body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f0f2f5;
    min-height: 100vh;
}

.header-section {
    padding: 40px 20px;
    text-align: center;
    width: 100%;
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 10;
}

h2 { color: #333; margin-bottom: 10px; }

.description {
    color: #666;
    margin-bottom: 25px;
    font-size: 15px;
    line-height: 1.5;
}

.notice {
    color: #d9534f;
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 25px;
}

.input-group {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

input {
    padding: 12px 15px;
    width: 280px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.3s;
}

input:focus { border-color: #007bff; }

button {
    padding: 12px 25px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    font-weight: bold;
}

button:hover { background: #0056b3; }

#result {
    margin-top: 20px;
    font-size: 20px;
    font-weight: bold;
    color: #d9534f;
    min-height: 30px;
}

.image-section {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 20px 0;
}

.fixed-image {
    width: 60vw;
    height: auto;
    max-height: 60vh;
    object-fit: contain;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    background-color: #fff;
}