/* ============================================================================
   NAVIGATION - Sticky glass header, mobile drawer, footer
   ============================================================================ */

/* ===========================================================================
   TOP NAVIGATION BAR
   ============================================================================ */

.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(7, 9, 13, 0.6);
  /* The one backdrop-filter on the site. Kept modest: it re-blurs the strip
     beneath the header on every scrolled frame. */
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: background var(--duration-slow) var(--ease), border-color var(--duration-slow) var(--ease);
}

.top-nav--scrolled {
  background: rgba(7, 9, 13, 0.82);
  border-bottom-color: var(--border);
}

.top-nav__inner {
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .top-nav__inner {
    padding: 0 var(--space-8);
  }
}

.top-nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
}

/* Slim mark on mobile, wide wordmark on larger screens */
.top-nav__logo-wide {
  display: none;
  height: 26px;
  width: auto;
}

.top-nav__logo-slim {
  display: block;
  height: 34px;
  width: auto;
}

@media (min-width: 640px) {
  .top-nav__logo-wide { display: block; }
  .top-nav__logo-slim { display: none; }
}

.top-nav__links {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

.top-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-muted);
  transition: color var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease);
}

.top-nav__link:hover {
  color: var(--text-strong);
  background: rgba(255, 255, 255, 0.05);
}

.top-nav__link--active {
  color: var(--text-strong);
}

.top-nav__link--active::after {
  content: "";
  position: absolute;
  left: var(--space-4);
  right: var(--space-4);
  bottom: 6px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.top-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.top-nav__cta {
  display: none;
}

@media (min-width: 480px) {
  .top-nav__cta { display: inline-flex; }
}

/* Hamburger (mobile only) */
.top-nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 11px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease);
}

.top-nav__hamburger:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-strong);
}

.top-nav__hamburger-bar {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--text-strong);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease), opacity var(--duration-base) var(--ease);
}

.top-nav__hamburger[aria-expanded="true"] .top-nav__hamburger-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.top-nav__hamburger[aria-expanded="true"] .top-nav__hamburger-bar:nth-child(2) {
  opacity: 0;
}

.top-nav__hamburger[aria-expanded="true"] .top-nav__hamburger-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (min-width: 900px) {
  .top-nav__links { display: flex; }
  .top-nav__hamburger { display: none; }
}

/* ===========================================================================
   MOBILE DRAWER
   ============================================================================ */

.drawer-overlay {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(5, 7, 10, 0.6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-slow) var(--ease);
}

.drawer-overlay--open {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  height: 100vh;
  height: 100dvh;
  z-index: 200;
  width: min(360px, 88vw);
  display: flex;
  flex-direction: column;
  background: var(--ink-850);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  transform: translateX(104%);
  transition: transform var(--duration-slow) var(--ease-out);
  overflow-y: auto;
}

.drawer--open {
  transform: translateX(0);
}

.drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 var(--space-5);
  border-bottom: 1px solid var(--border);
}

.drawer__logo {
  height: 34px;
  width: auto;
}

.drawer__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-strong);
}

.drawer__links {
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--space-3);
}

.drawer__link {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-medium);
  color: var(--text);
}

.drawer__link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-strong);
}

.drawer__link--active {
  position: relative;
  color: var(--accent-strong);
}

/* Current page: an accent bar as well as the colour, so it is never
   conveyed by colour alone */
.drawer__link--active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25%;
  bottom: 25%;
  width: 3px;
  border-radius: var(--radius-full);
  background: var(--accent);
}

.drawer__link--sub {
  min-height: 44px;
  padding-left: var(--space-8);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text-muted);
}

.drawer__footer {
  margin-top: auto;
  padding: var(--space-5);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.drawer__email {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-align: center;
}

@media (min-width: 900px) {
  .drawer,
  .drawer-overlay {
    display: none;
  }
}

/* ===========================================================================
   FOOTER
   ============================================================================ */

.footer {
  position: relative;
  margin-top: var(--space-16);
  padding: var(--space-16) 0 var(--space-8);
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(5, 7, 10, 0.6));
}

.footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 50%;
  width: min(640px, 80%);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.6;
}

.footer--minimal {
  padding: var(--space-8) 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

@media (min-width: 640px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: var(--space-12);
  }
}

.footer__logo {
  height: 28px;
  width: auto;
  margin-bottom: var(--space-4);
}

.footer__tagline {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--text-strong);
  margin-bottom: var(--space-5);
}

.footer__address {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-muted);
}

.footer__col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}

.footer__heading {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--text-subtle);
}

.footer__link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer__link:hover {
  color: var(--text-strong);
}

.footer__note {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin: var(--space-2) 0 var(--space-3);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
}

.footer__legal {
  font-size: var(--text-xs);
  color: var(--text-subtle);
}

.footer__legal-link {
  font-size: var(--text-xs);
  color: var(--text-muted);
}