body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
    background: linear-gradient(120deg, #f7fafc 0%, #e3f0ff 100%);
    min-height: 100vh;
    -webkit-overflow-scrolling: touch;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: manipulation;
}

.header-logo {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 2.2em;
    margin-bottom: 0.5em;
}

.header-logo img {
    height: 70px;
    max-width: 90vw;
    object-fit: contain;
    filter: drop-shadow(0 2px 8px rgba(33,147,176,0.13));
}

h1 {
    text-align: center;
    margin-top: 0.2em;
    margin-bottom: 1.2em;
    font-size: 2.1em;
    color: #0f2027; /* Color más oscuro para mejor contraste */
    letter-spacing: 1px;
    line-height: 1.2;
    padding: 0 0.5em;
    font-weight: 600; /* Texto más pesado para mejor legibilidad */
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.8em;
        margin-bottom: 1em;
        padding: 0 0.3em;
        color: #0f2027;
        font-weight: 600;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.6em;
        margin-bottom: 0.8em;
        padding: 0 0.2em;
        letter-spacing: 0.5px;
        color: #0f2027;
        font-weight: 600;
    }
}

.container {
    max-width: 480px;
    margin: 0 auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(33,147,176,0.10);
    padding: 1.5em 1.2em 3.5em 1.2em;
    margin-bottom: 4.5em;
}

/* Media queries para pantallas pequeñas */
@media (max-width: 768px) {
    .container {
        margin: 0 0.8em 4.5em 0.8em;
        padding: 1.2em 1em 3.5em 1em;
        border-radius: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        margin: 0 0.5em 4.5em 0.5em;
        padding: 1em 0.8em 3.5em 0.8em;
        border-radius: 8px;
    }
}

/* Mejoras específicas para pantallas de escritorio */
@media (min-width: 769px) {
    .container {
        margin: 0 auto 4.5em auto;
        padding: 2em 1.5em 3.5em 1.5em;
    }
    
    #question {
        text-align: center;
        font-size: 1.3rem;
        margin-bottom: 1.5rem;
    }
    
    #score {
        text-align: center;
        font-size: 1.3em;
    }
    
    #next-btn {
        display: block;
        margin: 1.5rem auto 0 auto;
        padding: 1rem 2rem;
    }
    
    .level-select,
    .quick-select {
        text-align: center;
    }
    
    /* Centrar mejor los botones de respuesta en desktop */
    #answers {
        max-width: 400px;
        margin: 0 auto;
    }
    
    #answers button {
        text-align: center;
        padding: 1rem;
        font-size: 1.1rem;
    }
}

/* Pantallas muy grandes */
@media (min-width: 1200px) {
    .container {
        max-width: 520px;
        padding: 2.5em 2em 4em 2em;
    }
    
    h1 {
        font-size: 2.3em;
    }
    
    #question {
        font-size: 1.4rem;
    }
}

#question {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: #0f2027; /* Color más oscuro */
    font-weight: 500; /* Peso medio para mejor legibilidad */
    line-height: 1.4; /* Mejor espaciado entre líneas */
}

#answers button {
    display: block;
    width: 100%;
    margin: 0.5rem 0;
    padding: 1rem 0.75rem;
    border: none;
    border-radius: 8px;
    background: #2193b0;
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    min-height: 44px; /* Tamaño mínimo para touch */
    text-align: left;
    line-height: 1.3;
    word-wrap: break-word;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#answers button:hover,
#answers button:focus {
    background: #4fb3d9; /* Color más oscuro en hover */
    color: #000; /* Negro puro para máximo contraste */
    transform: translateY(-1px);
    outline: 2px solid #2193b0;
    outline-offset: 2px;
}

#answers button:active {
    transform: translateY(0);
}

@media (max-width: 480px) {
    #answers button {
        padding: 1.2rem 1rem;
        margin: 0.6rem 0;
        font-size: 0.95rem;
        min-height: 48px;
        color: #fff; /* Blanco puro para máximo contraste */
        font-weight: 500;
    }
}

#score {
  text-align: center;
  margin: 1rem 0;
  font-size: 1.2em;
  font-weight: bold;
  display: block;
  width: 100%;
}

#next-btn {
    background: #6dd5ed;
    color: #222;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 1rem;
    transition: background 0.2s;
}

#next-btn:hover {
    background: #2193b0;
    color: #fff;
}

.footer {
  text-align: center;
  padding: 1em 0;
  color: #fff;
  background: linear-gradient(90deg, #2193b0 0%, #6dd5ed 100%);
  font-size: 0.95em;
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100vw;
  z-index: 100;
  box-shadow: 0 -2px 8px rgba(33,147,176,0.1);
}

#start-form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1em;
  margin-top: 1.5em;
}
#start-form label {
  font-size: 1.1em;
  color: #0f2027; /* Color más oscuro */
  margin-bottom: 0.2em;
  font-weight: 600; /* Peso más fuerte */
}
#start-form input[type="number"] {
  padding: 0.5em 0.8em;
  border: 1.5px solid #2193b0;
  border-radius: 8px;
  font-size: 1.1em;
  width: 80px;
  outline: none;
  transition: border 0.2s;
  box-shadow: 0 2px 8px rgba(33,147,176,0.07);
}
#start-form input[type="number"]:focus {
  border: 1.5px solid #6dd5ed;
}
.styled-btn, #start-form button[type="submit"], #next-btn, #answers button {
  background: linear-gradient(90deg, #2193b0 0%, #6dd5ed 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.7em 2em;
  font-size: 1.1em;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(33,147,176,0.13);
  transition: background 0.2s, transform 0.1s;
  margin-top: 1.2em;
  margin-bottom: 0.5em;
  display: inline-block;
}

.styled-btn:hover, #start-form button[type="submit"]:hover, #next-btn:hover, #answers button:hover {
  background: linear-gradient(90deg, #6dd5ed 0%, #2193b0 100%);
  transform: translateY(-2px) scale(1.04);
}
.motivacion {
  text-align: center;
  font-size: 1.15em;
  color: #1976d2; /* Azul más oscuro para mejor contraste */
  margin: 1.2em 0 0.5em 0;
  font-weight: 600; /* Peso más fuerte */
}
#start-form #error-msg {
  color: #e53935;
  font-size: 1em;
  margin-top: 0.5em;
}
.ranking-nombre {
  margin: 1.2em 0 0.5em 0;
  text-align: center;
}
.ranking-nombre input {
  padding: 0.4em 0.8em;
  border: 1.5px solid #2193b0;
  border-radius: 8px;
  font-size: 1em;
  outline: none;
  margin-right: 0.7em;
}
.ranking-lista {
  background: #f7fafc;
  border-radius: 14px;
  box-shadow: 0 2px 12px rgba(33,147,176,0.10);
  padding: 1.2em 1.5em 1.2em 1.5em;
  margin: 1.5em auto 0 auto;
  max-width: 350px;
  text-align: center;
}
.ranking-lista h3 {
  color: #2193b0;
  margin-bottom: 0.7em;
  font-size: 1.25em;
  letter-spacing: 0.5px;
}
.ranking-lista ol {
  padding-left: 1.2em;
  margin: 0;
  text-align: left;
}
.ranking-lista li {
  background: #e3f0ff;
  border-radius: 7px;
  margin-bottom: 0.5em;
  padding: 0.5em 0.8em;
  font-size: 1.08em;
  font-weight: 500;
  color: #0f2027; /* Color más oscuro para mejor contraste */
  display: flex;
  align-items: center;
  gap: 0.7em;
  box-shadow: 0 1px 4px rgba(33,147,176,0.07);
  transition: background 0.2s;
}
.ranking-lista li:nth-child(1) {
  background: linear-gradient(90deg, #ffd700 0%, #fffbe0 100%);
  color: #b8860b;
  font-weight: bold;
}
.ranking-lista li:nth-child(2) {
  background: linear-gradient(90deg, #c0c0c0 0%, #f7fafc 100%);
  color: #555;
}
.ranking-lista li:nth-child(3) {
  background: linear-gradient(90deg, #cd7f32 0%, #f7fafc 100%);
  color: #7c4a03;
}
.ranking-lista li b {
  min-width: 90px;
  display: inline-block;
}
.quick-select {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.8em;
    margin-bottom: 1.2em;
    margin-top: 0.5em;
    font-size: 1.08em;
    color: #0f2027; /* Color más oscuro */
    font-weight: 500; /* Mejor peso para legibilidad */
}

.quick-select span {
    text-align: center;
    margin-bottom: 0.3em;
    font-weight: 500;
}

.quick-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5em;
    justify-content: center;
    width: 100%;
}

@media (max-width: 480px) {
    .quick-select {
        gap: 0.6em;
        font-size: 1em;
    }
    
    .quick-buttons {
        gap: 0.4em;
    }
}
.quick-btn {
  background: linear-gradient(90deg, #2193b0 0%, #6dd5ed 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.7em 1.5em;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(33,147,176,0.13);
  transition: background 0.2s, transform 0.1s;
  min-width: 60px;
  min-height: 44px;
  flex: 1;
  max-width: 80px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quick-btn:hover,
.quick-btn:focus {
  background: linear-gradient(90deg, #6dd5ed 0%, #2193b0 100%);
  transform: translateY(-2px) scale(1.04);
  outline: 2px solid #2193b0;
  outline-offset: 2px;
}

@media (max-width: 480px) {
    .quick-btn {
        padding: 0.8em 1.2em;
        font-size: 0.95em;
        min-height: 48px;
        max-width: 70px;
    }
}
.level-select {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8em;
  margin-bottom: 1.2em;
  margin-top: 0.5em;
  font-size: 1.08em;
  color: #0f2027; /* Color más oscuro */
  font-weight: 500; /* Mejor peso para legibilidad */
}

.level-select span {
  text-align: center;
  margin-bottom: 0.3em;
  font-weight: 500;
}

.level-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  justify-content: center;
  width: 100%;
}

@media (max-width: 480px) {
    .level-select {
        gap: 0.6em;
        font-size: 1em;
    }
    
    .level-buttons {
        gap: 0.4em;
    }
}
.level-btn {
  background: linear-gradient(90deg, #2193b0 0%, #6dd5ed 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.7em 1.5em;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(33,147,176,0.13);
  transition: background 0.2s, transform 0.1s;
  min-height: 44px;
  flex: 1;
  min-width: 80px;
  max-width: 120px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.level-btn.active, .level-btn:focus {
  background: linear-gradient(90deg, #6dd5ed 0%, #2193b0 100%);
  color: #fff;
  outline: 2px solid #2193b0;
  outline-offset: 2px;
  transform: translateY(-2px) scale(1.04);
}

.level-btn:hover {
  background: linear-gradient(90deg, #6dd5ed 0%, #2193b0 100%);
  transform: translateY(-2px) scale(1.04);
}

@media (max-width: 480px) {
    .level-btn {
        padding: 0.8em 1.2em;
        font-size: 0.9em;
        min-height: 48px;
        min-width: 70px;
        max-width: 100px;
    }
}

/* Mejoras adicionales para dispositivos móviles */

/* Evitar zoom en inputs */
input[type="text"], input[type="number"], input[type="email"], input[type="password"], select, textarea {
    font-size: 16px !important;
}

/* Mejorar el área de toque */
button, input[type="button"], input[type="submit"], .quick-btn, .level-btn {
    -webkit-tap-highlight-color: rgba(33, 147, 176, 0.3);
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Indicador visual para elementos tocables */
.touchable {
    position: relative;
}

.touchable::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: inherit;
    opacity: 0;
    transition: opacity 0.15s ease;
    pointer-events: none;
}

.touchable:active::after {
    opacity: 1;
}

/* Scroll suave */
html {
    scroll-behavior: smooth;
}

/* Mejorar legibilidad en pantallas pequeñas */
@media (max-width: 360px) {
    .container {
        margin: 0 0.3em 4.5em 0.3em;
        padding: 0.8em 0.6em 3.5em 0.6em;
    }
    
    h1 {
        font-size: 1.4em;
        color: #0f2027;
        font-weight: 600;
    }
    
    #question {
        font-size: 1.1em;
        line-height: 1.4;
        color: #0f2027;
        font-weight: 500;
    }
    
    .quick-btn {
        padding: 0.7em 1em;
        font-size: 0.9em;
        min-width: 55px;
        max-width: 65px;
    }
    
    .level-btn {
        padding: 0.7em 1em;
        font-size: 0.85em;
        min-width: 65px;
        max-width: 90px;
    }
}

/* Orientación landscape en móviles */
@media (max-height: 500px) and (orientation: landscape) {
    .header-logo {
        margin-top: 1em;
        margin-bottom: 0.3em;
    }
    
    .header-logo img {
        height: 40px;
    }
    
    h1 {
        font-size: 1.3em;
        margin-bottom: 0.5em;
    }
    
    .container {
        padding: 1em 1.2em 2.5em 1.2em;
        margin-bottom: 3em;
    }
}

/* Animaciones suaves para móviles */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Dark mode support - Mejorado para mejor legibilidad */
@media (prefers-color-scheme: dark) {
    /* Cambiar logo automáticamente en modo oscuro */
    #main-logo {
        content: url('logoblanco.png');
    }
    
    body {
        background: linear-gradient(120deg, #0d1117 0%, #1a1e29 100%);
    }
    
    .container {
        background: #1a1e29;
        color: #f0f6fc; /* Texto más claro para mejor contraste */
        border: 1px solid #30363d; /* Borde sutil */
    }
    
    h1 {
        color: #f0f6fc; /* Blanco más puro */
        text-shadow: 0 1px 2px rgba(0,0,0,0.3); /* Sombra para mejor definición */
    }
    
    #question {
        color: #f0f6fc; /* Texto más claro */
        font-weight: 500;
    }
    
    /* Mejorar botones en modo oscuro */
    #answers button {
        background: #0969da; /* Azul más intenso */
        color: #ffffff;
        border: 1px solid #1f6feb;
    }
    
    #answers button:hover,
    #answers button:focus {
        background: #1f6feb; /* Azul más claro en hover */
        color: #ffffff;
        border: 1px solid #388bfd;
    }
    
    /* Mejorar elementos de selección en modo oscuro */
    .quick-select,
    .level-select {
        color: #f0f6fc;
    }
    
    /* Mejorar ranking en modo oscuro */
    .ranking-lista {
        background: #21262d;
        color: #f0f6fc;
        border: 1px solid #30363d;
    }
    
    .ranking-lista h3 {
        color: #58a6ff; /* Azul más brillante */
    }
    
    .ranking-lista li {
        background: #0d1117;
        color: #f0f6fc;
        border: 1px solid #21262d;
    }
    
    /* Mantener colores especiales del podio en modo oscuro */
    .ranking-lista li:nth-child(1) {
        background: linear-gradient(90deg, #ffd700 0%, #2d2006 100%);
        color: #ffd700;
        border: 1px solid #ffd700;
    }
    
    .ranking-lista li:nth-child(2) {
        background: linear-gradient(90deg, #c0c0c0 0%, #1a1e29 100%);
        color: #c0c0c0;
        border: 1px solid #c0c0c0;
    }
    
    .ranking-lista li:nth-child(3) {
        background: linear-gradient(90deg, #cd7f32 0%, #1a1e29 100%);
        color: #cd7f32;
        border: 1px solid #cd7f32;
    }
    
    /* Mejorar formularios en modo oscuro */
    #start-form label {
        color: #f0f6fc;
    }
    
    #start-form input[type="number"],
    .ranking-nombre input {
        background: #21262d;
        color: #f0f6fc;
        border: 1px solid #30363d;
    }
    
    #start-form input[type="number"]:focus,
    .ranking-nombre input:focus {
        border: 1px solid #58a6ff;
        box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.3);
    }
    
    /* Mejorar texto motivacional en modo oscuro */
    .motivacion {
        color: #58a6ff;
    }
    
    /* Mejorar errores en modo oscuro */
    #start-form #error-msg {
        color: #ff7b72; /* Rojo más suave pero visible */
    }
}

/* Estilos específicos para dispositivos móviles */
.mobile-device {
    -webkit-overflow-scrolling: touch;
}

.mobile-device .container {
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.mobile-device button {
    -webkit-appearance: none;
    appearance: none;
}

.mobile-device #answers button {
    position: relative;
    overflow: hidden;
}

.mobile-device #answers button.answered {
    animation: pulse 0.3s ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Loading states */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #2193b0;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Centrar botón "Jugar de nuevo" al final del juego */
.restart-btn {
    display: block !important;
    margin: 1.5rem auto 0 auto !important;
    text-align: center;
}

@media (max-width: 480px) {
    .restart-btn {
        margin: 1.2rem auto 0 auto !important;
    }
}

/* --- Botón flotante de feedback --- */
#feedback-btn {
  position: fixed;
  bottom: 4.5em;
  right: 1.3em;
  z-index: 1200;
  background: linear-gradient(90deg, #2193b0 0%, #6dd5ed 100%);
  color: #fff;
  border: none;
  border-radius: 2em;
  padding: 0.7em 1.5em 0.7em 2.2em;
  font-size: 1em;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(33,147,176,0.13);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5em;
  opacity: 0.85;
  transition: opacity 0.2s, background 0.2s, transform 0.1s;
}
#feedback-btn:hover {
  opacity: 1;
  background: linear-gradient(90deg, #6dd5ed 0%, #2193b0 100%);
  transform: scale(1.04);
}
@media (max-width: 480px) {
  #feedback-btn {
    font-size: 0.95em;
    padding: 0.7em 1.1em 0.7em 1.7em;
    right: 0.7em;
    bottom: 4em;
  }
}

/* --- Modal de feedback --- */
.feedback-modal {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  z-index: 2000;
  left: 0; top: 0; width: 100vw; height: 100vh;
  background: rgba(33, 60, 78, 0.18);
  backdrop-filter: blur(2px);
}
.feedback-modal-content {
  background: #fff;
  color: #1a3c4e;
  border-radius: 14px;
  padding: 2em 1.5em 1.5em 1.5em;
  box-shadow: 0 4px 24px rgba(33,147,176,0.13);
  max-width: 350px;
  width: 92vw;
  position: relative;
  animation: feedbackFadeIn 0.2s;
}
@keyframes feedbackFadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.feedback-close {
  position: absolute;
  top: 0.7em;
  right: 1em;
  font-size: 1.5em;
  color: #2193b0;
  cursor: pointer;
  font-weight: bold;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.feedback-close:hover {
  opacity: 1;
}
.feedback-modal-content h2 {
  font-size: 1.15em;
  margin-bottom: 1em;
  color: #2193b0;
  text-align: center;
}
#feedback-form label {
  font-size: 1em;
  color: #1a3c4e;
  margin-bottom: 0.3em;
  display: block;
}
#feedback-msg {
  width: 100%;
  border-radius: 8px;
  border: 1.5px solid #2193b0;
  padding: 0.7em;
  font-size: 1em;
  margin-bottom: 1em;
  resize: vertical;
  min-height: 60px;
  max-height: 180px;
}
#feedback-form button[type="submit"] {
  background: linear-gradient(90deg, #2193b0 0%, #6dd5ed 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.7em 2em;
  font-size: 1.1em;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(33,147,176,0.13);
  transition: background 0.2s, transform 0.1s;
  margin-top: 0.5em;
  margin-bottom: 0.5em;
  display: block;
  width: 100%;
}
#feedback-form button[type="submit"]:hover {
  background: linear-gradient(90deg, #6dd5ed 0%, #2193b0 100%);
  transform: scale(1.03);
}
.feedback-info {
  font-size: 0.92em;
  color: #2193b0;
  margin-top: 0.5em;
  text-align: center;
}
@media (prefers-color-scheme: dark) {
  .feedback-modal-content {
    background: #1a1e29;
    color: #f0f6fc;
    box-shadow: 0 4px 24px rgba(33,147,176,0.25);
  }
  #feedback-form label {
    color: #f0f6fc;
  }
  #feedback-msg {
    background: #21262d;
    color: #f0f6fc;
    border: 1.5px solid #58a6ff;
  }
  .feedback-close {
    color: #58a6ff;
  }
  .feedback-info {
    color: #58a6ff;
  }
}