:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --background-color: #f0f2f5;
    --text-color: #333;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --font-family: 'Poppins', sans-serif;
}

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

header {
    width: 100%;
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 2px 2px 4px var(--shadow-color);
}

main {
    width: 100%;
    max-width: 800px;
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px var(--shadow-color);
}

#setup-container, #test-container, #results-container {
    padding: 2rem;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.option {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-weight: 600;
}

select, input[type="text"] {
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 1rem;
    transition: all 0.3s ease;
}

select:focus, input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.5);
}

#topics-checkboxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

button {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    display: block;
    width: 100%;
    margin-top: 1rem;
}

button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

button:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
    transform: none;
}

.hidden {
    display: none;
}

.test-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

#timer {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.test-controls {
    display: flex;
    gap: 1rem;
}

#test-paper {
    display: grid;
    gap: 1.5rem;
}

.question {
    background-color: #f9f9f9;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-color);
}

#results-summary {
    text-align: center;
    font-size: 1.5rem;
}

#feedback-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

#feedback-section h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 1.5rem;
}

#feedback-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

input[type="email"],
textarea {
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all 0.3s ease;
}

input[type="email"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.5);
}

#feedback-form button {
    background-color: var(--secondary-color);
}

#feedback-form button:hover {
    background-color: #27ae60;
}

#feedback-status {
    margin-top: 1rem;
    text-align: center;
    font-weight: 600;
}