/* =========================
   VARIABLES GLOBALES
========================= */
:root {
  --color-primary: #0EA5E9;
  --color-primary-dark: #0284C7;

  --color-background: #F8FAFC;       /* Más claro */
  --color-surface: #FFFFFF;

  --color-text: #1E293B;             /* Gris elegante, no negro */
  --color-muted: #94A3B8;            /* Más suave */

  --color-border: #EEF2F7;           /* Borde más fino visualmente */

  --shadow-soft:
    0 4px 12px rgba(15, 23, 42, .04),
    0 10px 24px rgba(15, 23, 42, .03);

  --radius: 18px;
}

/* =========================
   RESET BASE
========================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Focus accesible */
:focus-visible {
  outline: 3px solid rgba(14,165,233,.35);
  outline-offset: 3px;
  border-radius: 10px;
}

/* =========================
   HEADER
========================= */
header {
  text-align: center;
  padding: 3rem 1.5rem 2.5rem;
  background: #FFFFFF;  /* Eliminado degradado oscuro */
  border-bottom: 1px solid var(--color-border);
}

header h1 {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.5px;
}

/* =========================
   INTRO
========================= */
.intro {
  max-width: 720px;
  margin: 2.5rem auto 3.5rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 1rem;
}

/* =========================
   MENU GRID
========================= */
.menu {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.4rem;
  padding: 0 1.5rem 4rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* =========================
   TARJETAS
========================= */
.menu a {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;

  background-color: var(--color-surface);
  padding: 2.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);

  text-decoration: none;
  color: var(--color-text);

  box-shadow: var(--shadow-soft);

  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
}

.menu a:hover {
  border-color: #DCEAF5;
  transform: translateY(-4px);
  box-shadow:
    0 12px 28px rgba(14,165,233,.08);
}

.menu a:active {
  transform: translateY(-2px);
}

/* =========================
   TITULO TARJETA
========================= */
.menu a h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* =========================
   DESCRIPCIÓN
========================= */
.menu a p {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: 1.7rem;

  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* =========================
   CTA INFERIOR
========================= */
.menu a::after {
  content: "Ingresar →";
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);

  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.menu a:hover::after {
  opacity: 1;
  transform: translateY(0);
}

/* =========================
   FOOTER
========================= */
footer {
  text-align: center;
  padding: 2.8rem 1.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  background-color: #FFFFFF;
}

/* =========================
   LANGUAGE SWITCHER
========================= */
.language-switcher {
  text-align: right;
  font-size: 0.85rem;
  margin-bottom: 1.2rem;
  padding: 0 1.5rem;
}

.language-switcher a {
  color: var(--color-muted);
  text-decoration: none;
  margin-left: 0.6rem;
  transition: color 0.2s ease;
}

.language-switcher a:hover,
.language-switcher a.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* =========================
   MOTION SAFETY
========================= */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 600px) {
  header h1 {
    font-size: 1.7rem;
  }

  .menu {
    gap: 1.6rem;
  }
}