* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: #f5f7fa;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 500px;
}

.card {
    background: #fff;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

h2 {
    text-align: center;
    margin-bottom: 24px;
    color: #222;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 16px;
    margin-bottom: 16px;
    outline: none;
}

.input-group input:focus {
    border-color: #409eff;
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: #409eff;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
}

.btn-primary:disabled {
    background: #a0cfff;
    cursor: not-allowed;
}

.result-box {
    margin-top: 20px;
}

.info-item {
    padding: 10px 0;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.copy-btn {
    background: #f5f5f5;
    border: 1px solid #ddd;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
}

.btn-code {
    width: 100%;
    padding: 12px;
    background: #67c23a;
    color: white;
    border: none;
    border-radius: 10px;
    margin-top: 10px;
    cursor: pointer;
}

.code-show {
    margin-top: 10px;
    padding: 10px;
    background: #f0f9ff;
    border-radius: 8px;
    text-align: center;
    font-size: 18px;
}

.msg {
    margin-top: 16px;
    text-align: center;
    color: #f56c6c;
    font-size: 14px;
}