/* Definición de variables de color */
:root {
    --primary-text-color: #5a287d;
    --accent-color: #ff4d8b;
    --accent-dark-color: #c13967;
    --secondary-color: #9966cc;
    --secondary-dark-color: #5a287d;
    --light-bg-color: #f8e6ff;
    --light-accent-bg: #ffd6eb;
    --light-secondary-bg: #e0f7ff;
    --white-color: #ffffff;
    --black-color: #000000;
    --button-color: #ff4d8b;
    --button-hover-color: #ff6b9e;
    --title-color: #5a287d;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
body {
    font-family: 'Bubblegum Sans', cursive;
    background-color: var(--light-bg-color);
    color: var(--primary-text-color);
    overflow: hidden;
    height: 100vh;
    height: 100dvh; /* modern browsers: account for dynamic UI */
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  #game-container {
    /* Maintain 3:2 aspect while fitting viewport */
    width: min(
      98vw,
      900px,
      calc((100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 8px) * 1.5)
    );
    max-width: 900px;
    aspect-ratio: 3 / 2;
    height: auto;
    max-height: calc(100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 8px);
    position: relative;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    overflow: hidden;
    background-color: var(--light-secondary-bg); /* Fondo base por si falla la imagen */
  }

  /* Fit-height mode for portrait phones: width driven by available height */
  #game-container.fit-height {
    width: min(
      100vw,
      calc((100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom)) * 1.5)
    );
    max-width: none;
  }
  
  .screen {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-size: cover;
    background-position: center;
    padding: 20px;
    /* safe-area fallbacks for iOS */
    padding-top: calc(20px + constant(safe-area-inset-top));
    padding-top: calc(20px + env(safe-area-inset-top));
    padding-bottom: calc(20px + constant(safe-area-inset-bottom));
    padding-bottom: calc(20px + env(safe-area-inset-bottom)); /* evitar recortes en móviles */
    overflow: auto; /* permitir scroll cuando el contenido es más alto */
    /* Estilos para la transición de fundido */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease-in-out, visibility 0s linear 0.5s;
  }

/* Character select: avoid scroll by making contents more compact */
#character-select-screen {
  overflow: hidden;
  padding: 12px;
  /* safe-area for top/bottom on compact layout */
  padding-top: calc(12px + constant(safe-area-inset-top));
  padding-top: calc(12px + env(safe-area-inset-top));
  padding-bottom: calc(12px + constant(safe-area-inset-bottom));
  padding-bottom: calc(12px + env(safe-area-inset-bottom));
}
  
  .screen.visible {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease-in-out;
    z-index: 1; /* Asegura que la pantalla visible esté por encima */
  }
  
  /* Estilo específico para que math-problem no interfiera con transiciones */
  #math-problem-container.hidden {
    display: none;
  }
  
  #start-screen {
    background-image: url('assets/menu_bg.png');
    background-size: 100% 100%;  /* Cambiar de 'cover' a '100% 100%' */
    background-position: center top;  /* Alinear desde arriba */
    background-repeat: no-repeat;
    text-align: center;
  }
  
  #start-screen h1 {
    font-size: clamp(24px, 6vw, 48px);
    color: var(--accent-color);
    text-shadow: 3px 3px 0 var(--white-color), -1px -1px 0 var(--white-color), 1px -1px 0 var(--white-color),
      -1px 1px 0 var(--white-color), 1px 1px 0 var(--white-color);
    margin-bottom: 20px;
  }
  
  .character-display {
    margin: 20px 0;
  }
  
  .princess-img {
    height: 200px;
    animation: float 2s ease-in-out infinite;
  }
  
  @keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
  }
  
  button {
    background-color: var(--accent-color);
    color: var(--white-color);
    border: none;
    border-radius: 25px;
    padding: 12px 25px;
    font-size: 1.2rem;
    font-family: 'Bubblegum Sans', cursive;
    margin: 10px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 0 var(--accent-dark-color);
  }
  
  button:hover {
    background-color: #ff6b9e; /* Un poco más claro al hacer hover */
    transform: translateY(-2px);
  }
  
  button:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--accent-dark-color);
  }
  
  /* Instructions Screen */
  #instructions-screen {
    background-color: var(--light-accent-bg);
    text-align: center;
  }
  
  #instructions-screen h2 {
    font-size: clamp(20px, 5vw, 40px);
    color: var(--primary-text-color);
    margin-bottom: 30px;
  }
  
  .instructions-content {
    background-color: var(--white-color);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    width: 80%;
    max-width: 500px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }
  
  .instructions-content p {
    font-size: 1.2rem;
    margin: 15px 0;
    text-align: left;
  }
  
  /* Level Select Screen */
  #level-select-screen {
    background-color: var(--light-secondary-bg);
    text-align: center;
  }
  
  #level-select-screen h2 {
    font-size: clamp(20px, 5vw, 40px);
    color: var(--primary-text-color);
    margin-bottom: 30px;
  }
  
  .level-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
    width: 80%;
    max-width: 600px;
  }
  
  .level-button {
    background-color: var(--secondary-color);
    min-height: 60px; /* Usa min-height para mejor adaptabilidad */
    box-shadow: 0 4px 0 var(--secondary-dark-color);
    padding: 10px; /* Añade padding para texto largo */
  }
  
  .level-button:hover {
    background-color: #b088e0; /* Más claro en hover */
  }
  
  /* Game Screen */
  #game-screen {
    background-color: #c8f7ff; /* Color de fondo si la imagen no carga */
    padding: 0;
    /* Hereda display flex de .screen, pero lo anulamos para el canvas */
    display: block;
    /* Aseguramos que esté sobre otras pantallas NO visibles */
    z-index: 2;
    overflow: hidden; /* el juego no debe desplazar */
  }
  
  #game-ui {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    /* fallback first for older iOS */
    padding-top: calc(10px + constant(safe-area-inset-top));
    padding: calc(10px + env(safe-area-inset-top)) 15px 10px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.7);
    z-index: 10; /* UI sobre el canvas */
    font-weight: bold;
  }
  
  #game-ui div {
    font-size: clamp(12px, 2.2vw, 18px);
    color: var(--primary-text-color);
  }
  
  #pause-button {
    padding: 5px 15px;
    font-size: 1rem;
    margin: 0; /* Quita margen si interfiere */
  }
  
  #game-world {
    width: 100%;
    height: 100%;
    position: relative; /* Para que el canvas se posicione correctamente */
  }
  
  #game-canvas {
    display: block; /* Evita espacio extra bajo el canvas */
    width: 100%;
    height: 100%;
  }
  
  /* Math Problem Container */
  #math-problem-container {
    position: absolute;
    /* safe-area bottom with legacy fallback */
    bottom: calc(20px + constant(safe-area-inset-bottom));
    bottom: calc(20px + env(safe-area-inset-bottom));
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--white-color);
    border-radius: 15px;
    padding: 15px 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    text-align: center;
    z-index: 20; /* Encima del juego */
    width: 90%;
    max-width: 450px;
  }
  
  #problem-text {
    font-size: clamp(16px, 4.5vw, 28px);
    margin-bottom: 15px;
    color: var(--primary-text-color);
  }
  
  #answer-options {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
  }
  
  .answer-option {
    background-color: var(--secondary-color);
    color: var(--white-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(14px, 3.6vw, 22px);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 3px 0 var(--secondary-dark-color);
  }
  
  .answer-option:hover {
    background-color: #b088e0; /* Más claro en hover */
    transform: translateY(-2px);
  }
  
  /* Pause Screen */
  #pause-screen {
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 30; /* Encima de todo excepto quizás modales futuros */
  }
  
  #pause-screen h2 {
    font-size: clamp(22px, 5.5vw, 42px);
    color: var(--white-color);
    margin-bottom: 30px;
  }
  
  /* Level Complete Screen */
  #level-complete-screen {
    background-color: #fffce0;
    text-align: center;
  }
  
  #level-complete-screen h2 {
    font-size: clamp(22px, 5.5vw, 42px);
    color: var(--accent-color);
    margin-bottom: 20px;
  }
  
  .level-stats {
    background-color: var(--white-color);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    width: 80%;
    max-width: 400px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }
  
  .level-stats p {
    font-size: 1.3rem;
    margin: 10px 0;
    color: var(--primary-text-color);
  }
  
  /* Game Over Screen */
  #game-over-screen {
    background-color: #ffe0e0;
    text-align: center;
  }
  
  #game-over-screen h2 {
    font-size: clamp(22px, 5.5vw, 42px);
    color: var(--accent-color);
    margin-bottom: 20px;
  }
  
  #game-over-screen p {
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: var(--primary-text-color);
  }
  
  /* Responsive Design */
  @media (max-width: 920px) {
    /* Container already fits viewport via aspect-ratio and max-height */
  
    #start-screen h1, #pause-screen h2, #level-complete-screen h2, #game-over-screen h2 {
      font-size: 2.5rem;
    }
  }
  
  @media (max-width: 600px) {
    #start-screen h1, #pause-screen h2, #level-complete-screen h2, #game-over-screen h2 {
      font-size: 2rem;
    }
  
    .princess-img {
      height: 150px;
    }
  
    .level-buttons {
       grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
       gap: 10px;
    }
  
     button {
      padding: 10px 20px;
      font-size: 1rem;
    }
  
    #game-ui div { font-size: clamp(11px, 2.6vw, 16px); }
    #pause-button { font-size: 0.9rem; padding: 4px 10px; }
    #problem-text { font-size: clamp(15px, 4.7vw, 24px); }
    .answer-option { width: 50px; height: 50px; font-size: 1.2rem; }
  }

  /* Extra small devices: tighten paddings to avoid clipping */
  @media (max-width: 480px) {
    #game-ui {
      padding-top: calc(6px + env(safe-area-inset-top));
      padding: calc(6px + env(safe-area-inset-top)) 10px 6px 10px;
    }
    #math-problem-container {
      padding: 10px 12px;
    }
    .answer-option { width: 44px; height: 44px; font-size: clamp(12px, 4vw, 18px); }
  }
  
  @media (max-height: 500px) {
     .princess-img { height: 120px; }
     #start-screen h1 { font-size: 1.8rem; margin-bottom: 10px;}
     button { padding: 8px 15px; font-size: 0.9rem; margin: 5px;}
     .level-buttons { gap: 8px; }
     .level-button { min-height: 50px; }
  }
  
  /* Ajustes para garantizar la distribución horizontal */
  #character-select-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    height: 100%;
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
    background-color: var(--light-accent-bg);
  }
  
  /* Contenedor de las opciones de personajes */
  .character-options {
    display: flex;
    flex-direction: row; /* Horizontal, permitiendo salto de línea */
    justify-content: center;
    align-items: stretch; /* Igualar altura por fila */
    width: 100%;
    gap: 12px;
    padding: 0 12px;
    flex-wrap: wrap; /* Evitar scroll mostrando varias filas */
    margin-top: 12px;
    margin-bottom: 12px; /* Separación del botón Back */
  }
  
  /* Cada tarjeta de personaje */
  .character-option {
    flex: 1 1 220px; /* Tarjetas flexibles */
    min-width: 180px;
    max-width: 280px;
    width: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start; /* Contenido arriba; el botón se ancla abajo */
    min-height: 320px; /* Más compactas para evitar scroll */
    background-color: var(--white-color);
    border-radius: 15px;
    padding: 16px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    margin: 0;
    box-sizing: border-box;
  }
  
  /* Ajustes para las imágenes */
  .character-option img {
    width: 110px;
    height: 140px;
    object-fit: contain;
    margin-bottom: 15px;
  }

  /* Normalizar la descripción opcional (como en Luna) */
  .character-option > p {
    min-height: 1.2em;
    margin: 4px 0 0;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
  }

  /* Asegurar altura similar de estadísticas entre tarjetas */
  .character-stats {
    min-height: 60px;
    margin-bottom: 8px; /* Espacio con el botón */
  }
  
  /* Ajustes para pantallas más pequeñas */
  @media (max-width: 768px) {
    .character-options {
        flex-direction: row;
        padding: 8px 12px;
    }

    .character-option {
        flex: 1 1 150px; /* Más compactas en móviles */
        margin: 0 8px 8px;
        padding: 12px;
        min-height: 280px; /* Igualar alturas en móvil pero permitiendo crecer */
    }

    .character-option img {
        width: 80px;
        height: 100px;
    }

    .character-stats { min-height: 48px; }
  }
  
  /* Estilos para las estadísticas */
  .character-stats {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 15px 0;
  }
  
  .character-stats span {
    font-size: 0.9em;
    padding: 5px 10px;
    background-color: var(--light-accent-bg);
    border-radius: 15px;
    white-space: nowrap;
  }
  
  /* Botón de selección */
  .select-character-btn {
    width: 100%;
    margin-top: auto; /* Ancla el botón al fondo de la tarjeta */
  }

  /* Evitar solapamiento del botón Back con las tarjetas */
  #back-from-character-select {
    align-self: center;
    margin-top: 24px;
  }
  
  #return-to-menu-button {
    display: none; /* Se mostrará solo en el último nivel */
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1.2em;
    background-color: var(--button-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  #return-to-menu-button:hover {
    background-color: var(--button-hover-color);
  }
  
  #level-complete-message {
    font-size: 2em;
    color: var(--title-color);
    margin-bottom: 30px;
    text-align: center;
  }