/* ==========================================================================
   1. Variables y Estilos Base
   ========================================================================== */
:root {
  --color-primary: #122E5D;
  --color-secondary: #FD5902;
  --color-text: #333;
  --color-light: #fff;
  --color-background: #f5f5f5;
  --color-border: #ccc;
  --font-main: "Quicksand", sans-serif;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

/* ==========================================================================
   2. Header y Navegación
   ========================================================================== */
header {
  background-color: var(--color-primary);
  color: var(--color-light);
  padding: 1.25rem 1.5rem;
  text-align: center;
  box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
}

header .logo {
  width: 6.25rem; /* 100px */
  height: auto;
  margin: 0 auto 0.625rem;
}

header h1 {
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  letter-spacing: 0.125rem;
  margin: 0;
}

header h2 {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 400;
  margin: 0;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

nav ul li a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  background: var(--color-primary);
  color: var(--color-light);
  border-radius: 0.3125rem;
  font-weight: bold;
  text-decoration: none;
  text-transform: uppercase;
  transition: background 0.3s ease;
}

nav ul li a:hover {
  background: var(--color-secondary);
}

/* ==========================================================================
   3. Contenido Principal: Actividades
   ========================================================================== */
#actividades {
  padding: 2.5rem 1.5rem;
  background-color: var(--color-light);
  border-radius: 0.625rem;
  box-shadow: 0 0 0.625rem rgba(0, 0, 0, 0.1);
  max-width: 76.25rem; /* 1220px */
  margin: 2.5rem auto;
  animation: fadeIn 1s ease-out;
}

.titulo-actividades {
  font-size: clamp(1.8rem, 4vw, 2.2rem);
  color: var(--color-primary);
  font-weight: bold;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-secondary);
  display: table; 
  margin-left: auto; 
  margin-right: auto; 
  margin-bottom: 2rem; 
}

/* Grid Inteligente de Actividades */
.actividades-grid {
  margin-top:2rem;
  display:  grid;
  grid-template-columns: repeat(auto-fit, minmax(15.625rem, 1fr)); /* 250px */
  gap: 1.5rem; /* 24px */
  justify-items: center; /* Centra las tarjetas en el grid */
}

/* Flip Cards */
.flip-card-actividad {
  width: 100%;
  aspect-ratio: 16 / 10; /* Mantiene una forma consistente, más robusto que height fijo */
  perspective: 1000px;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.flip-card-actividad:hover {
    transform: translateY(-5px); /* Efecto de levantar la tarjeta */
}

.flip-card-inner-actividad {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
}

.flip-card-actividad:hover .flip-card-inner-actividad {
  transform: rotateY(180deg);
}

.flip-card-front-actividad,
.flip-card-back-actividad {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.2);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.flip-card-front-actividad {
  background-color: #f9f9f9;
  color: var(--color-primary);
  font-size: 1.25rem;
  font-weight: bold;
}

.flip-card-back-actividad {
  background-color: var(--color-secondary);
  color: var(--color-light);
  transform: rotateY(180deg);
  font-size: 1.1rem;
  line-height: 1.4;
}

.flip-card-back-actividad h3 {
  margin-top: 0;
  font-size: 1.25rem;
  font-weight: bold;
}

/* ==========================================================================
   4. Footer
   ========================================================================== */
footer {
  text-align: center;
  padding: 1.25rem;
  background: var(--color-primary);
  color: var(--color-light);
  font-size: 1rem;
  margin-top: 2.5rem;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}