/* ==========================================================================
   responsive.css — media queries (mobile-first: ajustes para telas menores
   e refinamentos para tablets/desktops)
   ========================================================================== */

/* ---------- Até 900px: menu hambúrguer ---------- */
@media (max-width: 900px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg-white);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 8px 0;
        display: none;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        display: block;
        padding: 12px 20px;
        border-bottom: none;
        border-left: 3px solid transparent;
    }

    .nav-links a.active {
        border-left-color: var(--secondary);
        background: var(--bg-light);
    }
}

/* ---------- Até 768px: tablets pequenos e celulares ---------- */
@media (max-width: 768px) {
    .hero {
        padding: 48px 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero .subtitle {
        font-size: 1.1rem;
    }

    .hero-img {
        width: 140px;
        height: 140px;
    }

    .page-header h1 {
        font-size: 1.7rem;
    }

    .section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 1.45rem;
    }

    /* Timeline acadêmica empilhada */
    .timeline-item {
        flex-direction: column;
    }

    .timeline-marker {
        flex-direction: row;
        width: 100%;
        min-width: 0;
        margin-right: 0;
        margin-bottom: 12px;
        gap: 10px;
        align-items: center;
    }

    .timeline-marker::after {
        display: none;
    }

    .badge {
        margin-top: 0;
    }

    /* Sobre em coluna única */
    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-photo {
        max-width: 260px;
        margin: 0 auto;
    }

    /* Contato em coluna única */
    .contact-content {
        grid-template-columns: 1fr;
    }

    /* Experiência: menos recuo */
    .experience-timeline {
        padding-left: 24px;
        margin-left: 4px;
    }

    .experience-item::before {
        left: -33px;
    }

    .publication-header {
        flex-direction: column;
        gap: 8px;
    }

    /* Publication item em coluna única */
    .publication-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .publication-actions {
        align-items: stretch;
        width: 100%;
    }

    .publication-item .btn {
        width: 100%;
        text-align: center;
    }

    /* Social links grid em 1 coluna */
    .social-links-grid {
        grid-template-columns: 1fr;
    }

    /* Reduzir gaps em mobile */
    .about-grid {
        gap: 24px;
    }

    .contact-content {
        gap: 28px;
    }

    /* Projetos com padding reduzido */
    .project-card {
        padding: 20px;
    }

    .project-header h3 {
        font-size: 1.1rem;
    }

    /* Contact form padding reduzido */
    .contact-form,
    .contact-info {
        padding: 20px;
    }

    /* Experience timeline reduzido */
    .experience-item {
        padding-left: 8px;
    }

    .experience-item::before {
        left: -28px;
    }
}

/* ---------- Até 480px: celulares ---------- */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero h1 {
        font-size: 1.65rem;
    }

    .hero-cta .btn {
        width: 100%;
        text-align: center;
    }

    .highlight-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .highlight-card {
        padding: 20px 12px;
    }

    .highlight-card .number {
        font-size: 1.9rem;
    }

    .certificates-grid {
        grid-template-columns: 1fr;
    }

    .certificate-filters {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-reset {
        align-self: stretch;
        text-align: center;
    }

    /* Cards com padding reduzido */
    .card,
    .publication-item,
    .project-card {
        padding: 16px 18px;
    }

    /* Buttons com melhor área de clique */
    .btn-small {
        padding: 8px 20px;
        font-size: 0.9rem;
    }

    /* Hero CTA buttons em mobile */
    .hero-cta {
        gap: 10px;
    }

    .hero-cta .btn {
        flex: 1;
        min-height: 44px;
    }

    /* Timeline reduzido em altura */
    .timeline-item {
        margin-bottom: 32px;
    }

    /* Badges e tags menores */
    .year-badge,
    .badge {
        font-size: 0.75rem;
        padding: 3px 10px;
    }

    /* Footer links em coluna */
    .footer-inner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }

    .footer-links {
        flex-direction: column;
        gap: 8px;
    }

    /* Info items com melhor espaçamento */
    .info-item {
        margin-bottom: 12px;
    }

    /* Form com melhor spacing */
    .form-group {
        margin-bottom: 16px;
    }

    /* Section padding reduzido */
    .section {
        padding: 32px 0;
    }
}

/* ---------- 600px - 900px: tablets ---------- */
@media (min-width: 600px) and (max-width: 900px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .publication-item {
        flex-direction: row;
        align-items: flex-end;
    }

    .publication-item .btn {
        width: auto;
    }

    .about-grid {
        gap: 32px;
    }

    .contact-content {
        gap: 32px;
    }
}

/* ---------- 1024px+: desktops ---------- */
@media (min-width: 1024px) {
    .hero h1 {
        font-size: 3rem;
    }

    .section {
        padding: 72px 0;
    }

    .publication-item {
        flex-direction: row;
    }

    .publication-item .btn {
        width: auto;
    }
}