body {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", sans-serif;
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: #ffffff;
    width: 600px;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

h1 {
    text-align: center;
    margin-bottom: 5px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 20px;
}

textarea {
    width: 100%;
    height: 120px;
    padding: 12px;
    font-size: 14px;
    border-radius: 8px;
    border: 1px solid #ccc;
    resize: none;
    box-sizing: border-box;
}

button {
    width: 100%;
    margin-top: 15px;
    padding: 12px;
    background: #4facfe;
    border: none;
    color: white;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
}

button:hover {
    background: #00c6fb;
}

.result-box {
    margin-top: 25px;
    padding: 15px;
    background: #f7f9fc;
    border-radius: 8px;
}

#resultText {
    margin-top: 10px;
    color: #333;
    white-space: pre-wrap;
}