/* ==========================================================================
   MIDAP — Header, Nav, Footer
   ========================================================================== */

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--dur-base) var(--ease), height var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}
.site-header.is-scrolled {
  height: 64px;
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}
.logo:hover { color: var(--color-text); }
.logo-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--color-primary);
  display: inline-block;
}

.main-nav { display: flex; align-items: center; gap: var(--space-6); }
.main-nav > ul { display: flex; align-items: center; gap: var(--space-6); }
.main-nav a.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: var(--space-2) 0;
  position: relative;
}
.main-nav a.nav-link.active,
.main-nav a.nav-link:hover { color: var(--color-primary-darker); }

.nav-item--has-menu { position: relative; }
.nav-item--has-menu > a::after {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-left: 6px;
  transition: transform var(--dur-fast) var(--ease);
}
.nav-item--has-menu:hover > a::after { transform: rotate(225deg); }

.mega-menu {
  position: absolute;
  top: calc(100% + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: 620px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2) var(--space-5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility var(--dur-fast);
}
.nav-item--has-menu:hover .mega-menu,
.nav-item--has-menu:focus-within .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.mega-menu a {
  display: block;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}
.mega-menu a:hover { background: var(--color-primary-lighter); }
.mega-menu a strong { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 2px; }
.mega-menu a span { display: block; font-size: 0.8rem; color: var(--color-text-faint); }

.header-actions { display: flex; align-items: center; gap: var(--space-5); }
.header-actions .login-link { font-weight: 500; font-size: 0.9375rem; color: var(--color-text); }

.nav-toggle { display: none; }

/* ---------- Mobile nav ---------- */
@media (max-width: 991px) {
  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--space-5);
    transform: translateX(100%);
    transition: transform var(--dur-base) var(--ease);
    overflow-y: auto;
  }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav > ul { flex-direction: column; align-items: stretch; gap: 0; }
  .main-nav a.nav-link { padding: var(--space-4) 0; border-bottom: 1px solid var(--color-border); }
  .mega-menu {
    position: static;
    transform: none;
    width: auto;
    box-shadow: none;
    border: none;
    display: none;
    grid-template-columns: 1fr;
    opacity: 1; visibility: visible;
    padding: 0 0 var(--space-3);
  }
  .nav-item--has-menu.is-open .mega-menu { display: grid; }
  .header-actions { margin-top: auto; padding-top: var(--space-6); flex-direction: column; align-items: stretch; }
  .header-actions .btn { width: 100%; }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px; height: 40px;
    background: none; border: none; cursor: pointer;
  }
  .nav-toggle span { display: block; height: 2px; width: 100%; background: var(--color-text); border-radius: 2px; transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease); }
  .nav-toggle.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.is-active span:nth-child(2) { opacity: 0; }
  .nav-toggle.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}
@media (min-width: 992px) {
  .header-actions .login-link { display: inline-block; }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-surface-dark);
  color: rgba(255,255,255,0.72);
  padding: var(--space-9) 0 var(--space-5);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-7);
  padding-bottom: var(--space-8);
}
.footer-brand .logo { color: var(--color-text-invert); }
.footer-brand p { margin-top: var(--space-4); font-size: 0.9rem; max-width: 280px; }
.footer-col h4 { color: var(--color-text-invert); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: var(--space-4); }
.footer-col li { margin-bottom: var(--space-3); }
.footer-col a { color: rgba(255,255,255,0.7); font-size: 0.9rem; }
.footer-col a:hover { color: var(--color-primary); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border-dark);
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--color-primary); }
.footer-legal { display: flex; gap: var(--space-5); }

@media (max-width: 900px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}