/* Shared navigation styles.
 *
 * Styles the site navigation (rendered by src/nav/index.js) uniformly across
 * every page, so the nav look-and-feel is defined once instead of being
 * copy-pasted into each page's stylesheet.
 *
 * Mobile-first: below 860px the nav is a compact bar with a hamburger button
 * that opens a full-screen menu. At 860px and above the classic horizontal
 * bar with hover dropdowns is shown. The breakpoint is the only place that
 * decides which UI is applied, so no page-specific media queries are needed.
 *
 * Pages whose layout needs a different nav placement can override the outer
 * box in their own CSS, e.g. full-width navs or a different outer margin:
 *   .nav { width: 100%; margin: 0 0 16px; }
 */

.nav {
  width: 100%;
  background: #333;
  color: #fff;
  border-radius: 14px;
  margin: 24px 24px 16px;
  position: relative;
}

/* --- Mobile toggle bar ------------------------------------------------ */

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 15px 18px;
  border: 0;
  background: transparent;
  color: #fff;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.nav-brand {
  letter-spacing: .02em;
}

.nav-burger {
  position: relative;
  width: 22px;
  height: 16px;
}

.nav-burger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease, top .25s ease;
}

.nav-burger span:nth-child(1) { top: 0; }
.nav-burger span:nth-child(2) { top: 7px; }
.nav-burger span:nth-child(3) { top: 14px; }

.nav.nav-open .nav-burger span:nth-child(1) { top: 7px; transform: rotate(45deg); }
.nav.nav-open .nav-burger span:nth-child(2) { opacity: 0; }
.nav.nav-open .nav-burger span:nth-child(3) { top: 7px; transform: rotate(-45deg); }

/* --- Menu: hidden on mobile, full-screen overlay when open ------------- */

.nav ul {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav.nav-open ul {
  display: flex;
  position: fixed;
  inset: 0;
  z-index: 10000;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: rgba(20, 20, 26, .98);
  padding: 80px 16px 24px;
  overflow-y: auto;
  animation: nav-fade .28s ease;
}

@keyframes nav-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.nav.nav-open .nav-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10001;
  width: 48px;
  height: 48px;
  padding: 0;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, .1);
}

.nav.nav-open .nav-brand {
  display: none;
}

.nav.nav-open a {
  display: block;
  color: #fff;
  text-decoration: none;
  font-weight: 400;
  font-size: 20px;
  text-align: center;
  padding: 12px 24px;
  border-radius: 10px;
}

.nav.nav-open a:hover {
  background: rgba(255, 255, 255, .12);
}

.nav.nav-open a[aria-current="page"] {
  background: rgba(255, 255, 255, .15);
}

.nav.nav-open .dropdown-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: static;
  background: transparent;
  box-shadow: none;
  border-radius: 0;
  overflow: visible;
}

.nav.nav-open .dropdown-content a {
  font-size: 15px;
  opacity: .85;
  padding: 8px 24px;
}

body.nav-locked {
  overflow: hidden;
}

/* --- Desktop: classic horizontal bar ----------------------------------- */

@media (min-width: 860px) {
  .nav {
    overflow: visible;
  }

  .nav-toggle {
    display: none;
  }

  .nav ul {
    display: flex;
    flex-wrap: wrap;
  }

  .nav li {
    position: relative;
  }

  .nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 400;
    padding: 12px 15px;
    display: block;
    line-height: normal;
    text-align: center;
    white-space: nowrap;
  }

  .nav a:hover {
    background: #666;
    text-decoration: none;
  }

  .nav li:first-child > a {
    border-radius: 14px 0 0 14px;
  }

  .nav .dropdown-content {
    display: none;
    position: absolute;
    background-color: #333;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    border-radius: 0 0 14px 14px;
    top: 100%;
    left: 0;
    overflow: hidden;
  }

  .nav li:hover .dropdown-content {
    display: block;
  }

  .nav .dropdown-content a {
    padding: 12px 15px;
    text-align: left;
    white-space: nowrap;
    border-radius: 0;
  }

  .nav .dropdown-content a:last-child {
    border-radius: 0 0 14px 14px;
  }

  .nav .dropdown-content a:hover {
    background-color: #666;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav.nav-open ul {
    animation: none;
  }
}