim); }
.pchip.erase.active { border-color: var(--danger); background: rgba(192,68,76,.15); }

/* Bottom action buttons row */
#setup-actions {
  display: flex; gap: var(--sp-2); justify-content: center;
  padding-top: var(--sp-1);
  flex-wrap: wrap;
}
#setup-actions .btn {
  flex: 1; min-width: 100px; max-width: 180px;
  padding: 10px var(--sp-3);
}

/* Held-piece ghost cursor shown while a piece is selected */
#setup-cursor {
  position: fixed;
  pointer-events: none;
  z-index: 90;
  font-size: 2rem; font-family: serif;
  transform: translate(-50%, -50%);
  display: none;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,.6));
}

.dmg {
  position: fixed;
  font-family: var(--font-mono); font-size: .82rem; font-weight: 700;
  pointer-events: none; z-index: 600;
  transform: translateX(-50%);
  animation: floatUp 900ms ease forwards;
}
.dmg.cap { color: var(--warm); }
.dmg.prm { color: var(--accent-bright); }
.dmg.tim { color: var(--danger); }

/* Check flash overlay */
#chkflash {
  position: fixed; inset: 0; pointer-events: none;
  z-index: 150; background: rgba(192,68,76,.10); display: none;
}
#chkflash.on { display: block; animation: chkAnim 400ms ease forwards; }