/* ============================================================
   style.css — Sopa de Letras · Diseño mobile-first
   ============================================================ */

/* ─── Variables ─────────────────────────────────────────────── */
:root {
  /* Paleta */
  --color-bg:          #0d0d1a;
  --color-surface:     #1a1a30;
  --color-surface2:    #23234a;
  --color-border:      #3a3a6a;

  --color-primary:     #7c5cbf;
  --color-primary-glow:#9b7fe0;
  --color-accent:      #f0a500;
  --color-success:     #22c55e;
  --color-error:       #ef4444;
  --color-hint:        #38bdf8;
  --color-warning:     #f97316;

  --color-text:        #e2e8f0;
  --color-text-muted:  #94a3b8;
  --color-text-dark:   #0f172a;

  /* Tipografía */
  --font-sans:   -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono:   'SF Mono', 'Fira Code', monospace;
  --font-game:   var(--font-sans);

  /* Espaciado */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;

  /* Radios */
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-pill: 999px;

  /* Transiciones */
  --transition: 150ms ease;
  --transition-slow: 300ms ease;
}

/* ─── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  /* Fondo degradado sutil */
  background-image:
    radial-gradient(ellipse at top,    rgba(124,92,191,.25) 0%, transparent 60%),
    radial-gradient(ellipse at bottom, rgba(34,197,94,.08) 0%, transparent 60%);
  background-attachment: fixed;
}

/* ─── Pantallas ──────────────────────────────────────────────── */
.screen {
  display: none;
  width: 100%;
  max-width: 480px;
  min-height: 100dvh;
  flex-direction: column;
  padding: var(--space-md);
}

.screen.active {
  display: flex;
}

/* ============================================================
   PANTALLA DE INICIO
   ============================================================ */
#screen-start {
  justify-content: center;
  gap: var(--space-lg);
  padding: var(--space-xl) var(--space-md);
}

.start-header {
  text-align: center;
}

.start-logo {
  font-size: 3.5rem;
  margin-bottom: var(--space-sm);
  animation: float 3s ease-in-out infinite;
}

.start-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--color-primary-glow), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.start-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* Sección de selección */
.selection-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.selection-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  padding: 0 var(--space-xs);
}

.btn-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.btn-option {
  flex: 1;
  min-width: 80px;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition);
  user-select: none;
}

.btn-option:hover, .btn-option:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-text);
  background: var(--color-surface2);
}

.btn-option.active {
  border-color: var(--color-primary);
  background: rgba(124,92,191,.25);
  color: var(--color-primary-glow);
  box-shadow: 0 0 0 1px var(--color-primary) inset;
}

.difficulty-desc {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-align: center;
  min-height: 1.2em;
  padding: 0 var(--space-xs);
}

.btn-group-cat {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
}

.btn-cat {
  padding: var(--space-sm);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: all var(--transition);
  user-select: none;
}

.btn-cat .cat-icon { font-size: 1.4rem; }
.btn-cat .cat-name { font-size: 0.7rem; line-height: 1.2; }

.btn-cat:hover, .btn-cat:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-text);
}

.btn-cat.active {
  border-color: var(--color-primary);
  background: rgba(124,92,191,.25);
  color: var(--color-primary-glow);
}

/* Botón principal de inicio */
.btn-primary {
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--color-primary), #5b3fa6);
  border: none;
  border-radius: var(--radius-lg);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(124,92,191,.4);
  user-select: none;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(124,92,191,.55);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(124,92,191,.4);
}

/* ============================================================
   PANTALLA DE JUEGO
   ============================================================ */
#screen-game {
  padding: var(--space-sm) var(--space-md) var(--space-md);
  gap: var(--space-sm);
}

/* Encabezado del juego */
.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.game-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.game-meta-category {
  font-size: 0.95rem;
  font-weight: 700;
}

.game-meta-difficulty {
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

.game-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.timer-display {
  font-size: 0.9rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: var(--space-xs) var(--space-md);
  transition: color var(--transition), border-color var(--transition);
}

.timer-display.timer-warning {
  color: var(--color-warning);
  border-color: var(--color-warning);
  animation: pulse-warning 1s ease-in-out infinite;
}

/* Barra de progreso */
.progress-bar-wrap {
  background: var(--color-surface);
  border-radius: var(--radius-pill);
  height: 8px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-success));
  border-radius: var(--radius-pill);
  transition: width 400ms cubic-bezier(.4,0,.2,1);
  width: 0%;
}

.progress-text {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  text-align: right;
  margin-top: 2px;
}

/* ─── Cuadrícula de letras ───────────────────────────────────── */
.grid-wrapper {
  flex: 0 0 auto;
  width: 100%;
  aspect-ratio: 1 / 1;
  position: relative;
  touch-action: none; /* previene scroll mientras se selecciona */
}

#grid-container {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(var(--grid-size, 10), 1fr);
  grid-template-rows:    repeat(var(--grid-size, 10), 1fr);
  gap: 2px;
  user-select: none;
  -webkit-user-select: none;
}

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: clamp(0.65rem, 3.5vw, 1.1rem);
  font-weight: 700;
  font-family: var(--font-game);
  color: var(--color-text);
  cursor: pointer;
  transition:
    background var(--transition),
    color var(--transition),
    border-color var(--transition),
    transform var(--transition);
  line-height: 1;
}

/* Estados de las celdas */
.cell.selected {
  background: rgba(240, 165, 0, 0.25);
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: scale(1.05);
  z-index: 1;
}

.cell.found {
  background: rgba(34, 197, 94, 0.18);
  border-color: var(--color-success);
  color: var(--color-success);
}

.cell.error {
  background: rgba(239, 68, 68, 0.25);
  border-color: var(--color-error);
  color: var(--color-error);
  animation: shake 0.3s ease;
}

.cell.hint {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--color-hint);
  color: var(--color-hint);
  animation: hint-pulse 1.5s ease-in-out 2;
}

/* ─── Lista de palabras ──────────────────────────────────────── */
.word-list-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  min-height: 0;
}

.word-list-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
}

#word-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
  overflow-y: auto;
  padding-bottom: 2px;
}

.word-item {
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font-mono);
  padding: 4px var(--space-sm);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text);
  letter-spacing: 0.5px;
  transition: all var(--transition);
  white-space: nowrap;
}

.word-item.found {
  background: rgba(34, 197, 94, 0.15);
  border-color: var(--color-success);
  color: var(--color-success);
  text-decoration: line-through;
  opacity: 0.7;
}

/* ─── Barra de acciones ──────────────────────────────────────── */
.action-bar {
  display: flex;
  gap: var(--space-sm);
  padding-top: var(--space-xs);
}

.btn-action {
  flex: 1;
  padding: var(--space-sm);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  user-select: none;
}

.btn-action:hover, .btn-action:focus-visible {
  background: var(--color-surface2);
  border-color: var(--color-primary);
  color: var(--color-text);
}

.btn-action:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.hint-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  background: var(--color-primary);
  border-radius: 50%;
  font-size: 0.65rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

/* ============================================================
   PANTALLA DE RESULTADO
   ============================================================ */
#screen-result {
  justify-content: center;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
  padding: var(--space-xl) var(--space-md);
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
  box-shadow: 0 8px 40px rgba(0,0,0,.4);
}

.result-icon {
  font-size: 4rem;
  animation: bounce-in 0.5s cubic-bezier(.34,1.56,.64,1);
}

.result-title {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-glow), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-message {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.result-stats {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
}

.result-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.result-stat-value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
}

.result-stat-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: 100%;
}

.btn-secondary {
  width: 100%;
  padding: var(--space-md);
  background: transparent;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
  background: var(--color-surface2);
}

/* ============================================================
   ANIMACIONES
   ============================================================ */

@keyframes float {
  0%, 100% { transform: translateY(0);    }
  50%       { transform: translateY(-6px); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0);    }
  20%       { transform: translateX(-4px); }
  40%       { transform: translateX(4px);  }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px);  }
}

@keyframes pulse-warning {
  0%, 100% { opacity: 1;   }
  50%       { opacity: 0.6; }
}

@keyframes hint-pulse {
  0%, 100% { box-shadow: 0 0 0   0   rgba(56,189,248,.4); }
  50%       { box-shadow: 0 0 10px 4px rgba(56,189,248,.4); }
}

@keyframes bounce-in {
  0%   { transform: scale(0);    opacity: 0; }
  80%  { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(1);    }
}

/* Emoji de celebración al encontrar una palabra */
.celebrate-emoji {
  position: fixed;
  pointer-events: none;
  font-size: 1.8rem;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: celebrate-fly 0.9s ease forwards;
  z-index: 100;
}

@keyframes celebrate-fly {
  0%   { opacity: 1; transform: translate(-50%, -50%) scale(1);   }
  100% { opacity: 0; transform: translate(-50%, -200%) scale(1.8); }
}

/* ============================================================
   RESPONSIVE — pantallas muy pequeñas (<360px)
   ============================================================ */
@media (max-width: 360px) {
  .start-title { font-size: 1.8rem; }
  .btn-group-cat { grid-template-columns: repeat(4, 1fr); }
  .btn-cat .cat-name { font-size: 0.62rem; }
  .cell { border-radius: 4px; }
}

/* Pantallas más grandes — aprovechar espacio */
@media (min-width: 481px) {
  body { padding: var(--space-md) 0; }
  .screen { border-radius: var(--radius-lg); overflow: hidden; }
}

/* ============================================================
   SCROLLBAR personalizado
   ============================================================ */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 2px; }