body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f7f9fb;
    color: #222;
    margin: 0;
    padding: 0;
}
header {
    background: linear-gradient(90deg, #6a82fb 0%, #fc5c7d 100%);
    color: #fff;
    padding: 2rem 1rem 1rem 1rem;
    text-align: center;
}
main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 1rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}
section {
    margin-bottom: 2.5rem;
}
h2 {
    color: #6a82fb;
    margin-bottom: 0.5rem;
}
#upload-section input[type="file"] {
    margin-bottom: 0.5rem;
}
button {
    background: #6a82fb;
    color: #fff;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}
button:hover {
    background: #fc5c7d;
}
#summary-output, #quiz-output, #reminder-output, #progress-output {
    background: #f0f4fa;
    border-radius: 8px;
    padding: 1rem;
    min-height: 60px;
    margin-top: 0.5rem;
}
footer {
    text-align: center;
    padding: 1rem;
    background: #f0f4fa;
    color: #888;
    border-top: 1px solid #e0e0e0;
    margin-top: 2rem;
}