:root {
  --bg: #0b0f14;
  --panel: #0f1620;
  --text: #e6eaf0;
  --muted: #a7b1c2;
  --accent: #0A3A66;
  --accent-2: #125a9c;
  --card: #121a25;
  --border: #1c2633;
  --focus: #9dd1ff;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center; /* centra verticalmente brand y controles */
  justify-content: space-between;
  height: 56px;
}
.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.menu {
  display: flex;
  gap: 14px;
}

/* Botón hamburguesa oculto en escritorio */
.menu-toggle {
  display: none;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.menu-toggle:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.menu-link {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 8px;
  transition: color .2s ease, background .2s ease;
}
.menu-link:hover,
.menu-link:focus-visible {
  color: var(--text);
  background: var(--panel);
  outline: none;
}

.site-main { padding: 28px 0 64px; }
.hero { padding: 28px 0 6px; }
.hero h1 { margin: 0 0 10px; font-size: 28px; }
.hero p { margin: 0; color: var(--muted); }

.block { margin-top: 28px; }
.block h2 {
  margin: 0 0 12px;
  font-size: 18px;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: .3px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 10px;
}
@media (min-width: 560px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 900px) {
  .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* Reducir espacio del hero en versión web */
@media (min-width: 560px) {
  .site-main { padding-top: 16px; }
  .hero { padding-top: 12px; }
}
@media (min-width: 900px) {
  .site-main { padding-top: 8px; }
  .hero { padding-top: 8px; }
}

.card {
  display: flex;
  align-items: center;
  min-height: 64px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  transition: transform .08s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover,
.card:focus-visible {
  transform: translateY(-1px);
  background: linear-gradient(180deg, color-mix(in oklab, var(--card) 88%, white 12%), var(--card));
  border-color: color-mix(in oklab, var(--border) 60%, var(--accent) 40%);
  box-shadow: 0 6px 20px rgba(10, 58, 102, .18);
  outline: none;
}
.card span { pointer-events: none; }

/* Estilos para cursos no disponibles */
.card--unavailable {
  background: #2a2a2a !important;
  border-color: #404040 !important;
  color: #888 !important;
  cursor: not-allowed;
  opacity: 0.7;
}

.card--unavailable:hover,
.card--unavailable:focus-visible {
  transform: none !important;
  background: #2a2a2a !important;
  border-color: #404040 !important;
  box-shadow: none !important;
  cursor: not-allowed;
}

.card--unavailable span {
  color: #888 !important;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 18px 0 36px;
  background: var(--panel);
  margin-top: 28px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}
.social {
  display: flex;
  gap: 14px;
}
.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--border);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  text-decoration: none;
  transition: color .2s ease, background .2s ease, border-color .2s ease, transform .08s ease;
}
.icon-link:hover,
.icon-link:focus-visible {
  color: var(--focus);
  border-color: color-mix(in oklab, var(--border) 40%, var(--accent-2) 60%);
  transform: translateY(-1px);
  outline: none;
}

/* Accesibilidad */
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* Ajustes móviles: más margen lateral y compensación del menú */
@media (max-width: 420px) {
  .container { padding: 0 24px; }
  .header-inner { height: auto; padding: 8px 0; gap: 8px; position: relative; }
  .brand { margin-left: 12px; }
  .menu-toggle { display: inline-flex; }
  .menu {
    width: 100%;
    margin-left: 0; margin-right: 0;
  }
  /* Menú colapsado por defecto */
  .menu { display: none; }
  .menu.open { 
    display: flex; 
    position: absolute; 
    left: 0; 
    right: 0; 
    top: calc(100% + 8px); 
    z-index: 20;
    flex-direction: column; 
    gap: 8px; 
    background: var(--panel); 
    padding: 10px; 
    border: 1px solid var(--border); 
    border-radius: 12px; 
  }
  .menu-link { white-space: nowrap; }
}