:root {
    --azul-principal: #2A6BF2;
    --azul-claro: #6C9FFF;
    --preto: #0D0D0D;
    --cinza-escuro: #1E1E1E;
    --branco: #F2F2F2;
    --cinza-claro: #e0e0e0;
}

.dark-mode {
    --bg-primary: var(--preto);
    --bg-secondary: var(--cinza-escuro);
    --text-primary: var(--branco);
    --text-secondary: var(--cinza-claro);
    --card-bg: var(--cinza-escuro);
}

.light-mode {
    --bg-primary: var(--branco);
    --bg-secondary: var(--cinza-claro);
    --text-primary: var(--preto);
    --text-secondary: var(--cinza-escuro);
    --card-bg: var(--cinza-claro);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
}

h1,
h2,
h3,
h4 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
}

#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background-color: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    z-index: 1000;
    padding: 15px 0;
}

.light-mode header {
    background-color: rgba(242, 242, 242, 0.9);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--azul-principal);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--azul-principal);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: 20px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 80px 0 60px;
}

.hero-content {
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero h1 span {
    color: var(--azul-principal);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--azul-principal);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(42, 107, 242, 0.3);
}

.btn:hover {
    background-color: var(--azul-claro);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(42, 107, 242, 0.4);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--azul-principal);
    color: var(--azul-principal);
    margin-left: 15px;
}

.btn-outline:hover {
    background-color: var(--azul-principal);
    color: white;
}

/* Sections */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-title h2 {
    font-size: 2.5rem;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 4px;
    background-color: var(--azul-principal);
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

/* About */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 20px;
}

.about-text p {
    margin-bottom: 15px;
    color: var(--text-secondary);
}

.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 20px;
}

.skill-tag {
    padding: 8px 15px;
    background-color: var(--azul-principal);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Projects */
.projects-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 8px 20px;
    background-color: var(--card-bg);
    color: var(--text-primary);
    border: none;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn.active,
.filter-btn:hover {
    background-color: var(--azul-principal);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.project-img {
    width: 100%;
    height: 200px;
    background-color: #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #777;
    font-size: 3rem;
}

.project-info {
    padding: 20px;
}

.project-info h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.project-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.tech-tag {
    padding: 4px 10px;
    background-color: var(--azul-principal);
    color: white;
    border-radius: 15px;
    font-size: 0.7rem;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 15px;
}

.project-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

.project-link:hover {
    color: var(--azul-principal);
}

/* Education */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--azul-principal);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-content {
    padding: 20px;
    background-color: var(--card-bg);
    border-radius: 10px;
    position: relative;
}

.timeline-content h3 {
    margin-bottom: 10px;
    color: var(--azul-principal);
}

.timeline-content p {
    color: var(--text-secondary);
    margin-bottom: 5px;
}

/* Contact */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.contact-details {
    margin-bottom: 30px;
}

.contact-details p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--azul-principal);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: var(--azul-claro);
    transform: translateY(-3px);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 20px;
    border: none;
    border-radius: 5px;
    background-color: var(--card-bg);
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
}

.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

/* Footer */
footer {
    background-color: var(--preto);
    color: var(--branco);
    padding: 30px 0;
    text-align: center;
}

.light-mode footer {
    background-color: var(--cinza-escuro);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s ease forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .contact-container {
        grid-template-columns: 1fr;
    }

    .timeline::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }

    .timeline-item:nth-child(even) {
        left: 0;
    }
}

/* Adicione ao final do seu arquivo CSS existente */

/* Acessibilidade: Skip to content */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: #2A6BF2;
    color: white;
    padding: 8px;
    z-index: 1000;
    text-decoration: none;
}

.skip-to-content:focus {
    top: 0;
}

/* Otimização para leitores de tela */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Melhorias de performance para imagens */
.about-image div {
    background-size: cover;
    background-position: center;
}

/* Otimização para impressão */
@media print {
    .theme-toggle,
    .projects-filter,
    .contact-form,
    .social-links,
    .hero-buttons {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    a {
        color: black !important;
        text-decoration: underline !important;
    }
}