/* snake — negro, rejilla, un solo rojo */

:root {
  --bg: #000;
  --fg: #fff;
  --muted: #737373;
  --dim: #4a4a4a;
  --line: #1e1e1e;
  --line2: #383838;
  --accent: #ff2b2b;
  --mono: ui-monospace, "SFMono-Regular", "SF Mono", "Roboto Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

/* trama de fósforo, se puede quitar desde el menú */
html.trama body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 99;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.028) 0 1px,
    transparent 1px 3px
  );
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

button:disabled {
  cursor: default;
}

:focus-visible {
  outline: 1px solid var(--fg);
  outline-offset: 2px;
}

#app {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: clamp(3px, 0.7vh, 7px);
  width: 100%;
  max-width: 1500px;
  margin: 0 auto;
  padding:
    max(6px, env(safe-area-inset-top))
    clamp(6px, 1.4vw, 14px)
    max(5px, env(safe-area-inset-bottom));
}

/* barra superior: marca, marcador y botones en una sola línea */

#topbar {
  position: relative;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.6vw, 18px);
  min-height: 26px;
}

.brand {
  flex: none;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
}

.brand .dot {
  color: var(--accent);
}

.version {
  margin-left: 8px;
  padding-left: 7px;
  border-left: 1px solid var(--line2);
  color: var(--muted);
  font-size: 8px;
  font-weight: 400;
  letter-spacing: 0.12em;
  vertical-align: middle;
}

.language-control {
  display: inline-flex;
  flex: none;
}

#lang-switch {
  min-width: 39px;
  min-height: 26px;
  padding: 3px 5px;
  border: 1px solid var(--line2);
  border-radius: 0;
  background: #000;
  color: var(--fg);
  font: inherit;
  font-size: 9px;
  letter-spacing: 0.12em;
  cursor: pointer;
}

#lang-switch:hover {
  border-color: var(--fg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.stats {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
  flex: 1;
}

.meta {
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.score {
  font-size: clamp(15px, 2.2vw, 19px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.mult {
  font-size: 11px;
  font-weight: 600;
  color: var(--dim);
}

.mult.activo {
  color: var(--fg);
}

/* Destello breve para cambios importantes del HUD. */
.mult.golpe,
.score.golpe,
.meta.golpe,
.best.golpe {
  background: var(--fg);
  color: #000;
  outline: 2px solid #ffffff;
  outline-offset: 1px;
}

.best.vivo {
  color: var(--fg);
  font-weight: 600;
}

.best {
  margin-left: auto;
  padding-left: 10px;
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--dim);
  white-space: nowrap;
}

.tools {
  display: flex;
  gap: 5px;
  flex: none;
}

.tool {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 7px;
  border: 1px solid var(--line2);
  font-size: 9px;
  letter-spacing: 0.12em;
  color: #cfcfcf;
  transition: color 0.12s, border-color 0.12s;
}

.tool:hover:not(:disabled) {
  border-color: var(--fg);
  color: var(--fg);
}

.tool:disabled {
  opacity: 0.3;
}

.tool.apagado {
  color: var(--muted);
}

.led {
  width: 5px;
  height: 5px;
  background: var(--fg);
}

.tool.apagado .led {
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--dim);
}

#stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

/* el marco lo dibuja el motor a bloques: aquí no hay borde fijo */
#board {
  display: block;
  background: #000;
  touch-action: none;
}

#prompt {
  position: absolute;
  left: 50%;
  bottom: 6%;
  transform: translateX(-50%);
  padding: 4px 7px;
  border: 1px solid var(--line);
  background: #000;
  font-size: 9px;
  letter-spacing: 0.16em;
  color: #9a9a9a;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.16s ease;
}

#prompt.visible {
  opacity: 1;
}

/* capa de menús */

#overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  padding:
    max(58px, calc(env(safe-area-inset-top) + 52px))
    max(14px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom))
    max(14px, env(safe-area-inset-left));
  background: rgba(0, 0, 0, 0.955);
  opacity: 0;
  visibility: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  transition: opacity 0.12s ease, visibility 0.12s;
}

#overlay.abierto {
  opacity: 1;
  visibility: visible;
}

.panel {
  width: 100%;
  max-width: 760px;
  margin: auto;
  animation: aparecer 130ms ease-out;
}

@keyframes aparecer {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.kicker {
  margin: 0;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.nota {
  margin: 0;
  font-size: 10px;
  letter-spacing: 0.06em;
  line-height: 1.65;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(46px, 12vw, 86px);
  font-weight: 700;
  line-height: 0.78;
  letter-spacing: -0.06em;
}

h1 .dot {
  color: var(--accent);
}

/* el rótulo es un lienzo: la serpiente escribe su nombre */
h1.marca {
  line-height: 0;
  font-size: 0;
  letter-spacing: 0;
}

h1.marca canvas {
  display: block;
  width: min(300px, 100%);
  height: auto;
  /* bloques nítidos, sin suavizado */
  image-rendering: pixelated;
}

h2 {
  margin: 0;
  font-size: clamp(15px, 3vw, 19px);
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* inicio */

.inicio {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 232px;
  gap: clamp(18px, 3vw, 34px);
  align-items: start;
}

.inicio-texto {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2vh, 18px);
  min-width: 0;
}

.inicio-cabeza {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tagline {
  margin: -2px 0 0;
  color: var(--fg);
  font-size: clamp(13px, 2.5vw, 17px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.filas {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.grupo {
  margin: 10px 0 4px;
  font-size: 8px;
  letter-spacing: 0.22em;
  color: var(--dim);
  text-transform: uppercase;
}

.grupo:first-child {
  margin-top: 0;
}

.row {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: clamp(7px, 1.4vh, 11px) 9px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  transition: background 0.1s, color 0.1s;
}

.row-idx {
  font-size: 9px;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}

.row-name {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: clamp(13px, 2.4vw, 15px);
  font-weight: 600;
  letter-spacing: 0.1em;
  min-width: 0;
}

.row-name small {
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.row-right {
  font-size: 10px;
  color: #b8b8b8;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.row.sel,
.row:hover {
  background: var(--fg);
  color: #000;
}

.row.sel .row-idx,
.row:hover .row-idx,
.row.sel .row-name small,
.row:hover .row-name small,
.row.sel .row-right,
.row:hover .row-right {
  color: #555;
}

.pie {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin: 0;
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.link {
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

.link:hover {
  color: var(--fg);
  border-color: var(--line2);
}

.inicio-demo {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 4px;
}

.inicio-demo canvas {
  display: block;
  width: 100%;
  max-width: 232px;
  box-shadow: 0 0 0 1px var(--line2);
}

/* foco de teclado: un marco de 2 px, sin sombras ni adornos */

button.foco {
  outline: 2px solid #ffffff;
  outline-offset: -2px;
}

.row.sel.foco,
.celda.sel.foco,
.tab.sel.foco,
.acciones button.principal.foco {
  outline-color: #000000;
}

.link.foco {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
  color: #ffffff;
}

/* portada: tres grupos, cada uno abre su subpágina */

.portada .filas .row {
  padding: clamp(10px, 2.2vh, 16px) 10px;
}

.portada .row-name {
  font-size: clamp(15px, 3vw, 18px);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.modos {
  display: flex;
  flex-direction: column;
  gap: clamp(10px, 2vh, 16px);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.tab {
  flex: 1 1 0;
  min-width: 88px;
  padding: 8px 10px;
  background: #000;
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  transition: background 0.1s, color 0.1s;
}

.tab:hover {
  color: var(--fg);
  background: #111;
}

.tab.sel {
  background: var(--fg);
  color: #000;
}

.modos-cuerpo {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 232px;
  gap: clamp(16px, 3vw, 30px);
  align-items: start;
}

/* niveles */

.niveles {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2vh, 18px);
}

.niveles-cabeza {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.ghost {
  flex: none;
  padding: 5px 8px;
  border: 1px solid var(--line2);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: #cfcfcf;
  transition: border-color 0.12s, color 0.12s;
}

.ghost:hover {
  border-color: var(--fg);
  color: var(--fg);
}

.ghost kbd {
  margin-left: 4px;
  padding: 1px 3px;
  border: 1px solid var(--line2);
  font-family: inherit;
  font-size: 8px;
  letter-spacing: 0.06em;
  color: #7a7a7a;
}

.ghost:hover kbd {
  border-color: #b9b9b9;
  color: #4a4a4a;
}

.niveles-cuerpo {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 184px;
  gap: clamp(14px, 2.4vw, 24px);
  align-items: start;
}

.rejilla {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.celda {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 62px;
  padding: 7px;
  background: #000;
  text-align: left;
  transition: background 0.1s, color 0.1s;
}

.celda-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.celda-num {
  font-size: clamp(14px, 3vw, 17px);
  font-weight: 600;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.celda-tick {
  font-size: 9px;
  color: var(--muted);
}

.celda-nombre {
  font-size: 8px;
  letter-spacing: 0.12em;
  color: #cfcfcf;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.celda-meta {
  font-size: 7px;
  letter-spacing: 0.08em;
  color: #5f5f5f;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.celda.bloqueada {
  cursor: not-allowed;
}

.celda.bloqueada .celda-num {
  color: #2b2b2b;
}

.celda.bloqueada .celda-nombre,
.celda.bloqueada .celda-meta {
  color: #2b2b2b;
}

.celda:hover:not(.bloqueada):not(.sel) {
  background: #101010;
}

.celda.sel:not(.bloqueada) {
  background: var(--fg);
  color: #000;
}

.celda.sel:not(.bloqueada) .celda-nombre,
.celda.sel:not(.bloqueada) .celda-meta,
.celda.sel:not(.bloqueada) .celda-tick {
  color: #555;
}

.vistazo {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.vistazo canvas {
  display: block;
  width: 100%;
  max-width: 184px;
  box-shadow: 0 0 0 1px var(--line2);
}

/* ayuda */

.ayuda {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2vh, 18px);
  max-width: 560px;
}

.tabla {
  width: 100%;
  border-collapse: collapse;
  font-size: 10px;
}

.tabla th {
  width: 34%;
  padding: 6px 8px 6px 0;
  text-align: left;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-top: 1px solid var(--line);
  vertical-align: top;
}

.tabla td {
  padding: 6px 0;
  letter-spacing: 0.03em;
  color: #dcdcdc;
  border-top: 1px solid var(--line);
}

.reglas {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 10px;
  letter-spacing: 0.03em;
  line-height: 1.6;
  color: #cfcfcf;
}

.reglas li::before {
  content: "—";
  color: var(--dim);
  margin-right: 8px;
}

/* fin de partida */

.fin {
  max-width: 400px;
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.4vh, 20px);
  padding: clamp(16px, 4vw, 24px);
  border: 1px solid var(--line2);
}

.fin-cabeza {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cifra {
  margin: 0;
  font-size: clamp(38px, 10vw, 58px);
  font-weight: 600;
  line-height: 0.86;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
}

.acciones {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.acciones button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 12px;
  background: #000;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-align: left;
  transition: background 0.1s, color 0.1s;
}

.acciones button:hover {
  background: var(--fg);
  color: #000;
}

.acciones button.principal {
  background: var(--fg);
  color: #000;
}

.acciones button.principal:hover {
  background: #d8d8d8;
}

.acciones kbd {
  font-family: inherit;
  font-size: 8px;
  letter-spacing: 0.06em;
  color: #7a7a7a;
  border: 1px solid var(--line2);
  padding: 2px 4px;
}

.acciones button:hover kbd,
.acciones button.principal kbd {
  color: #4a4a4a;
  border-color: #b9b9b9;
}

/* aviso de foco, para cuando el juego va dentro de un iframe */

#aviso-foco {
  position: fixed;
  left: 50%;
  bottom: max(8px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 30;
  margin: 0;
  padding: 5px 9px;
  border: 1px solid var(--line2);
  background: #000;
  font-size: 9px;
  letter-spacing: 0.12em;
  color: #cfcfcf;
  text-align: center;
}

#aviso-foco[hidden] {
  display: none !important;
}

/* pie */

#footer {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#combo {
  height: 2px;
  background: #171717;
}

#chain-bar {
  height: 100%;
  width: 0;
  background: var(--fg);
  transition: width 0.07s linear;
}

.foot-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 15px;
}

#hint {
  margin: 0;
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.effects {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 0;
  padding: 0;
  list-style: none;
  flex: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 5px;
  border: 1px solid var(--line2);
  font-size: 8px;
  letter-spacing: 0.12em;
  color: #dcdcdc;
}

.chip i {
  display: block;
  width: 26px;
  height: 2px;
  background: #2a2a2a;
}

.chip b {
  display: block;
  height: 100%;
  background: var(--fg);
}

.chip.fijo {
  background: var(--fg);
  color: #000;
  border-color: var(--fg);
}

.chip.fijo b {
  background: #000;
}

/* ajustes de tamaño */

@media (max-width: 760px) {
  .inicio,
  .modos-cuerpo {
    grid-template-columns: minmax(0, 1fr) 148px;
    gap: 14px;
  }

  .inicio-demo canvas {
    max-width: 132px;
  }

  .inicio-demo .nota {
    display: none;
  }
}

/* en pantallas pequeñas no hay sitio para la vista previa */
@media (max-width: 620px) {
  .inicio-demo {
    display: none;
  }

  .modos-cuerpo {
    grid-template-columns: minmax(0, 1fr);
  }

  .tab {
    min-width: 0;
    padding: 7px 4px;
    font-size: 8px;
    letter-spacing: 0.1em;
  }
}

@media (max-width: 620px) {
  .niveles-cuerpo {
    grid-template-columns: minmax(0, 1fr);
  }

  .vistazo {
    display: none;
  }

  .celda {
    min-height: 56px;
    padding: 6px;
  }
}

@media (max-width: 420px) {
  .brand {
    font-size: 11px;
    letter-spacing: 0.2em;
  }

  .version {
    margin-left: 5px;
    padding-left: 5px;
    font-size: 7px;
  }

  #lang-switch {
    min-width: 35px;
    padding-inline: 4px;
    font-size: 8px;
  }

  .tool {
    padding: 4px 6px;
    font-size: 8px;
  }

  .tool#btn-mute span {
    display: none;
  }

  .meta {
    max-width: 34vw;
  }

  .label {
    max-width: 56vw;
  }

  .fin {
    padding: 14px;
  }
}

@media (pointer: coarse) {
  .row:hover:not(.sel) {
    background: #000;
    color: var(--fg);
  }

  .row:hover:not(.sel) .row-idx,
  .row:hover:not(.sel) .row-name small,
  .row:hover:not(.sel) .row-right {
    color: var(--muted);
  }

  .acciones button:hover:not(.principal) {
    background: #000;
    color: var(--fg);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
  }
}

/* BORRAR-COMPETITIVO · estilos de salas, rangos y minis retirados para v1.0. */

/* ═══════════════════════════════════════════════════════════════════════════
   transición de bloques entre pantallas
   ═══════════════════════════════════════════════════════════════════════════ */

#barrido {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  /* cubos nítidos, sin suavizar */
  image-rendering: pixelated;
}

/* BORRAR-COMPETITIVO · efectos de ascenso retirados para v1.0. */