:root {
  /* Maderas del tablero */
  --madera-clara: #e8c99a;
  --madera-oscura: #a2703f;
  --marco-1: #5c3a1e;
  --marco-2: #3f2814;
  --sel: rgba(255, 214, 92, 0.55);
}
* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #ece7df;
  background:
    radial-gradient(1200px 800px at 70% -10%, #3a352f 0%, #201d19 60%, #171410 100%);
  min-height: 100vh;
}

/* ---------- Layout escritorio: controles izquierda, tablero derecha ---------- */
main {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 40px;
  min-height: 100vh;
  padding: 20px;
}

.lado {
  flex: 0 0 340px;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

header {
  display: flex; flex-direction: column; gap: 10px;
}
.titulo-fila { display: flex; flex-direction: column; gap: 4px; }
.usuario-fila {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  font-size: 0.82rem; color: #c7bfb2;
  background: rgba(0,0,0,.22); padding: 6px 10px; border-radius: 8px;
}
.usuario-fila b { color: #ece7df; }
button.mini {
  padding: 5px 12px; font-size: 0.78rem; border-radius: 6px;
  background: rgba(255,255,255,.10); box-shadow: none;
}
button.mini:hover { background: rgba(255,255,255,.18); }
h1 { font-size: 1.5rem; margin: 0; font-weight: 700; letter-spacing: .2px; }
.vs { color: #d0a86a; font-weight: 400; }
#conexion { font-size: 0.85rem; }
#conexion.ok { color: #9ad86f; }
#conexion.bad { color: #e0a86a; }

.estado {
  font-size: 1.1rem; font-weight: 600; line-height: 1.35; min-height: 1.4em;
  background: rgba(0,0,0,.28);
  border-left: 3px solid #c69152;
  padding: 14px 16px; border-radius: 8px; margin: 0;
}
.meta {
  display: flex; flex-direction: column; gap: 6px;
  font-size: 0.9rem; color: #c7bfb2;
}
.meta code { background: rgba(0,0,0,.3); padding: 2px 7px; border-radius: 5px; }

button {
  background: linear-gradient(#b5793c, #96602e);
  color: #fff; border: 0; border-radius: 8px;
  padding: 11px 20px; font-size: 0.98rem; font-weight: 600; cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,.35);
  align-self: flex-start;
}
button:hover { filter: brightness(1.08); }
details { font-size: 0.85rem; color: #c7bfb2; }
summary { cursor: pointer; }
pre {
  white-space: pre-wrap; word-break: break-word;
  background: rgba(0,0,0,.3); padding: 10px; border-radius: 8px; font-size: 0.8rem;
  max-height: 40vh; overflow: auto;
}

/* ---------- Indicador "Claude está pensando" ---------- */
.pensando {
  display: flex; align-items: center; gap: 10px;
  background: linear-gradient(90deg, rgba(198,145,82,.22), rgba(198,145,82,.06));
  border: 1px solid rgba(198,145,82,.35);
  border-radius: 10px; padding: 10px 14px;
  font-size: .95rem; font-weight: 600; color: #f0d9b5;
}
.pensando .chip {
  font-size: 1.2rem; line-height: 1;
  display: inline-block;
  animation: girar 1.6s ease-in-out infinite;
}
.pensando .dots { display: inline-flex; gap: 4px; margin-left: auto; }
.pensando .dots i {
  width: 7px; height: 7px; border-radius: 50%;
  background: #e6b45a; display: inline-block;
  animation: rebote 1.1s ease-in-out infinite;
}
.pensando .dots i:nth-child(2) { animation-delay: .18s; }
.pensando .dots i:nth-child(3) { animation-delay: .36s; }

@keyframes rebote {
  0%, 80%, 100% { transform: translateY(0); opacity: .45; }
  40% { transform: translateY(-7px); opacity: 1; }
}
@keyframes girar {
  0%, 100% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(14deg) scale(1.18); }
}
/* Pulso del tablero mientras Claude piensa */
@keyframes pulsoTablero {
  0%, 100% { box-shadow: 0 18px 40px rgba(0,0,0,.55), inset 0 0 0 2px rgba(255,255,255,.06), inset 0 0 22px rgba(0,0,0,.5), 0 0 0 0 rgba(230,180,90,0); }
  50%      { box-shadow: 0 18px 40px rgba(0,0,0,.55), inset 0 0 0 2px rgba(255,255,255,.06), inset 0 0 22px rgba(0,0,0,.5), 0 0 26px 5px rgba(230,180,90,.5); }
}
body.esta-pensando .board-frame { animation: pulsoTablero 1.5s ease-in-out infinite; }
body.esta-pensando #tablero { cursor: progress; }
@media (prefers-reduced-motion: reduce) {
  .pensando .chip, .pensando .dots i, body.esta-pensando .board-frame { animation: none; }
}

/* ---------- Marco de madera ---------- */
.board-frame {
  --size: min(calc(100vh - 40px), calc(100vw - 440px));
  width: var(--size);
  height: var(--size);
  flex: 0 0 auto;
  padding: clamp(14px, 2.4%, 26px);
  border-radius: 10px;
  background:
    repeating-linear-gradient(91deg, rgba(0,0,0,.10) 0 3px, rgba(255,255,255,.03) 3px 7px),
    linear-gradient(150deg, var(--marco-1), var(--marco-2));
  box-shadow:
    0 18px 40px rgba(0,0,0,.55),
    inset 0 0 0 2px rgba(255,255,255,.06),
    inset 0 0 22px rgba(0,0,0,.5);
}

#tablero {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%; height: 100%;
  border: 1px solid rgba(0,0,0,.35);
  border-radius: 3px;
  overflow: hidden;
  user-select: none;
  box-shadow: inset 0 0 14px rgba(0,0,0,.45);
  container-type: size;           /* habilita unidades cqmin para escalar piezas/coords */
}

.casilla {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
/* Vetas de madera: capas de gradientes para dar textura realista */
.casilla.clara {
  background:
    repeating-linear-gradient(88deg, rgba(150,100,50,.10) 0 2px, rgba(255,240,210,.05) 2px 6px),
    repeating-linear-gradient(4deg, rgba(120,80,40,.06) 0 9px, transparent 9px 22px),
    linear-gradient(135deg, #efd3a6, var(--madera-clara) 55%, #d9b483);
}
.casilla.oscura {
  background:
    repeating-linear-gradient(88deg, rgba(60,35,15,.16) 0 2px, rgba(210,150,90,.06) 2px 6px),
    repeating-linear-gradient(4deg, rgba(40,22,8,.12) 0 9px, transparent 9px 22px),
    linear-gradient(135deg, #b17f49, var(--madera-oscura) 55%, #8c5e33);
}
.casilla.sel { box-shadow: inset 0 0 0 9999px var(--sel); }

/* Resaltado de la última jugada de Claude (origen y destino) */
.casilla.ultima::before {
  content: ""; position: absolute; inset: 0;
  background: rgba(245, 205, 70, 0.46);
  box-shadow: inset 0 0 0 2px rgba(180, 130, 20, 0.5);
  z-index: 0;
}

.pieza {
  font-size: 10.5cqmin;           /* escala al tamaño real del tablero (casilla ≈ 12.5cqmin) */
  line-height: 1;
  pointer-events: none;
  z-index: 2;
}
.pieza.blanca {
  color: #f6efe1;
  text-shadow:
    0.6px 0.6px 0 #2b1a0c, -0.6px -0.6px 0 #2b1a0c,
    0.6px -0.6px 0 #2b1a0c, -0.6px 0.6px 0 #2b1a0c,
    0 3px 4px rgba(0,0,0,.45);
}
.pieza.negra {
  color: #1c130a;
  text-shadow: 0 1px 0 rgba(255,255,255,.18), 0 3px 5px rgba(0,0,0,.5);
}

/* Coordenadas en las casillas del borde */
.coord {
  position: absolute; font-size: 2.5cqmin; font-weight: 800;
  pointer-events: none; z-index: 3; opacity: .85;
}
.coord.rank { top: 3px; left: 4px; }
.coord.file { bottom: 2px; right: 5px; }
.casilla.clara .coord { color: #8a5a2b; }
.casilla.oscura .coord { color: #f0d9b5; }

/* Marcadores de jugada legal */
.casilla.destino::after {
  content: ""; position: absolute;
  width: 30%; height: 30%; border-radius: 50%;
  background: rgba(30,20,10,.30);
  z-index: 1;
}
.casilla.captura::after {
  content: ""; position: absolute; inset: 6%;
  border-radius: 50%;
  box-shadow: inset 0 0 0 5px rgba(180,40,30,.55);
  z-index: 1;
}

/* ---------- Login ---------- */
.login-overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  background:
    radial-gradient(1000px 700px at 50% -10%, #3a352f 0%, #201d19 60%, #141210 100%);
}
[hidden] { display: none !important; }
.login-card {
  width: 100%; max-width: 360px;
  display: flex; flex-direction: column; gap: 12px;
  background: rgba(26,22,18,.92);
  border: 1px solid rgba(198,145,82,.28);
  border-radius: 14px;
  padding: 30px 26px;
  box-shadow: 0 20px 50px rgba(0,0,0,.55);
}
.login-card h1 { font-size: 1.35rem; text-align: center; }
.login-sub { text-align: center; color: #c7bfb2; margin: -4px 0 6px; font-size: .92rem; }
.login-card input {
  width: 100%; padding: 11px 13px; font-size: .95rem;
  background: rgba(0,0,0,.35); color: #ece7df;
  border: 1px solid rgba(255,255,255,.14); border-radius: 8px;
}
.login-card input:focus { outline: none; border-color: #c69152; }
.btn-google {
  background: #fff; color: #1a1a1a; font-weight: 600;
}
.btn-google:hover { filter: brightness(.94); }
.sep {
  display: flex; align-items: center; gap: 10px;
  color: #8f877b; font-size: .78rem; margin: 4px 0;
}
.sep::before, .sep::after {
  content: ""; flex: 1; height: 1px; background: rgba(255,255,255,.12);
}
.login-actions { display: flex; gap: 10px; }
.login-actions button { flex: 1; align-self: auto; text-align: center; }
button.secundario {
  background: rgba(255,255,255,.10); box-shadow: none;
}
button.secundario:hover { background: rgba(255,255,255,.18); }
.login-error { color: #e58a7a; font-size: .82rem; min-height: 1em; text-align: center; margin: 2px 0 0; }

/* ---------- Móvil: apilado, tablero arriba a lo ancho (vista actual) ---------- */
@media (max-width: 900px) {
  main {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 18px;
    padding: 16px 12px;
    max-width: 560px;
    margin: 0 auto;
  }
  .board-frame {
    order: -1;                    /* tablero arriba */
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    padding: clamp(10px, 3.5%, 18px);
  }
  .lado { flex: 1 1 auto; max-width: none; }
  h1 { font-size: 1.3rem; }
  button { align-self: stretch; text-align: center; }
}