:root {
  color-scheme: dark;
  --bg: #0b1020;
  --bg-card: #121935;
  --text: #f2f5ff;
  --muted: #aeb8d8;
  --accent: #8c9eff;
  --accent-2: #00e0b8;
  --border: #25305a;
  --max-width: 1040px;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #18224a 0%, var(--bg) 45%);
  color: var(--text);
  line-height: 1.5;
}

.hero {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(130deg, rgba(140, 158, 255, 0.2), rgba(0, 224, 184, 0.08));
}

/* Contenedor: título a la izquierda, idioma a la derecha (misma franja que el hero) */
.hero__shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.25rem 1.6rem;
}

.hero__content {
  margin: 0;
  padding: 0;
  min-width: 0;
}

/* Idioma: columna derecha alineada al borde derecho del área de contenido */
.hub-language-bar {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.4rem;
  text-align: right;
}

.hub-language-bar__caption {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.hub-language-bar__flags {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hub-flag-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(14, 21, 48, 0.85);
  cursor: pointer;
  line-height: 0;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.12s ease;
}

.hub-flag-btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.hub-flag-btn:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}

.hub-flag-btn--active {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 1px rgba(0, 224, 184, 0.35);
}

.hub-flag {
  display: block;
  width: 36px;
  height: 24px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 767px) {
  .hero__shell {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-top: 1.35rem;
  }

  .hub-language-bar {
    align-self: flex-end;
    order: -1;
  }
}

@media (min-width: 768px) {
  .hero__shell {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem 3rem;
    padding-top: 2.2rem;
    padding-bottom: 1.6rem;
  }

  .hero__content {
    flex: 1;
  }

  .hub-language-bar {
    flex-shrink: 0;
    align-self: flex-start;
    /* Alineado visualmente con la badge + título */
    margin-top: 0.1rem;
  }

  .hub-flag {
    width: 40px;
    height: 27px;
  }
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-2);
  margin-bottom: 0.55rem;
}

h1 {
  margin: 0;
  font-size: clamp(1.85rem, 4vw, 2.45rem);
}

.subtitle {
  color: var(--muted);
  margin: 0.65rem 0 1.1rem;
  max-width: 68ch;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.15rem;
}

.course-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.course-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.05rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.course-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.course-card__label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  margin-bottom: 0.35rem;
}

.course-card h2 {
  margin: 0 0 0.45rem;
  font-size: 1.25rem;
}

.course-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.course-card__cta {
  margin-top: 0.75rem;
  color: var(--accent);
  font-weight: 600;
}

.hub-session-bar {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.45rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  font-size: 0.86rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.hub-session-bar[hidden] {
  display: none !important;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 1.1rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer a {
  color: var(--accent-2);
  font-weight: 600;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}