html {
  scroll-padding-top: calc(var(--header-height, 64px) + 12px);
}

.site-header,
.header-sticky-wrap {
  position: sticky;
  top: 0;
  z-index: 150;
  background: var(--bg);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.site-header {
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled,
.header-sticky-wrap.is-scrolled {
  border-bottom-color: var(--card-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  padding-bottom: 12px;
}

.header-sticky-wrap {
  grid-column: 1 / -1;
  margin: -24px -20px 20px;
  padding: 20px 20px 12px;
  border-bottom: 1px solid transparent;
}

@media (min-width: 960px) {
  .header-sticky-wrap {
    margin: -20px -28px 16px;
    padding: 20px 28px 12px;
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  cursor: pointer;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 180;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 190;
  width: min(320px, 88vw);
  height: 100dvh;
  background: var(--card);
  border-right: 1px solid var(--card-border);
  box-shadow: 8px 0 32px rgba(0, 0, 0, 0.12);
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.mobile-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--card-border);
  flex-shrink: 0;
}

.mobile-drawer-head .logo {
  font-size: 1.1rem;
}

.mobile-drawer-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
}

.mobile-drawer-close:hover { color: var(--text); }

.mobile-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0 24px;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav-group {
  padding: 12px 20px 4px;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.mobile-nav a,
.mobile-nav button.mobile-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 14px 20px;
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  border-left: 3px solid transparent;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.mobile-nav a:hover,
.mobile-nav button.mobile-nav-item:hover,
.mobile-nav a:focus-visible,
.mobile-nav button.mobile-nav-item:focus-visible {
  background: var(--accent-dim, rgba(126, 184, 154, 0.1));
  color: var(--accent);
}

.mobile-nav a.is-active,
.mobile-nav button.mobile-nav-item.is-active {
  border-left-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim, rgba(126, 184, 154, 0.08));
}

.mobile-nav a.nav-cta {
  color: var(--accent);
  font-weight: 500;
}

.mobile-nav-divider {
  height: 1px;
  background: var(--card-border);
  margin: 8px 20px;
}

.mobile-nav-logout {
  color: var(--text-muted) !important;
}

.mobile-nav-foot {
  padding: 16px 20px;
  border-top: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.mobile-nav-foot .lang-switch { margin: 0; }

body.nav-open {
  overflow: hidden;
}

[id] {
  scroll-margin-top: calc(var(--header-height, 64px) + 16px);
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }

  .site-header > .lang-switch {
    display: none;
  }

  .site-header .header-right > .lang-switch {
    display: none;
  }

  .site-header .top-nav,
  .top-bar .top-nav {
    display: none;
  }

  .site-header {
    flex-wrap: nowrap;
    gap: 8px;
    padding: 12px 16px;
    align-items: center;
  }

  .site-header .logo {
    flex: 0 1 auto;
    min-width: 0;
  }

  .header-left .logo {
    flex: 0 1 auto;
    min-width: 0;
  }

  .header-sticky-wrap .top-bar {
    flex-wrap: nowrap;
    margin-bottom: 0;
  }

  .header-right {
    margin-left: auto;
  }
}

@media (min-width: 901px) {
  .mobile-drawer,
  .nav-backdrop,
  .nav-toggle {
    display: none !important;
  }
}