/**
 * Rivus Navbar — Navigation Component
 * Top navigation bar with dropdowns, branding, user info
 * v1.0.0
 */

/* ============================================================
   NAVBAR BASE
   ============================================================ */
.rivus-navbar {
    background: var(--aws-bg-tertiary);
    border-bottom: 1px solid var(--aws-border-subtle);
    height: var(--navbar-height);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: stretch;
    user-select: none;
}

/* ============================================================
   BRAND
   ============================================================ */
.rivus-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0 var(--space-5);
    border-right: 1px solid var(--aws-border-subtle);
    text-decoration: none;
    flex-shrink: 0;
    transition: background var(--transition-fast);
}
.rivus-brand:hover {
    background: rgba(255,255,255,0.05);
    text-decoration: none;
}

.rivus-brand-icon {
    font-size: 20px;
    line-height: 1;
}

.rivus-brand-name {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--aws-orange);
    letter-spacing: -0.01em;
}

.rivus-brand-version {
    font-size: var(--text-xs);
    color: var(--aws-text-tertiary);
    font-family: var(--font-mono);
    align-self: flex-end;
    padding-bottom: 10px;
    margin-left: 2px;
}

/* ============================================================
   NAV ITEMS CONTAINER
   ============================================================ */
.rivus-nav {
    display: flex;
    align-items: stretch;
    flex: 1;
    padding: 0 var(--space-2);
}

/* ============================================================
   NAV ITEM (standalone link)
   ============================================================ */
.rivus-nav-item {
    display: flex;
    align-items: center;
    padding: 0 var(--space-3);
    font-size: var(--text-base);
    color: var(--aws-text-secondary);
    text-decoration: none;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
    cursor: pointer;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
    font-family: var(--font-primary);
    position: relative;
}
.rivus-nav-item:hover {
    color: var(--aws-text-primary);
    background: rgba(255,255,255,0.04);
    text-decoration: none;
}
.rivus-nav-item.active {
    color: var(--aws-text-primary);
    border-bottom-color: var(--aws-orange);
}

/* ============================================================
   DROPDOWN
   ============================================================ */
.rivus-dropdown {
    position: relative;
    display: flex;
    align-items: stretch;
}

.rivus-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 var(--space-3);
    font-size: var(--text-base);
    color: var(--aws-text-secondary);
    cursor: pointer;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
    user-select: none;
}
.rivus-dropdown-toggle:hover,
.rivus-dropdown.open .rivus-dropdown-toggle {
    color: var(--aws-text-primary);
    background: rgba(255,255,255,0.04);
}
.rivus-dropdown.active .rivus-dropdown-toggle {
    border-bottom-color: var(--aws-orange);
    color: var(--aws-text-primary);
}

.rivus-dropdown-arrow {
    font-size: 10px;
    color: var(--aws-text-tertiary);
    transition: transform var(--transition-fast);
    margin-top: 1px;
}
.rivus-dropdown.open .rivus-dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.rivus-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    min-width: 200px;
    background: var(--aws-bg-elevated);
    border: 1px solid var(--aws-border-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    overflow: hidden;
    animation: dropdownIn var(--transition-fast) ease;
}
.rivus-dropdown.open .rivus-dropdown-menu {
    display: block;
}

@keyframes dropdownIn {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

.rivus-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-base);
    color: var(--aws-text-secondary);
    text-decoration: none;
    white-space: nowrap;
    transition: background var(--transition-fast), color var(--transition-fast);
    cursor: pointer;
}
.rivus-dropdown-item:hover {
    background: var(--aws-bg-hover);
    color: var(--aws-text-primary);
    text-decoration: none;
}
.rivus-dropdown-item.active {
    color: var(--aws-text-primary);
    background: rgba(255, 153, 0, 0.08);
}

.rivus-dropdown-divider {
    height: 1px;
    background: var(--aws-border-subtle);
    margin: var(--space-1) 0;
}

.rivus-dropdown-label {
    padding: var(--space-2) var(--space-4) var(--space-1);
    font-size: var(--text-xs);
    color: var(--aws-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: var(--font-semibold);
}

/* ============================================================
   NAVBAR RIGHT — user info, version
   ============================================================ */
.rivus-nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0 var(--space-4);
    margin-left: auto;
    border-left: 1px solid var(--aws-border-subtle);
    flex-shrink: 0;
}

.rivus-nav-user {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--aws-text-secondary);
}

.rivus-nav-user-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--aws-bg-primary);
    border: 1px solid var(--aws-border-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.rivus-nav-logout {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: var(--text-sm);
    color: var(--aws-text-tertiary);
    text-decoration: none;
    border: 1px solid var(--aws-border-subtle);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}
.rivus-nav-logout:hover {
    color: var(--aws-text-primary);
    border-color: var(--aws-border-primary);
    background: var(--aws-bg-hover);
    text-decoration: none;
}

/* ============================================================
   MOBILE — hide nav on small screens
   ============================================================ */
@media (max-width: 767px) {
    .rivus-nav { display: none; }
    .rivus-brand-version { display: none; }
    .rivus-nav-user span { display: none; }
}