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

body {
    font-family: 'Lato', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

/* Tipografia */
h1, h2, h3 {
    font-family: 'Montserrat', sans-serif;
    color: #2c3e50;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 2rem; border-bottom: 2px solid #3498db; padding-bottom: 0.5rem; display: inline-block; }
h3 { font-size: 1.5rem; margin-top: 1.5rem; color: #34495e; }

p { margin-bottom: 1rem; font-size: 1.1rem; }

/* Layout */
.container {
    width: 90%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #2c3e50, #3498db);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

header h1 { color: white; }
.subtitle { font-size: 1.2rem; opacity: 0.9; margin-bottom: 1.5rem; }
.authors { font-size: 1.1rem; font-weight: bold; background: rgba(255,255,255,0.1); display: inline-block; padding: 0.5rem 1.5rem; border-radius: 50px; }

/* Navegação */
nav {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav ul li { margin: 0; }

nav ul li a {
    display: block;
    padding: 1rem 1.5rem;
    text-decoration: none;
    color: #555;
    font-weight: 700;
    transition: all 0.3s;
}

nav ul li a:hover {
    background: #3498db;
    color: white;
}

/* Conteúdo Principal */
main { padding: 3rem 0; }

section {
    background: white;
    padding: 2.5rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

/* Elementos Específicos */
.equation-box {
    background: #f4f6f7;
    padding: 1.5rem;
    border-radius: 5px;
    text-align: center;
    margin: 1.5rem 0;
    border-left: 4px solid #3498db;
    overflow-x: auto;
}

.equation-box.small { display: inline-block; padding: 0.5rem 1.5rem; }

.params-list {
    list-style: none;
    background: #e8f6f3;
    padding: 1.5rem;
    border-radius: 5px;
    margin-bottom: 1.5rem;
}

.params-list li { margin-bottom: 0.5rem; }
.params-list li::before { content: "•"; color: #16a085; font-weight: bold; display: inline-block; width: 1em; margin-left: -1em; }

.note {
    background: #fff8e1;
    border-left: 4px solid #f1c40f;
    padding: 1rem;
    font-style: italic;
}

/* Grid de Comparação */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.card {
    background: #fdfdfd;
    padding: 1.5rem;
    border: 1px solid #eee;
    border-radius: 8px;
}

.card h3 { margin-top: 0; color: #e74c3c; }
.card:last-child h3 { color: #27ae60; }

/* Imagens */
figure {
    text-align: center;
    margin: 2rem 0;
}

figure img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    border: 1px solid #ddd;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

figcaption {
    margin-top: 0.5rem;
    color: #777;
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    background: #2c3e50;
    color: white;
    margin-top: 2rem;
}

/* Responsividade */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    .comparison-grid { grid-template-columns: 1fr; }
    nav ul li a { padding: 0.8rem 1rem; font-size: 0.9rem; }
    section { padding: 1.5rem; }
}