/* ============================================
   NAVBAR COMPONENT
   Sticky header with scroll states
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  height: var(--navH);
  transition: height 200ms ease, background-color 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.navbar.is-scrolled {
  height: var(--navHScrolled);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadowSoft);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

/* Brand/Logo */
.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  line-height: 1;
}

.brand__logo {
  height: 32px;
  width: auto;
  display: block;
}

.brand__name {
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.brand__sub {
  font-size: 12px;
  color: var(--slate);
  margin-top: 2px;
}

/* Desktop Navigation */
.nav {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav__item {
  margin: 0;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 10px 12px;
  text-decoration: none;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  border-radius: 999px;
  transition: color 150ms ease, background-color 150ms ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 6px;
  transform: translateX(-50%);
  height: 2px;
  width: 0%;
  border-radius: 999px;
  background: var(--accent);
  transition: width 160ms ease;
}

.nav__link:hover {
  color: var(--accent);
}

.nav__link:hover::after {
  width: 70%;
}

/* Active link state */
.nav__link[aria-current="page"] {
  color: var(--accent);
}

.nav__link[aria-current="page"]::after {
  width: 70%;
}

/* Navbar Actions */
.navbar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Mobile Menu Toggle Button */
.icon-btn {
  display: none;
  height: 40px;
  width: 44px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.icon-btn:hover {
  border-color: var(--accent);
  background: var(--surfaceMuted);
}

.icon-btn__bars {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
  margin: 0 auto;
}

.icon-btn__bars::before,
.icon-btn__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: transform 200ms ease;
}

.icon-btn__bars::before {
  top: -6px;
}

.icon-btn__bars::after {
  top: 6px;
}

/* Mobile Menu */
.mobile-menu {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 14px 20px 18px;
}

.mobile-menu__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mobile-menu__link {
  display: block;
  padding: 12px 10px;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.005em;
  transition: background-color 150ms ease, color 150ms ease;
}

.mobile-menu__link:hover {
  background: var(--surfaceMuted);
  color: var(--accent);
}

.mobile-menu__link[aria-current="page"] {
  background: var(--surfaceMuted);
  color: var(--accent);
}

.mobile-menu__actions {
  margin-top: 12px;
}

/* Responsive Styles */
@media (max-width: 900px) {
  .nav {
    display: none;
  }

  .icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .brand__sub {
    display: none;
  }

  .brand__logo {
    height: 28px;
  }

  .navbar__inner {
    padding: 0 16px;
  }
}

@media (max-width: 620px) {
  .brand__logo {
    height: 24px;
  }
}

@media (max-width: 620px) {
  .brand__name {
    font-size: 16px;
  }
}