/* navigation.css — sticky header + mobile drawer */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.header.is-stuck { border-color: var(--border); box-shadow: var(--shadow-sm); }

.nav {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
  min-height: var(--header-h);
}

.brand { display: inline-flex; align-items: center; gap: .7rem; min-width: 0; }
.brand img { width: 46px; height: 46px; object-fit: contain; flex: 0 0 auto; }
.brand__text { min-width: 0; }
.brand__name { display: block; font-weight: 900; font-size: .92rem; letter-spacing: -.01em; line-height: 1.15; white-space: nowrap; }
.brand__sub { display: block; font-size: .56rem; letter-spacing: .2em; text-transform: uppercase; color: var(--fg-muted); white-space: nowrap; }

.nav__right { display: flex; align-items: center; gap: 1.1rem; justify-self: end; }
.nav__links { display: flex; align-items: center; gap: .95rem; }
.nav__links a {
  font-size: .88rem; font-weight: 600; color: var(--kkf-grey-900);
  position: relative; padding-block: .3rem; white-space: nowrap;
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--kkf-sky); transition: width var(--transition);
}
.nav__links a:hover::after, .nav__links a[aria-current="page"]::after { width: 100%; }
.nav__links a[aria-current="page"] { color: var(--kkf-sky-dark); }

.nav__cta { display: flex; gap: .5rem; }

.nav__toggle {
  display: none; width: 46px; height: 46px; border-radius: 12px; border: 1px solid var(--border);
  place-items: center;
}
.nav__toggle span { display: block; width: 20px; height: 2px; background: var(--kkf-ink); position: relative; transition: var(--transition); }
.nav__toggle span::before, .nav__toggle span::after {
  content: ""; position: absolute; left: 0; width: 20px; height: 2px; background: var(--kkf-ink); transition: var(--transition);
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after { top: 6px; }
.nav__toggle[aria-expanded="true"] span { background: transparent; }
.nav__toggle[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.nav__toggle[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

.drawer {
  position: fixed; top: var(--header-h); left: 0; right: 0; bottom: auto;
  height: calc(100dvh - var(--header-h)); z-index: 99;
  background: #fff; padding: 1.5rem var(--gutter) 2.5rem;

  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition);
  display: none;
}
.drawer.is-open { transform: none; }
.drawer a {
  display: block; padding: .95rem 0; font-size: 1.15rem; font-weight: 700;
  border-bottom: 1px solid var(--border);
}
.drawer a[aria-current="page"] { color: var(--kkf-sky-dark); }
.drawer .btn-row { margin-top: 1.6rem; }
.drawer .btn { flex: 1 1 180px; }
body.no-scroll { overflow: hidden; }

/* Mobile drawer polish */
.drawer {
  background: linear-gradient(180deg, #fff 0%, var(--kkf-grey-100, #f6f8fa) 100%);
  padding-bottom: calc(2.5rem + env(safe-area-inset-bottom));
  box-shadow: -18px 0 40px -30px rgba(0,0,0,.5);
}
.drawer a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem .25rem; font-size: 1.05rem; font-weight: 700;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition), padding-left var(--transition);
}
.drawer a::after {
  content: "\203A"; font-size: 1.25rem; line-height: 1; color: var(--fg-muted);
}
.drawer a:hover, .drawer a:focus-visible { color: var(--kkf-sky-dark); padding-left: .55rem; }
.drawer a[aria-current="page"] { color: var(--kkf-sky-dark); }
.drawer a[aria-current="page"]::after { color: var(--kkf-sky-dark); }
.drawer .btn-row { margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: .7rem; }
.drawer .btn { flex: 1 1 180px; justify-content: center; }
@media (max-width: 640px) {
  .drawer { padding-inline: var(--gutter); }
  .drawer .btn { flex: 1 1 100%; }
}