/* Base Styles */
:root {
    --primary-color: #3a2f2f;
    --secondary-color: #f9f5e9;
    --accent-color: #8b6b4a;
    --text-color: #333;
    --light-text: #f9f5e9;
    --border-color: #ddd;
    --shadow-color: rgba(0,0,0,0.1);
    --transition-speed: 0.5s;
}

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

body {
    font-family: 'Georgia', serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--secondary-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

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

header {
    text-align: center;
    padding: 40px 0;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--accent-color);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.subtitle {
    font-style: italic;
    font-size: 1.2rem;
    color: var(--accent-color);
}

/* Timeline Navigation */
.period-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.period-btn {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: var(--light-text);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.period-btn:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
}

/* PDF Downloads Section */
.pdf-downloads {
    background-color: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    box-shadow: 0 4px 8px var(--shadow-color);
}

.pdf-downloads h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    text-align: center;
}

.pdf-downloads p {
    text-align: center;
    margin-bottom: 15px;
}

.download-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.download-btn {
    display: inline-block;
    padding: 8px 12px;
    background-color: var(--accent-color);
    color: var(--light-text);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.download-btn:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px var(--shadow-color);
}

/* Period Content */
.period-content {
    display: none;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px var(--shadow-color);
    margin-bottom: 30px;
}

.period-content.active {
    display: block;
    animation: fadeIn 0.8s ease;
}

.period-content h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    text-align: center;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.period-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .period-info {
        grid-template-columns: repeat(2, 1fr);
    }
}

.historical-context, .characteristics, .authors, .featured-work {
    padding: 15px;
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: 5px;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.period-info h3 {
    color: var(--accent-color);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.period-info ul {
    padding-left: 20px;
    margin-bottom: 10px;
}

.period-info li {
    margin-bottom: 5px;
}

/* Featured Work */
.work-sample {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 15px;
    border-radius: 5px;
    margin-top: 10px;
}

.original-text {
    font-style: italic;
    margin-bottom: 10px;
}

.toggle-btn {
    background-color: var(--accent-color);
    color: var(--light-text);
    border: none;
    padding: 5px 10px;
    border-radius: 3px;
    cursor: pointer;
    margin: 10px 0;
    transition: background-color 0.3s ease;
}

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

.translation {
    padding: 10px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 5px;
    margin-top: 10px;
}

.hidden {
    display: none;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--accent-color);
}

/* Period-specific styles */
/* Old English */
body.old-english {
    --primary-color: #3a2f2f;
    --accent-color: #8b6b4a;
    background-color: #f9f5e9;
}

/* Middle English */
body.middle-english {
    --primary-color: #4a3c2a;
    --accent-color: #8b7d4a;
    background-color: #f5f0e0;
}

/* Renaissance */
body.renaissance {
    --primary-color: #2a3c4a;
    --accent-color: #4a7d8b;
    background-color: #e8f0f5;
}

/* Neoclassical */
body.neoclassical {
    --primary-color: #4a2a3c;
    --accent-color: #8b4a7d;
    background-color: #f5e8f0;
}

/* Romantic */
body.romantic {
    --primary-color: #2a4a3c;
    --accent-color: #4a8b7d;
    background-color: #e8f5f0;
}

/* Victorian */
body.victorian {
    --primary-color: #3c2a4a;
    --accent-color: #7d4a8b;
    background-color: #f0e8f5;
}

/* Modern */
body.modern {
    --primary-color: #1a5e2a;
    --accent-color: #3a8b4a;
    background-color: #e8f5e8;
}

/* Post-modern */
body.postmodern {
    --primary-color: #4a1a5e;
    --accent-color: #6a3a8b;
    background-color: #f0e8f5;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .period-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    .period-content {
        padding: 15px;
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}