body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(to right, #eef2f3, #8e9eab);
    margin: 0;
    padding: 0;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 40px auto;
    background: #fff;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    font-size: 2.5rem;
    color: #1f3c88;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 30px;
}

.input-section label {
    display: block;
    margin-top: 15px;
    font-weight: 600;
}

.input-section input,
.input-section select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
}

button {
    margin-top: 20px;
    padding: 12px 20px;
    background-color: #1f3c88;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #16306b;
}

.output {
    margin-top: 30px;
    background: #e8f4fc;
    padding: 15px;
    border-left: 5px solid #1f3c88;
    font-size: 1.1rem;
    border-radius: 8px;
}

canvas {
    margin-top: 30px;
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid #ccc;
    background-color: #fff;
    border-radius: 8px;
}

.explanation {
    margin-top: 40px;
    background: #fefefe;
    border-left: 5px solid #e29578;
    padding: 20px;
    border-radius: 8px;
}

.explanation h2 {
    color: #d76c57;
    margin-top: 0;
}

.explanation ul {
    padding-left: 20px;
}

.explanation li {
    margin-bottom: 8px;
}