/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Header and Navigation */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav h1 a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links a {
    color: white;
    text-decoration: none;
    margin-left: 1.5rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-links a:hover {
    background-color: rgba(255,255,255,0.2);
}

/* Main content */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    min-height: calc(100vh - 200px);
}

/* Homepage styles */
h1 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

h2 {
    color: #34495e;
    margin: 2rem 0 1rem 0;
    font-size: 1.8rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
}

h3 {
    color: #34495e;
    margin: 1.5rem 0 0.5rem 0;
    font-size: 1.3rem;
}

p {
    margin-bottom: 1rem;
    text-align: justify;
}

/* Lesson links */
a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Lesson navigation */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2rem 0;
    padding: 1rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-btn {
    padding: 0.7rem 1.2rem;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.nav-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.nav-btn.home {
    background: #27ae60;
}

.nav-btn.home:hover {
    background: #229954;
}

/* Lesson content */
.lesson {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

.lesson-content {
    padding: 2rem;
}

/* Lists */
ul, ol {
    margin: 1rem 0 1rem 2rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Code and emphasis */
code {
    background: #f1f2f6;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
}

strong {
    color: #2c3e50;
}

em {
    color: #e74c3c;
    font-style: italic;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: white;
}

th, td {
    border: 1px solid #ddd;
    padding: 0.7rem;
    text-align: left;
}

th {
    background: #f8f9fa;
    font-weight: bold;
    color: #2c3e50;
}

/* Blockquotes */
blockquote {
    border-left: 4px solid #3498db;
    margin: 1rem 0;
    padding: 1rem 1.5rem;
    background: #f8f9fa;
    font-style: italic;
}

/* Footer */
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

/* Responsive design */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        display: flex;
        gap: 1rem;
    }

    .nav-links a {
        margin-left: 0;
    }

    main {
        padding: 0 1rem;
    }

    .lesson-nav {
        flex-direction: column;
        text-align: center;
    }

    .nav-btn {
        width: 100%;
        justify-content: center;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }
}

/* Special formatting for Spanish content */
.conjugation {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 1rem;
    margin: 1rem 0;
}

.verb-example {
    font-weight: bold;
    color: #e74c3c;
}

.translation {
    color: #6c757d;
    font-style: italic;
}