/* Reset e Estilos Globais */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4cc9f0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4bb543;
    --warning-color: #f0ad4e;
    --danger-color: #d9534f;
}

body {
    background-color: #f5f5f5;
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header h1 i {
    margin-right: 10px;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Navigation */
nav {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

nav li {
    margin: 0 15px;
}

nav a {
    display: block;
    padding: 1rem 0;
    color: var(--dark-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

nav a i {
    margin-right: 8px;
}

/* Hero Section */
#hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4rem 0;
    gap: 2rem;
}

.hero-content {
    flex: 1;
}

.hero-content h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #555;
}

.hero-image {
    flex: 1;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* Search Section */
#search {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
}

#search h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-align: center;
}

.search-box {
    display: flex;
    gap: 10px;
    max-width: 800px;
    margin: 0 auto;
}

.search-box input {
    flex: 3;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.search-box select {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    background-color: white;
}

/* Results Section */
#results {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    min-height: 300px;
    margin-bottom: 2rem;
}

.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.lesson-content {
    display: none;
}

#lesson-title {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

#lesson-materials {
    margin-bottom: 2rem;
}

#lesson-materials h4 {
    margin: 1.5rem 0 1rem;
    color: var(--secondary-color);
}

#lesson-materials ul, #lesson-materials ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

#lesson-materials p {
    margin-bottom: 1rem;
}

.actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

/* Features Section */
#features {
    padding: 3rem 0;
    text-align: center;
}

#features h2 {
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    text-decoration: none;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* Footer */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer p {
    margin-bottom: 1rem;
}

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

.social-links a {
    color: white;
    font-size: 1.2rem;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--accent-color);
}

/* Responsividade */
@media (max-width: 768px) {
    #hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-image {
        order: -1;
        margin-bottom: 2rem;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    nav ul {
        flex-wrap: wrap;
    }
    
    nav li {
        margin: 0 10px;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .actions button {
        width: 100%;
    }
}

/* Classes utilitárias */
.hidden {
    display: none !important;
}