/* ═══════════════════════════════════════════════════════════════════
   NAVBAR — .ia-nav
   Fixed top, transparent bg, scroll shadow on scroll.
   Flex layout: brand left, links center, user/login right.
   Inclui hamburger + overlay (mobile menu @ 768px).
   Extraído de base.css na Sessão 5.
   ═══════════════════════════════════════════════════════════════════ */
.ia-nav {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    transition: background .4s ease, box-shadow .4s ease;
}

[data-theme="light"] .ia-nav {
    border-bottom-color: rgba(0,0,0,0.06);
}

.ia-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 22px 24px;
    gap: 16px;
    transition: padding .3s ease;
}

.ia-nav-left {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-shrink: 0;
}

.ia-nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.ia-nav.scrolled {
    box-shadow: 0 1px 40px rgba(0,0,0,0.3);
}

.ia-nav.scrolled .ia-nav-inner {
    padding-top: 14px;
    padding-bottom: 14px;
}

[data-theme="light"] .ia-nav.scrolled {
    box-shadow: 0 1px 30px rgba(27, 42, 74, 0.08);
}

/* ── Brand ── */
.ia-nav-brand {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    font-family: var(--font-heading);
    display: flex;
    align-items: center;
    gap: 10px;
    transition: color .2s ease;
    letter-spacing: 0.01em;
}

.ia-nav-brand-icon {
    font-size: 1.1rem;
    color: var(--accent);
    flex-shrink: 0;
    transition: color .2s ease;
}

.ia-nav-brand:hover .ia-nav-brand-icon {
    color: var(--accent-hover);
}

.ia-nav-brand:hover {
    color: var(--accent);
}

/* ── Nav links ── */
.ia-nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.ia-nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: .875rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 100px;
    transition: color .2s ease, background .2s ease;
}

.ia-nav-link:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.06);
}

[data-theme="light"] .ia-nav-link:hover {
    background: rgba(27, 42, 74, 0.05);
}

.ia-nav-link.active {
    color: var(--text-primary);
    background: rgba(255,255,255,0.08);
}

[data-theme="light"] .ia-nav-link.active {
    background: rgba(27, 42, 74, 0.07);
}

/* ── User dropdown ── */
.ia-nav-user {
    position: relative;
    display: inline-block;
}

.ia-nav-user-btn {
    background: rgba(255,255,255,0.06);
    border: none;
    border-radius: 100px;
    color: var(--text-secondary);
    padding: 8px 14px;
    font-size: .85rem;
    cursor: pointer;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all .2s ease;
}

[data-theme="light"] .ia-nav-user-btn {
    background: rgba(27, 42, 74, 0.06);
}

.ia-nav-user-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.1);
}

[data-theme="light"] .ia-nav-user-btn:hover {
    background: rgba(27, 42, 74, 0.1);
}

.ia-nav-user-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    min-width: 190px;
    padding: 6px 0;
    box-shadow: 0 16px 48px rgba(0,0,0,0.4);
    animation: ia-menuIn .15s ease;
}

[data-theme="light"] .ia-nav-user-menu {
    background: #FDFBF7;
    border-color: rgba(27, 42, 74, 0.1);
    box-shadow: 0 16px 48px rgba(27, 42, 74, 0.12);
}

@keyframes ia-menuIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.ia-nav-user.open .ia-nav-user-menu {
    display: block;
}

.ia-nav-user-menu a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: .85rem;
    transition: all .15s;
}

.ia-nav-user-menu a:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.04);
}

[data-theme="light"] .ia-nav-user-menu a:hover {
    background: rgba(27, 42, 74, 0.04);
}

.ia-nav-user-menu hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 4px 0;
}

.ia-nav-logout-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    width: 100%;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: .85rem;
    font-family: inherit;
    text-align: left;
    transition: all .15s;
}

.ia-nav-logout-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.04);
}

[data-theme="light"] .ia-nav-logout-btn:hover {
    background: rgba(27, 42, 74, 0.04);
}

/* ── Login link (unauthenticated) ── */
.ia-nav-login {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: .85rem;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: 100px;
    border: 1px solid rgba(255,255,255,0.12);
    transition: all .2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

[data-theme="light"] .ia-nav-login {
    border-color: rgba(27, 42, 74, 0.18);
}

.ia-nav-login:hover {
    color: var(--text-primary);
    border-color: rgba(255,255,255,0.22);
    background: rgba(255,255,255,0.04);
}

[data-theme="light"] .ia-nav-login:hover {
    border-color: rgba(27, 42, 74, 0.3);
    background: rgba(27, 42, 74, 0.04);
}

/* ═══════════════════════════════════════════════════════════════════
   MOBILE — em telas autenticadas, a sidebar lateral assume a navegação.
   Em telas públicas (landing/login), só brand + tema + entrar aparecem.
   ═══════════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
    .ia-nav-links { display: none; }
}