:root {
    /* Color Palette - Didactic, Clean, Elegant */
    --primary-color: #2c3e50; /* Deep Blue */
    --accent-color: #1abc9c; /* Teal/Green - Calming, Educational */
    --bg-color: #fdfbf7; /* Off-white/Cream - Easier on eyes for reading */
    --text-color: #333333;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.08);
    --font-main: 'Outfit', 'Inter', sans-serif;
    --font-reading: 'Merriweather', serif; /* Better for long text */
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease;
}

a {
    text-decoration: none;
    color: inherit;
}

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

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

/* Card Style */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 20px;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 8px;
    font-weight: 500;
    transition: background 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #16a085;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Header */
header {
    background: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Reader View */
.reader-container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.reader-content {
    font-family: var(--font-reading);
    font-size: 1.125rem;
    line-height: 1.8;
}

/* Floating Action Button */
.fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    cursor: pointer;
    color: white;
    font-size: 24px;
    transition: transform 0.2s;
}

.fab:hover {
    transform: scale(1.1);
}

/* Responsive */
@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
    }
    .reader-container {
        padding: 20px;
    }
}