/* =====================================================================
   SNAKE · ESTILOS
   Interfaz responsive para móvil, tablet y PC.
   ===================================================================== */

/* ---------- Reset básico ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
}

body {
  min-height: 100%;
}

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

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* ---------- Tokens de diseño ---------- */
:root {
  --color-bg: #d7d0bb;
  --color-bg-soft: #b2ac9b;
  --color-surface: rgba(201, 190, 157, 0.666);
  --color-text: #2a2414;
  --color-text-muted: #5a4f42;
  --color-border: #8a7d68;

  --color-accent: #6b7fa1;
  --color-accent-dark: #556278;
  --color-accent-soft: #d4cfc0;
  --control-surface: rgba(200, 190, 165, 0.88);
  --control-border: rgba(90, 79, 66, 0.28);
  --control-icon: #3a3026;
  --color-berry: #a5553f;
  --color-sky: #6b8fa0;
  --color-danger: #945e50;
  --board-a: #a49e7c;
  --board-b: #96905c;
  --board-dot: rgba(80, 70, 40, 0.15);
  --snake-head: #5a6b8a;
  --snake-body: #707d98;
  --snake-tail: #8a98b0;
  --snake-eye: #f5f1e8;
  --snake-pupil: #262013;
  --food-color: #a55038;
  --food-shine: #f5dca0;

  --shadow-sm: 0 1px 2px rgba(20, 20, 18, 0.08);
  --shadow-md: 0 18px 45px rgba(53, 42, 27, 0.12);
  --shadow-lg: 0 24px 60px rgba(20, 20, 18, 0.16);

  --radius-sm: 8px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --radius-pill: 999px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --fs-xs: 0.75rem;
  --fs-sm: 0.85rem;
  --fs-base: 1rem;
  --fs-lg: 1.15rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 2rem;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast: 140ms var(--ease);
  --t-base: 220ms var(--ease);
}

/* ---------- Modo oscuro automático ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
  }
}

html[data-theme="dark"] {
  --color-bg: #1a1d1f;
  --color-bg-soft: #242730;
  --color-surface: #2a2d31;
  --color-text: #e8e6e1;
  --color-text-muted: #a9a8a4;
  --color-border: #3a3d41;

  --color-accent: #34c172;
  --color-accent-dark: #28a15f;
  --color-accent-soft: rgba(52, 193, 114, 0.14);
  --color-berry: #e8956f;
  --color-sky: #72b8a0;
  --color-danger: #d97a6f;
  --board-a: #2d3036;
  --board-b: #262a2f;
  --board-dot: rgba(255, 255, 255, 0.08);
  --snake-head: #e5e2db;
  --snake-body: #d4d1c8;
  --snake-tail: #c2bfb4;
  --snake-eye: #1a1d1f;
  --snake-pupil: #0f1113;
  --food-color: #f5a563;
  --food-shine: #ffe4c4;

  --control-surface: rgba(255, 255, 255, 0.07);
  --control-border: rgba(255, 255, 255, 0.14);
  --control-icon: #dddad2;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

/* ---------- Base ---------- */
body {
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.24), transparent 34%),
    linear-gradient(135deg, rgba(52, 64, 29, 0.16), transparent 42%),
    var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  transition: background var(--t-base), color var(--t-base);
  overflow-x: hidden;
}

h1, h2 {
  font-weight: 700;
  letter-spacing: 0;
}

[hidden] {
  display: none !important;
}

/* ---------- Layout general ---------- */
.app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: max(var(--space-4), env(safe-area-inset-top)) max(var(--space-4), env(safe-area-inset-right)) max(var(--space-4), env(safe-area-inset-bottom)) max(var(--space-4), env(safe-area-inset-left));
  gap: var(--space-4);
}

/* ---------- Encabezado ---------- */
.app-header {
  width: 100%;
  max-width: 720px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background:
    radial-gradient(circle at 68% 32%, #ffffff 0 7%, transparent 8%),
    linear-gradient(135deg, var(--snake-head), var(--food-color));
  box-shadow: 0 0 0 6px var(--color-accent-soft), var(--shadow-sm);
}

.brand-name {
  font-size: var(--fs-xl);
}

.brand-subtitle {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  line-height: 1.35;
}

.score-panel {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-5);
  box-shadow: var(--shadow-sm);
}

.score-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 56px;
}

.score-label {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.score-value {
  font-size: var(--fs-lg);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.score-value.score-pop {
  animation: scorePop 320ms var(--ease);
}

.score-divider {
  width: 1px;
  height: 24px;
  background: var(--color-border);
}

/* ---------- Área principal ---------- */
.game-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
}

.game-card {
  width: 100%;
  max-width: 720px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.game-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 38px;
}

.icon-btn {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--control-surface);
  border: 1px solid var(--control-border);
  color: var(--control-icon);
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast), border-color var(--t-fast);
}

.icon-btn:hover {
  background: rgba(215, 210, 195, 0.98);
  color: var(--color-text);
}

html[data-theme="dark"] .icon-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-text);
}

html[data-theme="light"] .mobile-control-btn {
  background: rgba(210, 200, 180, 0.92);
  border-color: rgba(80, 70, 55, 0.3);
}

html[data-theme="dark"] .mobile-control-btn {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.icon-btn:active {
  transform: scale(0.92);
}

/* Alternancia de iconos según estado (aria-pressed) */
.icon-sound-off,
.icon-play,
.icon-sun {
  display: none;
}

#soundToggle[aria-pressed="false"] .icon-sound-on {
  display: none;
}
#soundToggle[aria-pressed="false"] .icon-sound-off {
  display: block;
}

#pauseBtn[aria-pressed="true"] .icon-pause {
  display: none;
}
#pauseBtn[aria-pressed="true"] .icon-play {
  display: block;
}

html[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

html[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

/* ---------- Tablero del juego ---------- */
.game-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: min(68dvh, 560px);
  margin: 0 auto;
  border-radius: var(--radius-md);
  background: var(--board-a);
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.18);
  overflow: hidden;
  touch-action: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-controls {
  display: none;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  gap: 0.6rem;
  justify-items: center;
  align-items: center;
  padding: 0.95rem 0.5rem 0.5rem;
  border-top: 1px solid var(--color-border);
}

#gameCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: auto;
  display: block;
}

.mobile-controls-grid {
  display: grid;
  width: min(100%, 250px);
  grid-template-columns: 1fr 72px 1fr;
  grid-template-rows: 72px 72px;
  grid-template-areas:
    ". up ."
    "left down right";
  gap: 0.75rem;
  justify-content: center;
  align-content: center;
}

.mobile-control-btn,
.mobile-control-placeholder {
  width: 72px;
  height: 72px;
}

.mobile-control-up {
  grid-area: up;
}

.mobile-control-left {
  grid-area: left;
}

.mobile-control-down {
  grid-area: down;
}

.mobile-control-right {
  grid-area: right;
}

.mobile-control-btn {
  border: 1px solid var(--control-border);
  border-radius: 18px;
  background: var(--control-surface);
  color: var(--control-icon);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  transition: transform var(--t-fast), background var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast);
}

.mobile-control-btn:active {
  transform: scale(0.96);
}

.mobile-control-placeholder {
  width: 100%;
  height: 100%;
}

/* ---------- Paneles superpuestos (inicio / pausa / game over) ---------- */
.overlay-panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-3);
  padding: var(--space-6);
  background: rgba(145, 135, 115, 0.91);
  backdrop-filter: blur(6px);
  animation: fadeInScale var(--t-base);
}

@media (prefers-color-scheme: dark) {
  .overlay-panel {
    background: rgba(42, 46, 40, 0.9);
  }
}

html[data-theme="light"] .overlay-panel {
  background: rgba(168, 157, 135, 0.501);
  color: var(--color-text);
}

html[data-theme="dark"] .overlay-panel {
  background: rgba(42, 45, 50, 0.92);
  color: #e8e6e1;
}

.overlay-panel h2 {
  font-size: var(--fs-xl);
}

.overlay-panel p {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  max-width: 30ch;
  line-height: 1.5;
}

.final-score-line #finalScore {
  color: var(--color-text);
  font-weight: 700;
}

.new-record-badge {
  color: var(--color-accent-dark) !important;
  background: var(--color-accent-soft);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--fs-xs) !important;
  animation: scorePop 420ms var(--ease);
}

.btn-primary {
  margin-top: var(--space-2);
  background: var(--color-accent);
  color: #ffffff;
  font-weight: 600;
  font-size: var(--fs-base);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  transition: background var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: scale(0.96);
}

.hint-text {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  text-align: center;
}

@media (hover: none) and (pointer: coarse) {
  .hint-text {
    display: none;
  }

  .mobile-controls {
    display: grid;
  }

  .game-card {
    padding-bottom: 0.5rem;
  }

  .game-stage {
    width: 100%;
    max-width: min(90vw, 85dvh);
    margin: 0 auto;
    transform: none;
  }

  .mobile-control-btn {
    width: 72px;
    height: 72px;
    font-size: 1.3rem;
  }
}

/* ---------- Pie de página ---------- */
.app-footer {
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
  text-align: center;
}

.orientation-lock {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: none;
  place-items: center;
  align-content: center;
  gap: var(--space-4);
  padding: var(--space-5);
  text-align: center;
  background: var(--color-bg);
  color: var(--color-text);
}

.orientation-lock p {
  color: var(--color-text-muted);
  max-width: 28ch;
  line-height: 1.5;
}

.phone-rotate {
  width: 70px;
  height: 112px;
  border: 5px solid var(--color-accent);
  border-radius: 18px;
  display: grid;
  place-items: end center;
  padding: 8px;
  animation: rotatePhone 1.7s var(--ease) infinite;
}

.phone-rotate span {
  width: 18px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

/* ---------- Animaciones ---------- */
@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes scorePop {
  0% { transform: scale(1); }
  40% { transform: scale(1.25); }
  100% { transform: scale(1); }
}

@keyframes rotatePhone {
  0%, 20% {
    transform: rotate(90deg);
  }
  55%, 100% {
    transform: rotate(0deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- Accesibilidad ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  .app {
    justify-content: flex-start;
    gap: 8px;
    padding: max(8px, env(safe-area-inset-top)) max(6px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(6px, env(safe-area-inset-left));
  }

  .brand-name {
    font-size: var(--fs-lg);
  }

  .brand-subtitle,
  .app-footer {
    display: none;
  }

  .app-header {
    gap: 8px;
    max-width: none;
    flex-wrap: nowrap;
  }

  .score-panel {
    padding: 3px 10px;
    gap: 8px;
    flex-shrink: 0;
  }

  .score-item {
    min-width: 42px;
  }

  .score-label {
    font-size: 0.64rem;
  }

  .score-value {
    font-size: 1rem;
  }

  .game-wrap {
    gap: 8px;
    align-items: stretch;
  }

  .game-card {
    width: 100%;
    max-width: none;
    padding: 8px 8px 6px 8px;
    border-radius: var(--radius-md);
    gap: 6px;
    box-shadow: var(--shadow-sm);
  }

  .game-stage {
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: min(90vw, 85dvh);
    margin: 0 auto;
    transform: none;
  }

  .game-toolbar {
    min-height: 34px;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .icon-btn {
    width: 44px;
    height: 44px;
    border: 1px solid var(--control-border);
    background: var(--control-surface);
  }
}

@media (max-width: 480px) {
  .game-stage {
    transform: none;
  }

  .btn-primary {
    font-size: 1rem;
    padding: 0.95rem 1.3rem;
  }
}

@media (hover: none) and (pointer: coarse) {
  .mobile-controls {
    display: grid;
  }

  .game-card {
    padding-bottom: 0.5rem;
  }
}
@media (min-width: 900px) {
  .game-card {
    max-width: 720px;
  }

  .game-stage {
    max-width: min(66dvh, 560px);
  }
}

@media (max-height: 720px) and (orientation: portrait) {
  .app {
    justify-content: flex-start;
  }

  .game-stage {
    max-width: none;
  }
}

@media (hover: none) and (pointer: coarse) and (orientation: landscape) and (max-height: 520px) {
  .orientation-lock {
    display: grid;
  }

  .app {
    filter: blur(3px);
    pointer-events: none;
    user-select: none;
  }
}