:root {
    --font-banner: 'Fredoka', sans-serif;
    --font-i: "Libertinus Math", system-ui;
  }

  body {
    background-image: url('../assets/images/fondo.png');
    background-size: cover;
    background-attachment: fixed;
  }

  .navbar-custom {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 5px dashed var(--color-primary);
    border-radius: 0 0 2.5rem 2.5rem;
    box-shadow: var(--shadow-sm);
  }

  .navbar-brand {
    font-family: var(--font-title);
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--color-primary) !important;
  }

  .btn-back-home {
    background: var(--color-accent);
    border: 3px solid #fff;
    font-family: var(--font-title);
    font-size: 1.1rem;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    color: #fff !important;
    text-decoration: none;
    transition: all 0.2s ease;
  }

  .btn-back-home:hover {
    background: var(--color-primary);
    transform: scale(1.06);
  }

  .text-secondary {
    color: white !important;
  }

  .font-banner-vocales span {
    font-family: var(--font-banner);
    font-size: clamp(2.5rem, 8vw, 5.5rem);
    text-shadow: 4px 4px 0px rgba(0, 0, 0, 0.1);
    margin: 0 5px;
    display: inline-block;
    animation: bounce-letters 2s ease-in-out infinite alternate;
  }

  .font-banner-vocales span:nth-child(1) {
    animation-delay: 0.1s;
  }

  .font-banner-vocales span:nth-child(2) {
    animation-delay: 0.2s;
  }

  .font-banner-vocales span:nth-child(3) {
    animation-delay: 0.3s;
  }

  .font-banner-vocales span:nth-child(4) {
    animation-delay: 0.4s;
  }

  .font-banner-vocales span:nth-child(5) {
    animation-delay: 0.5s;
  }

  .font-banner-vocales span:nth-child(6) {
    animation-delay: 0.6s;
  }

  .font-banner-vocales span:nth-child(7) {
    animation-delay: 0.7s;
  }

  .font-banner-vocales span:nth-child(8) {
    animation-delay: 0.8s;
  }

  @keyframes bounce-letters {
    0% {
      transform: translateY(0) rotate(0deg);
    }

    100% {
      transform: translateY(-15px) rotate(5deg);
    }
  }

  .section-title {
    font-family: var(--font-title);
    color: var(--color-primary);
    text-shadow: 2px 2px 0px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
    font-weight: 700;
  }

  /* Vowel Card */
  .vowel-card {
    background: white;
    border-radius: 2rem;
    border: 4px dashed var(--color-border);
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
  }

  .vowel-card:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: var(--shadow-lg);
  }

  .vowel-letter {
    font-family: var(--font-banner);
    font-size: 4rem;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 0.5rem;
    text-shadow: 3px 3px 0px rgba(0, 0, 0, 0.1);
    display: inline-block;
    transition: transform 0.3s ease;
  }

  .vowel-card:hover .vowel-letter {
    transform: scale(1.15) rotate(-5deg);
  }

  .vowel-example {
    font-family: var(--font-title);
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0;
  }

  /* Interactive Showcase Display */
  .vowel-display-canvas {
    background: #fff;
    border: 6px dashed var(--color-primary);
    border-radius: 2.5rem;
    min-height: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.5s ease;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    padding: 2rem;
  }

  .vowel-display-emoji {
    font-size: 5.5rem;
    animation: float-deco 3s ease-in-out infinite;
    display: inline-block;
  }

  .vowel-display-letter {
    font-family: var(--font-banner);
    font-size: 5rem;
    font-weight: 900;
    color: #333;
    margin: 0.5rem 0;
    text-shadow: 4px 4px 0px rgba(0, 0, 0, 0.06);
  }

  .vowel-display-word {
    font-family: var(--font-title);
    font-size: 2rem;
    font-weight: 700;
    color: #555;
  }

  /* Tracing Chalkboard / Pizarra */
  .tracing-container {
    background: #2e3d30;
    /* School chalkboard color */
    border-radius: 2.5rem;
    border: 10px solid #8d6e63;
    /* Wooden frame */
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2), inset 0 0 30px rgba(0, 0, 0, 0.5);
    padding: 1.5rem;
    position: relative;
  }

  .chalkboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 2px dashed rgba(255, 255, 255, 0.2);
    padding-bottom: 0.5rem;
  }

  .chalkboard-title {
    font-family: var(--font-title);
    color: #fafafa;
    font-size: 1.3rem;
    margin: 0;
    font-weight: 700;
  }

  .chalk-colors {
    display: flex;
    gap: 10px;
  }

  .chalk-btn {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    border: 2px solid #fff;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
  }

  .chalk-btn.selected {
    transform: scale(1.25);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.4);
  }

  .tracing-canvas-wrapper {
    position: relative;
    width: 100%;
    height: 300px;
    background: transparent;
    border-radius: 1rem;
    overflow: hidden;
    touch-action: none;
    /* Prevent scrolling on mobile while drawing */
  }

  #tracingCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    z-index: 2;
  }

  .tracing-guide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-banner);
    font-size: 14rem;
    color: rgba(255, 255, 255, 0.18);
    /* Semi-transparent guide */
    user-select: none;
    z-index: 1;
    pointer-events: none;
  }

  .btn-clear-chalk {
    background: #d32f2f;
    color: #fff;
    font-family: var(--font-title);
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    transition: all 0.2s ease;
    font-weight: 700;
  }

  .btn-clear-chalk:hover {
    background: #b71c1c;
    transform: scale(1.05);
  }

  /* Word Vowel Quiz */
  .quiz-container {
    background: #fff;
    border-radius: 2.5rem;
    border: 5px dashed var(--color-secondary);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
  }

  .quiz-word-box {
    font-family: var(--font-banner);
    font-size: clamp(1.8rem, 8vw, 3.5rem);
    letter-spacing: clamp(3px, 1.2vw, 8px);
    margin: 1.5rem 0;
    color: #333;
    font-weight: 900;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: clamp(5px, 1.8vw, 15px);
    flex-wrap: wrap;
    /* Evita desbordamiento en pantallas muy chicas */
  }

  .quiz-letter-slot {
    border-bottom: clamp(3px, 0.8vw, 6px) solid var(--color-primary);
    width: clamp(32px, 8vw, 60px);
    height: clamp(40px, 10vw, 75px);
    display: inline-flex;
    justify-content: center;
    align-items: center;
    color: var(--color-accent);
    animation: flash-slot 1.5s infinite alternate;
  }

  @keyframes flash-slot {
    0% {
      border-color: var(--color-primary);
    }

    100% {
      border-color: var(--color-accent);
    }
  }

  .quiz-letter-slot.filled {
    border-bottom: none;
    animation: none;
    color: var(--color-success);
  }

  .quiz-word-emoji {
    font-size: 5rem;
    animation: float-deco 3s ease-in-out infinite;
    display: block;
    margin-bottom: 0.5rem;
  }

  .quiz-vowel-btn {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border: 4px solid #fff;
    font-family: var(--font-banner);
    font-size: 2rem;
    font-weight: 900;
    color: #fff;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.12);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  }

  .quiz-vowel-btn:hover {
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
  }

  .font-banner-vocales span:nth-child(1) {
    animation-delay: 0.1s;
    color: #ff1744;
  }

  .font-banner-vocales span:nth-child(2) {
    animation-delay: 0.2s;
    color: #0288d1;
  }

  .font-banner-vocales span:nth-child(3) {
    animation-delay: 0.3s;
    color: #f57f17;
  }

  .font-banner-vocales span:nth-child(4) {
    animation-delay: 0.4s;
    color: #2e7d32;
  }

  .font-banner-vocales span:nth-child(5) {
    animation-delay: 0.5s;
    color: #9c27b0;
  }

  .font-banner-vocales span:nth-child(6) {
    animation-delay: 0.6s;
    color: #ff1744;
  }

  .font-banner-vocales span:nth-child(7) {
    animation-delay: 0.7s;
    color: #0288d1;
  }

  .speech-badge {
    background: var(--color-primary);
    color: white;
    border-radius: 20px;
    padding: 5px 12px;
    font-size: 0.85rem;
    font-family: var(--font-body);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 10px;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    animation: palpitar 1.2s infinite;
  }

  @keyframes palpitar {
    0% {
      transform: scale(1);
      box-shadow: 0 0 0 rgba(255, 214, 0, 0.7);
    }

    50% {
      transform: scale(1.12);
      box-shadow: 0 0 25px rgba(255, 214, 0, 0.9);
    }

    100% {
      transform: scale(1);
      box-shadow: 0 0 0 rgba(255, 214, 0, 0.7);
    }
  }

  .speech-badge:hover {
    background: var(--color-accent);
    transform: scale(1.05);
  }

  /* Drag & Drop Classification Game */
  .drag-game-container {
    background: #fff;
    border-radius: 2.5rem;
    border: 5px dashed var(--color-primary);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
  }

  .drag-surprise-box {
    width: 170px;
    height: 170px;
    border-radius: 2rem;
    border: 4px dashed #ddd;
    background: #fbfbfb;
    margin: 0 auto 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
  }

  .draggable-card {
    width: 140px;
    height: 140px;
    border-radius: 1.5rem;
    background: #fff;
    border: 4px solid var(--color-primary);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: grab;
    position: absolute;
    user-select: none;
    touch-action: none;
    z-index: 10;
  }

  .draggable-card.dragging {
    cursor: grabbing;
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
    z-index: 100;
  }

  .draggable-card-emoji {
    font-size: 4rem;
    line-height: 1;
    margin-bottom: 5px;
  }

  .draggable-card-label {
    font-family: var(--font-title);
    font-size: 1.1rem;
    font-weight: 700;
    color: #333;
    margin: 0;
  }

  /* Baskets Grid */
  .basket-slot {
    width: 100px;
    height: 100px;
    border-radius: 2rem;
    border: 4px solid var(--color-border);
    background: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    margin: 0 auto;
  }

  .basket-slot:hover,
  .basket-slot.drag-over {
    transform: scale(1.12);
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.95);
  }

  .basket-slot.correct-snap {
    animation: success-pulse 0.6s ease-in-out;
  }

  .basket-letter {
    font-family: var(--font-banner);
    font-size: 3rem;
    font-weight: 900;
    line-height: 1;
    color: var(--color-border);
    text-shadow: 2px 2px 0px rgba(0, 0, 0, 0.05);
  }

  .basket-slot.incorrect {
    border-color: var(--color-danger) !important;
    background: #ffebee;
    animation: shake 0.5s ease-in-out;
  }