/* Global Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #fdfbf7;
    /* Cream background */
    color: #1a2f26;
    /* Dark text */
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background-color: #ffffff;
    /* White container */
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    min-height: 80vh;
}

/* Header & Navigation */
header {
    background-color: #3eb489;
    /* Mint Green */
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
    border-radius: 0 0 8px 8px;
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 600;
    color: #ffffff;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 15px;
}

nav a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

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

nav a.active {
    background-color: rgba(255, 255, 255, 0.3);
}

/* Headings */
h1,
h2,
h3 {
    color: #2e8b57;
    /* Darker green for headings */
}

h2 {
    border-bottom: 2px solid #3eb489;
    padding-bottom: 0.5rem;
    margin-top: 2rem;
}

/* Links */
a {
    color: #2e8b57;
}

/* Visual Elements */
.analysis-img {
    max-width: 100%;
    height: auto;
    border: 2px dashed #3eb489;
    margin: 20px 0;
    display: block;
    background-color: #f9f9f9;
    padding: 10px;
}

/* Buttons */
.btn-next {
    display: inline-block;
    background-color: #3eb489;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 2rem;
    font-weight: bold;
    transition: background-color 0.2s;
}

.btn-next:hover {
    background-color: #2e8b57;
}

/* Flashcards */
.flashcard-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.flashcard {
    background-color: #e0f5e9;
    /* Light green card */
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: transform 0.2s, background-color 0.2s;
    border: 1px solid #3eb489;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.flashcard:hover {
    transform: translateY(-2px);
    background-color: #d1e8dc;
}

.flashcard .question {
    color: #1a2f26;
    font-weight: 500;
}

.flashcard .answer {
    display: none;
    margin-top: 10px;
    font-weight: bold;
    color: #2e8b57;
}

.flashcard.revealed .answer {
    display: block;
}

.flashcard.revealed .question {
    font-size: 0.9em;
    color: #555;
}

/* Works Cited */
.citation {
    margin-bottom: 1rem;
    padding-left: 1rem;
    border-left: 3px solid #3eb489;
    background-color: #f0fdf7;
    padding: 10px;
    border-radius: 0 4px 4px 0;
    overflow-wrap: break-word;
    word-break: break-word;
}

/* Responsive (Minimal adjustments for 'chill' layout) */
@media (max-width: 600px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    nav ul {
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #3eb489 0%, #2e8b57 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
    border-radius: 0 0 20px 20px;
    margin-bottom: 3rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.hero h1 {
    color: white;
    font-size: 3rem;
    margin: 0 0 1rem 0;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
}

/* Topic Grid */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.topic-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #eee;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border-color: #3eb489;
}

.topic-card h3 {
    color: #2e8b57;
    margin-top: 0;
    font-size: 1.5rem;
}

.topic-card p {
    color: #555;
    flex-grow: 1;
    margin-bottom: 1.5rem;
}

.btn-card {
    display: inline-block;
    padding: 10px 25px;
    background-color: #3eb489;
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: background-color 0.2s;
}

.btn-card:hover {
    background-color: #2e8b57;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 4rem;
    padding: 2rem;
    color: #666;
    border-top: 1px solid #eee;
}

footer a {
    color: #3eb489;
    text-decoration: none;
}