:root {
    --primary-color: #004085;
    --secondary-color: #0056b3;
    --hover-color: #003f7d;
    --background-color: #f9f9f9;
    --text-color: #333;
    --light-color: #fff;
    --border-color: #ddd;
    --table-header-bg: #f2f2f2;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
}

/* Reset e Estilos Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 16px;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 2rem auto;
    background: var(--light-color);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

/* Cabeçalho */
header {
    background-color: var(--primary-color);
    color: var(--light-color);
    text-align: center;
    padding: 1.5rem 0;
}

header h1 {
    margin: 0;
    font-size: clamp(1.5rem, 2.5vw, 2.2rem);
}

/* Navegação */
nav {
    background-color: var(--secondary-color);
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0;
    flex-grow: 1;
    text-align: center;
}

nav ul li a {
    text-decoration: none;
    color: var(--light-color);
    padding: 1rem;
    display: block;
    transition: all 0.3s ease;
    font-weight: 500;
}

nav ul li a:hover,
nav ul li a:focus {
    background-color: var(--hover-color);
    outline: none;
}

nav ul li a.active {
    background-color: var(--hover-color);
    font-weight: bold;
}

/* Conteúdo Principal */
main {
    padding: 2rem;
    min-height: 60vh;
}

main h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 1.8rem;
}

/* Seções */
.section-title {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.form-section, .list-section {
    margin-bottom: 3rem;
}

/* Formulários */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--primary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--secondary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 86, 179, 0.2);
}

/* Tabelas */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

th, td {
    padding: 1rem;
    text-align: left;
    border: 1px solid var(--border-color);
}

th {
    background-color: var(--table-header-bg);
    color: var(--text-color);
    font-weight: 600;
}

tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.02);
}

tr:hover {
    background-color: rgba(0, 86, 179, 0.05);
}

/* Botões */
button, .btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    background-color: var(--secondary-color);
    color: var(--light-color);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 500;
    display: inline-block;
    text-align: center;
}

button:hover, .btn:hover,
button:focus, .btn:focus {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    outline: none;
}

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

.btn-warning {
    background-color: var(--warning-color);
    color: var(--text-color);
}

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

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

/* Barra de Pesquisa */
.search-bar {
    display: flex;
    margin-bottom: 1.5rem;
    gap: 0.5rem;
}

.search-bar input {
    flex-grow: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.search-btn {
    padding: 0.75rem 1.5rem;
}

/* Dashboard */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.card {
    background: var(--light-color);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.card .count {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--secondary-color);
}

/* Autores */
.autores-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.autor-card {
    background: var(--light-color);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.autor-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.autor-img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 1rem;
    border: 3px solid var(--secondary-color);
}

.autor-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.autor-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.autor-card p {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

/* Rodapé */
footer {
    background-color: var(--primary-color);
    color: var(--light-color);
    text-align: center;
    padding: 1.5rem 0;
    font-size: 0.9rem;
    margin-top: 2rem;
}

/* Responsividade */
@media (max-width: 768px) {
    .container {
        width: 95%;
        margin: 1rem auto;
    }
    
    nav ul {
        flex-direction: column;
    }
    
    th, td {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
    
    main {
        padding: 1.5rem;
    }
    
    .dashboard {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header {
        padding: 1rem 0;
    }
    
    main {
        padding: 1rem;
    }
    
    th, td {
        padding: 0.5rem;
        font-size: 0.85rem;
    }
    
    .autores-grid {
        grid-template-columns: 1fr;
    }
    
    .search-bar {
        flex-direction: column;
    }
    
    .search-btn {
        width: 100%;
    }
}