.app-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    border-bottom: 1px solid var(--color-border);
    background: color-mix(in srgb, var(--color-surface) 94%, transparent);
}

.app-navbar {
    padding: 0.75rem 2rem;
}

.app-navbar__inner {
    max-width: 1600px;
    margin: 0 auto;
    gap: 0.875rem;
}

.app-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-fg);
    text-decoration: none;
    white-space: nowrap;
}

.app-brand:hover {
    color: var(--color-fg);
}

.app-brand__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 0.9rem;
    background: var(--color-accent);
    color: var(--color-accent-fg);
    box-shadow: var(--shadow-xs);
    font-size: 0.95rem;
}

.app-navbar .navbar-collapse {
    gap: 1rem;
}

.app-navbar__desktop-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
    flex-shrink: 0;
}

.app-navbar__mobile-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: auto;
    flex-shrink: 0;
}

.app-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    border-radius: 0.4rem;
    padding: 0.35rem 0.55rem !important;
    color: var(--color-fg-muted);
    font-weight: 600;
    transition: color 160ms ease, box-shadow 160ms ease;
}

.app-nav-link:hover,
.app-nav-link:focus-visible,
.app-nav-link.active,
.show > .app-nav-link {
    background: transparent;
    color: var(--color-fg);
    box-shadow: inset 0 -2px 0 var(--color-accent);
}

/* ---- Dropdown panel ---- */
.app-dropdown-menu {
    min-width: 15rem;
    padding: 0.4rem;
    margin-top: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 0.875rem;
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.app-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.75rem;
    border-radius: 0.6rem;
    color: var(--color-fg);
    font-size: 0.93rem;
    transition: background 120ms ease, color 120ms ease;
}

.app-dropdown-item i {
    width: 1rem;
    flex: 0 0 auto;
    color: var(--color-accent);
    font-size: 0.95rem;
}

.app-dropdown-item:hover,
.app-dropdown-item:focus-visible {
    background: var(--color-surface-elevated);
    color: var(--color-fg);
}

.app-dropdown-item.active {
    background: color-mix(in srgb, var(--color-accent) 10%, var(--color-surface));
    color: var(--color-accent);
    font-weight: 600;
}

.btn-ghost {
    background: transparent;
    border: 1px solid transparent;
    color: var(--color-fg-muted);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
    background: transparent;
    color: var(--color-fg);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border-radius: 999px;
}

.app-navbar__toggle {
    border-color: var(--color-border);
}

.app-navbar__toggle-icon {
    font-size: 1.2rem;
}

@media (max-width: 991.98px) {
    .app-navbar {
        padding-inline: 0.75rem;
    }

    .app-navbar__inner {
        gap: 0.5rem;
    }

    .app-navbar .navbar-collapse {
        margin-top: 0.75rem;
        padding: 0.75rem;
        border: 1px solid var(--color-border);
        border-radius: 1rem;
        background: var(--color-surface);
        box-shadow: var(--shadow-sm);
    }

    .app-dropdown-menu {
        border: none;
        border-radius: 0;
        box-shadow: none;
        background: transparent;
        padding: 0 0 0 1rem;
        margin-top: 0.25rem;
    }

    .app-dropdown-item {
        border-radius: 0.5rem;
    }
}