/* ==========================================================================
   TAIXU — Estilos base compartilhados
   Variáveis de tema, reset e fundo comuns a todas as páginas.
   ========================================================================== */

:root {
  /* Cores de tema */
  --bg-color: #0b0d17;
  --panel-bg: rgba(20, 25, 45, 0.85);
  --accent-p1: #00f0ff;
  --accent-p2: #ff0055;
  --accent-purple: #9d00ff;
  --core-glow: rgba(150, 0, 255, 0.4);
  --gold: #ffd700;
  --text-color: #e0e6ed;
  --text-muted: #a0aab8;

  /* Tipografia */
  --font-base: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  /* Espaçamentos / raios reutilizáveis */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 16px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  background-color: var(--bg-color);
  background-image:
    radial-gradient(circle at 50% 50%, rgba(30, 15, 60, 0.6) 0%, rgba(5, 5, 15, 0.9) 100%),
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 40px 40px, 40px 40px;
  background-attachment: fixed;
  color: var(--text-color);
  font-family: var(--font-base);
  min-height: 100vh;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

/* Impede seleção acidental de texto em elementos de interface do jogo,
   preservando a seleção onde ela é útil (ex.: conteúdo das regras). */
.no-select {
  -webkit-user-select: none;
  user-select: none;
}

/* Título com gradiente neon reutilizável */
.neon-title {
  letter-spacing: 2px;
  text-transform: uppercase;
  background: linear-gradient(45deg, var(--accent-p1), var(--accent-purple), var(--accent-p2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent-p1); /* Fallback caso o clipping não seja suportado */
  text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

/* Acessibilidade: respeita usuários que preferem menos movimento */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Foco visível para navegação por teclado */
:focus-visible {
  outline: 2px solid var(--accent-p1);
  outline-offset: 2px;
}

/* Botão de som — fixo, presente em todas as telas (lobby, tabuleiro, regras) */
.sound-toggle-btn {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 200;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--panel-bg);
  border: 1px solid rgba(0, 240, 255, 0.35);
  color: var(--text-color);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.sound-toggle-btn:hover,
.sound-toggle-btn:focus-visible {
  transform: scale(1.08);
  border-color: var(--accent-p1);
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
}

.sound-toggle-btn.muted {
  border-color: rgba(255, 0, 85, 0.4);
  color: var(--text-muted);
  box-shadow: 0 0 15px rgba(255, 0, 85, 0.15);
}

/* Botão de ação genérico (usado em modais e telas de regras) */
.interactive-btn {
  background: linear-gradient(45deg, var(--accent-purple), #440066);
  color: #fff;
  border: 1px solid var(--accent-p1);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-weight: bold;
  margin: 4px;
  min-height: 44px;
  transition: box-shadow 0.2s ease;
}

.interactive-btn:hover,
.interactive-btn:focus-visible {
  box-shadow: 0 0 10px var(--accent-p1);
}

.interactive-btn.secondary { background: #444; }