/* Variables globales de diseño y accesibilidad */
:root {
  --bg-color: #f4f5f7;
  --text-main: #1a1a1a;
  --text-muted: #555555;
  --focus-color: #005fcc;
  --card-bg: #ffffff;
  --tag-bg: #e0f7fa;
  --tag-text: #004d40;
}

/* Reset básico de elementos */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
}

/* Foco visible accesible por teclado (Criterio WCAG 2.4.7) */
:focus-visible {
  outline: 3px solid var(--focus-color);
  outline-offset: 3px;
}

/* Clase para ocultar elementos visualmente manteniendo la lectura para lectores de pantalla */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Estilos del Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 5%;
  background: var(--card-bg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
}

.btn-primary {
  background-color: #25D366; /* Color corporativo de WhatsApp */
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
  transition: background-color 0.2s ease;
}

.btn-primary:hover {
  background-color: #1ebc5a;
}

/* Contenedor principal y Grilla de 3 columnas */
.main-content {
  padding: 4rem 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.grid-mvp {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 2.5rem;
}

/* Diseño responsivo para pantallas medianas y grandes: exacto 3 columnas */
@media (min-width: 768px) {
  .grid-mvp {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-mvp {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Estilos de las Tarjetas MVP inspiradas en la referencia visual */
.card {
  background: var(--card-bg);
  border-radius: 20px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.card-header {
  height: 160px;
  position: relative;
}

.icon-bookmark {
  position: absolute;
  top: 15px;
  right: 15px;
  width: 32px;
  height: 32px;
  background: white;
  border-radius: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0.9;
}

.icon-bookmark::after {
  content: '🔖';
  font-size: 16px;
}

/* Gradientes individuales y únicos para cada uno de los 8 productos */
.bg-1 { background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 99%, #fecfef 100%); }
.bg-2 { background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%); }
.bg-3 { background: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%); }
.bg-4 { background: linear-gradient(135deg, #fccb90 0%, #d57eeb 100%); }
.bg-5 { background: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%); }
.bg-6 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.bg-7 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.bg-8 { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.card-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.card-tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Sección Footer / Llamado a la Acción final */
.cta-section {
  background: var(--card-bg);
  text-align: center;
  padding: 5rem 2rem;
  border-top: 1px solid #eaeaea;
}

.cta-section h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.cta-description {
  margin-bottom: 2rem;
  color: var(--text-muted);
}