* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f4f6f8;
    color: #222;
}

.container {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    margin-bottom: 8px;
}

.subtitle {
    color: #555;
}

.card {
    background: white;
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    margin-bottom: 24px;
}

h2 {
    margin-top: 0;
}

textarea {
    width: 100%;
    min-height: 140px;
    padding: 12px;
    margin-top: 8px;
    font-size: 14px;
}

input {
    width: 100%;
    padding: 12px;
    margin-top: 8px;
    font-size: 14px;
}

button {
    margin-top: 12px;
    padding: 10px 16px;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background: #1e4ed8;
}

.answer {
    white-space: pre-wrap;
    line-height: 1.6;
    margin-top: 12px;
}

.timing {
    margin-top: 8px;
    font-size: 13px;
    color: #555;
}

.sources {
    margin-top: 12px;
    padding-left: 20px;
}

.sources li {
    margin-bottom: 8px;
    font-size: 14px;
}