/* ============================================================================
   base.css  —  Reset, tipografía base, contenedores y utilidades (común)
   Mobile-first. Breakpoints: 390 (base), 768 (tablet), 1024/1366 (desktop).
   ============================================================================ */
@import url('https://fonts.googleapis.com/css2?family=Raleway:wght@400;500;600;700&family=Roboto+Slab:wght@400;500;700&display=swap');

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-texto);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--texto);
  background: var(--bg);
  overflow-x: hidden;
}

body.hidescroll, body.nav-open { overflow: hidden; }

h1, h2, h3, h4 { font-family: var(--font-titulo); line-height: 1.2; color: var(--azul-marino); margin: 0 0 var(--sp-3); }
h1 { font-size: clamp(1.9rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 var(--sp-3); }

a { color: var(--azul-secundario); text-decoration: none; transition: color var(--t); }
a:hover { color: var(--acento); }

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

:focus-visible { outline: 3px solid var(--acento); outline-offset: 2px; border-radius: 3px; }

/* ---------- Contenedores ---------- */
.contenedor { width: 100%; max-width: var(--ancho-max); margin: 0 auto; padding: 0 var(--sp-4); }
.contenedor-wide { width: 100%; max-width: var(--ancho-wide); margin: 0 auto; padding: 0 var(--sp-4); }

/* ---------- Secciones ---------- */
.seccion { padding: var(--sp-8) 0; }
.seccion--alt { background: var(--bg-alt); }
.seccion--oscura { background: var(--bg-oscuro); color: var(--texto-inverso); }
.seccion--oscura h2, .seccion--oscura h3 { color: var(--texto-inverso); }

.seccion-titulo { text-align: center; margin-bottom: var(--sp-2); }
.seccion-intro { text-align: center; color: var(--texto-suave); max-width: 680px; margin: 0 auto var(--sp-6); }
.seccion--oscura .seccion-intro { color: rgba(255,255,255,.85); }

/* línea/acento decorativo bajo títulos */
.seccion-titulo::after {
  content: ""; display: block; width: 64px; height: 4px; margin: var(--sp-3) auto 0;
  background: var(--acento); border-radius: var(--radio-full);
}

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  font-family: var(--font-texto); font-weight: 600; font-size: 0.98rem;
  border-radius: var(--radio-full); border: 2px solid transparent; cursor: pointer;
  transition: transform var(--t), background var(--t), color var(--t), box-shadow var(--t);
  text-align: center;
}
.btn:hover { transform: translateY(-2px); }
.btn--primario { background: var(--acento); color: var(--acento-texto); }
.btn--primario:hover { background: var(--acento-hover); color: var(--acento-texto); box-shadow: var(--sombra-md); }
.btn--secundario { background: transparent; color: var(--texto-inverso); border-color: rgba(255,255,255,.7); }
.btn--secundario:hover { background: rgba(255,255,255,.14); color: var(--texto-inverso); }
.btn--azul { background: var(--azul-secundario); color: #fff; }
.btn--azul:hover { background: var(--azul-marino); color: #fff; box-shadow: var(--sombra-md); }
.btn--claro { background: #fff; color: var(--azul-marino); }
.btn--claro:hover { background: var(--azul-tinte); color: var(--azul-marino); }

/* ---------- Utilidades ---------- */
.text-center { text-align: center; }
.mt-6 { margin-top: var(--sp-6); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* skip-link accesible */
.skip-link {
  position: absolute; left: var(--sp-3); top: -60px; z-index: 2000;
  background: var(--acento); color: #fff; padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radio-sm); transition: top var(--t);
}
.skip-link:focus { top: var(--sp-3); color: #fff; }

/* ---------- HERRAMIENTA DE REVISIÓN: botón flotante "Vista previa" ---------- */
/* (NO es parte del sitio; aspecto deliberadamente de overlay/herramienta) */
.preview-fab {
  position: fixed; left: 14px; bottom: 18px; z-index: 1200;
  display: inline-flex; align-items: center; gap: 7px;
  background: #11151f; color: #fff; border: 1.5px dashed #ffd34d;
  padding: 9px 14px; border-radius: var(--radio-full); cursor: pointer;
  font-family: var(--font-texto); font-weight: 700; font-size: .82rem; box-shadow: var(--sombra-lg);
}
.preview-fab:hover { background: #1c2233; }
.preview-fab__ico { font-size: 1rem; color: #ffd34d; }

.preview-panel {
  position: fixed; left: 14px; bottom: 64px; z-index: 1200;
  width: min(94vw, 340px); max-height: 76vh; overflow-y: auto;
  background: #11151f; color: #fff; border: 1.5px solid #2a3147; border-radius: var(--radio-lg);
  box-shadow: var(--sombra-lg); padding: var(--sp-4);
  opacity: 0; transform: translateY(12px) scale(.97); pointer-events: none; transition: all var(--t);
}
.preview-panel.is-open { opacity: 1; transform: none; pointer-events: auto; }
.preview-panel__head { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--sp-3); border-bottom: 1px solid #2a3147; padding-bottom: var(--sp-3); margin-bottom: var(--sp-3); }
.preview-panel__head strong { display: block; color: #ffd34d; font-family: var(--font-titulo); }
.preview-panel__head span { display: block; font-size: .72rem; color: rgba(255,255,255,.55); }
.preview-close { background: none; border: 0; color: rgba(255,255,255,.7); font-size: 1.5rem; line-height: 1; cursor: pointer; }
.preview-close:hover { color: #fff; }
.preview-sec { margin-bottom: var(--sp-4); }
.preview-cap { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .5px; color: rgba(255,255,255,.5); margin-bottom: 7px; }
.preview-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.preview-chip { padding: 5px 11px; border-radius: var(--radio-full); background: #1c2233; color: rgba(255,255,255,.85); font-size: .78rem; font-weight: 600; }
.preview-chip:hover { background: #2a3147; color: #fff; }
.preview-chip.is-current { background: #ffd34d; color: #11151f; }
.preview-links { display: flex; flex-wrap: wrap; gap: 5px; }
.preview-link { padding: 5px 10px; border-radius: var(--radio-sm); background: #1c2233; color: rgba(255,255,255,.82); font-size: .78rem; }
.preview-link:hover { background: #2a3147; color: #fff; }
.preview-link.is-current { background: #fff; color: #11151f; font-weight: 700; }
.preview-compare { display: block; text-align: center; background: var(--acento); color: var(--acento-texto); font-weight: 700; padding: 9px; border-radius: var(--radio-sm); }
.preview-compare:hover { filter: brightness(1.08); color: var(--acento-texto); }
@media print { .preview-fab, .preview-panel { display: none !important; } }

/* ---------- Breakpoints helpers ---------- */
@media (min-width: 768px) {
  .seccion { padding: var(--sp-9) 0; }
}