/* ============================================================================
   layout.css — header, navegación, mega-menú, footer y estructura
   ========================================================================== */

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute; left: 1rem; top: -120%; z-index: 1000;
  background: var(--su-cyan); color: var(--su-black);
  padding: 0.6rem 1rem; border-radius: 8px; font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  transition: background var(--t) var(--ease), border-color var(--t), backdrop-filter var(--t);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(2, 7, 13, 0.72);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom-color: var(--su-border);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; width: 100%;
}
.brand { display: inline-flex; align-items: center; gap: 0.7rem; flex-shrink: 0; }
.brand img { height: 34px; width: auto; }
.brand .brand-by { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.12em; color: var(--su-text-dim); text-transform: uppercase; }

/* ---------- Nav ---------- */
.primary-nav { display: flex; align-items: center; gap: 0.35rem; }
/* CTA dentro del nav: solo visible en el panel móvil */
.primary-nav > .btn { display: none; }
.nav-link {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.55rem 0.85rem; border-radius: 10px;
  font-size: var(--step--1); font-weight: 500; color: var(--su-text);
  transition: color var(--t-fast), background var(--t-fast);
}
.nav-link:hover, .nav-link[aria-expanded="true"] { color: var(--su-text-strong); background: var(--su-surface-2); }
.nav-link .chev { width: 14px; height: 14px; transition: transform var(--t-fast); opacity: 0.7; }
.nav-link[aria-expanded="true"] .chev { transform: rotate(180deg); }

.has-mega { position: relative; }

/* ---------- Mega menú ---------- */
.mega {
  position: absolute; top: calc(100% + 14px); left: 50%; transform: translateX(-50%) translateY(8px);
  width: min(760px, 92vw);
  background: rgba(6, 14, 22, 0.96);
  border: 1px solid var(--su-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(20px);
  padding: 1.4rem;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease), visibility var(--t);
}
.has-mega.open .mega { opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0); }
.mega-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.4rem; }
.mega-item { padding: 0.7rem 0.85rem; border-radius: 12px; transition: background var(--t-fast); display: block; }
.mega-item:hover { background: var(--su-surface-2); }
.mega-item strong { display: block; color: var(--su-text-strong); font-size: 0.92rem; font-weight: 600; }
.mega-item span { font-size: 0.78rem; color: var(--su-text-dim); }
.mega-foot { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--su-border); display: flex; justify-content: space-between; align-items: center; }

/* ---------- Acciones header ---------- */
.header-actions { display: flex; align-items: center; gap: 0.6rem; }

/* ---------- Toggle móvil ---------- */
.nav-toggle { display: none; width: 44px; height: 44px; border-radius: 10px; border: 1px solid var(--su-border); align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 20px; height: 2px; background: var(--su-soft-white); border-radius: 2px; transition: transform var(--t), opacity var(--t);
}
.nav-toggle span { position: relative; }
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }
body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { transform: translateY(6px) rotate(45deg); }
body.nav-open .nav-toggle span::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  border-top: 1px solid var(--su-border);
  background: linear-gradient(180deg, transparent, rgba(0, 17, 31, 0.5));
  padding-block: clamp(3rem, 2rem + 4vw, 5rem) 2rem;
  margin-top: 2rem;
}
.footer-top { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 2.5rem; }
.footer-brand img { height: 38px; margin-bottom: 1.1rem; }
.footer-brand p { color: var(--su-text-dim); font-size: var(--step--1); max-width: 34ch; }
.footer-col h4 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--su-cyan); margin-bottom: 1rem; }
.footer-col a { display: block; padding: 0.3rem 0; color: var(--su-text-dim); font-size: 0.9rem; transition: color var(--t-fast); }
.footer-col a:hover { color: var(--su-text-strong); }
.footer-bottom {
  margin-top: 3rem; padding-top: 1.6rem; border-top: 1px solid var(--su-border);
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center;
  font-size: 0.8rem; color: var(--su-text-dim);
}
.footer-bottom a:hover { color: var(--su-text-strong); }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: fixed; inset: var(--header-h) 0 0 0; z-index: 90;
    flex-direction: column; align-items: stretch; gap: 0.2rem;
    padding: 1.5rem var(--gutter) 3rem;
    background: rgba(2, 7, 13, 0.98); backdrop-filter: blur(18px);
    overflow-y: auto;
    transform: translateX(100%); transition: transform var(--t) var(--ease);
  }
  body.nav-open .primary-nav { transform: translateX(0); }
  .nav-link { padding: 0.9rem 0.5rem; font-size: 1.05rem; border-bottom: 1px solid var(--su-border); border-radius: 0; }
  .primary-nav > .btn { display: inline-flex; }
  .mega {
    position: static; transform: none; width: 100%; opacity: 1; visibility: visible; pointer-events: auto;
    box-shadow: none; border: 0; background: transparent; padding: 0.4rem 0 0.8rem 0.6rem;
    max-height: 0; overflow: hidden; transition: max-height var(--t) var(--ease);
  }
  .has-mega.open .mega { max-height: 800px; }
  .mega-grid { grid-template-columns: 1fr; }
  .mega-foot { display: none; }
  .header-actions .btn-ghost { display: none; }
}
@media (max-width: 720px) {
  .footer-top { grid-template-columns: 1fr 1fr; gap: 1.8rem; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 460px) {
  .footer-top { grid-template-columns: 1fr; }
}