.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  border-bottom: 1px solid var(--color-hairline);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
}

.app-header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  font-size: var(--font-size-body);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: block;
  flex: 0 0 auto;
  border-radius: 9px;
  object-fit: cover;
}

.desktop-nav {
  height: 100%;
  display: flex;
  align-items: stretch;
  gap: 22px;
}

.desktop-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  color: var(--color-secondary);
  font-size: var(--font-size-small);
  font-weight: 550;
  text-decoration: none;
  transition: color var(--motion-fast);
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  color: var(--color-ink);
}

.desktop-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  border-radius: 2px 2px 0 0;
  background: var(--color-brand);
}

.app-header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

.account-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 4px 10px 4px 5px;
  border-radius: var(--button-radius);
  background: transparent;
  color: var(--color-secondary);
  cursor: pointer;
  font-size: var(--font-size-small);
  font-weight: 600;
}

.account-button:hover,
.account-button[aria-expanded="true"] {
  background: var(--button-soft);
  color: var(--button-soft-ink);
}

.account-avatar {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--color-brand-soft);
  color: var(--color-brand-ink);
  font-size: var(--font-size-small);
  font-weight: 750;
}

.account-menu-wrap {
  position: relative;
}

.account-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 208px;
  padding: 7px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.account-menu[hidden] {
  display: none;
}

.account-menu a,
.account-menu button {
  width: 100%;
  min-height: 40px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-charcoal);
  cursor: pointer;
  font-size: var(--font-size-small);
  font-weight: 520;
  text-align: left;
  text-decoration: none;
}

.account-menu a:hover,
.account-menu button:hover {
  background: var(--color-surface-subtle);
}

.account-menu-divider {
  height: 1px;
  margin: 6px 4px;
  background: var(--color-hairline);
}

.mobile-menu-button,
.mobile-drawer,
.mobile-drawer-backdrop {
  display: none;
}

@media (max-width: 759px) {
  .app-header-inner {
    gap: 12px;
  }

  .desktop-nav,
  .account-menu-wrap {
    display: none;
  }

  .app-header-actions {
    gap: 2px;
  }

  .mobile-menu-button {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border: 1px solid var(--button-secondary-border);
    border-radius: var(--button-radius);
    background: var(--button-secondary);
    color: var(--button-secondary-ink);
    cursor: pointer;
  }

  .mobile-menu-button:hover,
  .mobile-menu-button[aria-expanded="true"] {
    background: var(--button-soft);
    color: var(--button-soft-ink);
  }

  .mobile-menu-button .icon { width: 24px; height: 24px; }

  .mobile-drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: 180;
    display: block;
    background: rgb(10 16 14 / 44%);
    backdrop-filter: blur(3px);
  }

  .mobile-drawer-backdrop[hidden] { display: none; }

  .mobile-drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 190;
    width: min(78vw, 380px);
    display: flex;
    flex-direction: column;
    padding: max(18px, env(safe-area-inset-top)) 20px max(22px, env(safe-area-inset-bottom));
    border-left: 1px solid var(--color-hairline);
    background: var(--color-surface);
    box-shadow: -18px 0 48px rgb(0 0 0 / 12%);
    transform: translateX(105%);
    transition: transform var(--motion-base);
  }

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

  .mobile-drawer-head {
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--color-hairline);
    font-size: var(--font-size-card);
  }

  .mobile-drawer-nav,
  .mobile-drawer-secondary {
    display: grid;
    gap: 6px;
    padding-block: 18px;
  }

  .mobile-drawer-secondary {
    margin-top: auto;
    border-top: 1px solid var(--color-hairline);
  }

  .mobile-drawer a,
  .mobile-drawer button:not(.icon-button):not(.close-button) {
    min-height: 54px;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-charcoal);
    cursor: pointer;
    font-size: var(--font-size-body);
    font-weight: 560;
    text-decoration: none;
    text-align: left;
  }

  .mobile-drawer a[aria-current="page"],
  .mobile-drawer a:hover,
  .mobile-drawer button:not(.close-button):hover { background: var(--color-brand-soft); color: var(--color-brand-ink); }

  .mobile-drawer .icon { width: 22px; height: 22px; }
  body.drawer-open { overflow: hidden; }
}