/* Variáveis Globais */
:root {
    --primary: #003366;
    --secondary: #00509d;
    --dark: #1a1a1a;
    --light: #f8f9fa;
    --white: #ffffff;
    --gray: #6c757d;
    --font-main: 'Inter', sans-serif;
    --font-serif: 'Playfair Display', serif;
    --transition: all 0.3s ease;
}

/* Reset Básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--white);
}

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

/* Header & Nav */
header {
    background-color: rgba(255, 255, 255, 0.95);
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--dark);
}

.logo span {
    color: var(--primary);
    font-weight: 300;
}

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

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

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 400;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(255,255,255,0.8), rgba(255,255,255,0.8)), url('https://images.unsplash.com/photo-1517048676732-d65bc937f952?auto=format&fit=crop&q=80&w=2070') center/cover;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-text {
    max-width: 700px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 5rem;
    line-height: 1.1;
    margin-bottom: 10px;
    color: var(--primary);
}

.hero .subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--gray);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 3px;
}

.hero .description {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: var(--dark);
}

.hero-btns {
    display: flex;
    gap: 15px;
}

/* Botões */
.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    font-weight: 600;
    border-radius: 4px;
    transition: var(--transition);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--secondary);
}

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-white {
    background-color: var(--white);
    color: var(--primary);
}

/* Seções Gerais */
section {
    padding: 100px 0;
}

.section-header {
    margin-bottom: 50px;
    text-align: center;
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.underline {
    width: 60px;
    height: 3px;
    background-color: var(--primary);
    margin: 0 auto;
}

/* About */
.about {
    background-color: var(--light);
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.2rem;
}

.about-text p {
    margin-bottom: 20px;
}

/* Projects Grid */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
}

.card-img {
    height: 250px;
    width: 100%;
}

.card-body {
    padding: 25px;
}

.card-body h3 {
    font-family: var(--font-serif);
    margin-bottom: 10px;
}

.card-body p {
    color: var(--gray);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: #e9ecef;
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
    text-transform: uppercase;
}

/* Publications */
.publications {
    background-color: var(--primary);
    color: var(--white);
}

.featured-pub {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.label {
    display: block;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.8rem;
    margin-bottom: 20px;
    opacity: 0.8;
}

.featured-pub h2 {
    font-family: var(--font-serif);
    font-size: 3rem;
    margin-bottom: 10px;
}

.featured-pub h3 {
    font-weight: 300;
    font-size: 1.5rem;
    margin-bottom: 30px;
    font-style: italic;
}

.featured-pub p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

/* Contact */
.contact {
    text-align: center;
}

.email-link {
    display: block;
    margin-top: 30px;
    font-size: 2rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.email-link:hover {
    opacity: 0.7;
}

/* Footer */
footer {
    padding: 50px 0;
    background-color: var(--dark);
    color: var(--white);
    text-align: center;
}

.footer-logo {
    font-size: 1.2rem;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.footer-logo span {
    color: var(--primary);
}

footer p {
    font-size: 0.8rem;
    opacity: 0.5;
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--dark);
    transition: var(--transition);
}

/* Responsividade */
@media (max-width: 768px) {
    .hero h1 { font-size: 3rem; }
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 80px;
        left: 0;
        background-color: var(--white);
        text-align: center;
        box-shadow: 0 10px 10px rgba(0,0,0,0.05);
    }
    .nav-links.active { display: flex; }
    .nav-links li { margin: 20px 0; }
    .menu-toggle { display: block; }
    .featured-pub h2 { font-size: 2rem; }
    .email-link { font-size: 1.2rem; }
}

/* Animações Simples */
.fade-in {
    animation: fadeIn 1.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}