:root {
    --primary-color: #4a69bd;
    --background-color: #f4f7f9;
    --card-background: #ffffff;
    --text-color: #333333;
    --heading-color: #2c3e50;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    text-align: center;
    padding: 4rem 1rem 2rem;
    background-color: var(--card-background);
}

header h1 {
    color: var(--heading-color);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    color: #7f8c8d;
}

main {
    padding: 2rem 1rem;
}

.card-link {
    text-decoration: none;
    color: inherit;
    display: flex; /* Ensure the link takes up the full grid cell space */
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background-color: var(--card-background);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s forwards;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

.card-link:hover .card {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

.card-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 1.5rem;
}

.card h2 {
    color: var(--heading-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.card p {
    font-size: 1rem;
    flex-grow: 1;
}

/* New styles for individual quiz pages */
.quiz-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem 2.5rem;
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.quiz-form hr {
    margin: 2rem 0;
    border: 0;
    border-top: 1px solid #eee;
}

.quiz-form .form-group {
    margin-bottom: 1rem;
}

.quiz-form label {
    font-weight: 600;
    margin-right: 0.5rem;
}

.quiz-form input[type="text"],
.quiz-form input[type="email"] {
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    width: 250px;
}

.question {
    margin-bottom: 2rem;
    padding-left: 1rem;
    border-left: 3px solid var(--primary-color);
}

.question p {
    font-weight: 600;
    margin-bottom: 1rem;
}

.question label {
    display: block;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: color 0.2s;
    font-weight: 400;
}

.question label:hover {
    color: var(--primary-color);
}

.question input[type="radio"] {
    margin-right: 0.5rem;
}

.submit-button {
    display: block;
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 2rem;
}

.submit-button:hover {
    background-color: #3a539b;
}

.quiz-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    margin-top: 1rem;
    flex-grow: 1;
}

.quiz-button {
    display: block;
    padding: 0.75rem 1rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
    font-weight: 600;
}

.quiz-button:hover {
    background-color: #3a539b; /* A darker shade of primary */
}

/* Quiz Index Page Styles */
.quiz-index-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.quiz-index-container h1 {
    color: var(--heading-color);
    text-align: center;
    margin-bottom: 2rem;
}

.quiz-index-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.home-link {
    display: block;
    text-align: center;
    margin-top: 2rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.home-link:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 2rem;
    color: #7f8c8d;
    font-size: 0.9rem;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Staggered animation delay */
.grid-container > *:nth-child(1) { animation-delay: 0.1s; }
.grid-container > *:nth-child(2) { animation-delay: 0.2s; }
.grid-container > *:nth-child(3) { animation-delay: 0.3s; }
.grid-container > *:nth-child(4) { animation-delay: 0.4s; }
.grid-container > *:nth-child(5) { animation-delay: 0.5s; }
.grid-container > *:nth-child(6) { animation-delay: 0.6s; }

/* The animation is on the card, which is a child of the grid item now for the linked card */
.grid-container > *:nth-child(1) .card { animation-delay: 0.1s; }