* {
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', Arial, sans-serif;
    background: linear-gradient(135deg, #f4f7fa 0%, #e0e5ec 100%);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.generator-container {
    width: 100%;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.generator-box {
    background: #ffffff;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 450px;
    transition: all 0.3s ease;
    text-align: center;
}

.generator-box:hover {
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

h2 {
    color: #333;
    text-align: center;
    margin-bottom: 30px;
    font-size: 26px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

h2 i {
    margin-right: 8px;
    color: #3498db;
}

.form-group {
    margin-bottom: 22px;
    position: relative;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
    font-size: 15px;
}

label i {
    margin-right: 6px;
    color: #3498db;
}

input[type="text"],
input[type="tel"] {
    width: 100%;
    padding: 16px 18px;
    border: 2px solid #e0e5ec;
    border-radius: 12px;
    background: #f8fafc;
    font-size: 16px;
    color: #333;
    transition: all 0.3s ease;
}

input[type="text"]:focus,
input[type="tel"]:focus {
    outline: none;
    border-color: #3498db;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.1);
}

/* 单选框样式 */
.mode-select {
    margin-bottom: 25px;
}

.radio-group {
    display: flex;
    gap: 12px;
}

.radio-label {
    flex: 1;
    cursor: pointer;
    margin: 0;
}

.radio-label input[type="radio"] {
    display: none;
}

.radio-label span {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 14px;
    border: 2px solid #e0e5ec;
    border-radius: 12px;
    background: #f8fafc;
    font-size: 14px;
    color: #666;
    transition: all 0.3s ease;
    gap: 6px;
}

.radio-label input[type="radio"]:checked + span {
    border-color: #3498db;
    background: #ebf5fb;
    color: #2980b9;
    font-weight: 600;
}

.radio-label span i {
    margin: 0;
}

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    border-radius: 12px;
    font-size: 17px;
    font-weight: 600;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    width: 100%;
    margin: 6px 0;
}

button i {
    margin-right: 8px;
}

button[type="submit"] {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    box-shadow: 0 8px 20px rgba(52, 152, 219, 0.35);
}

button[type="submit"]:hover {
    background: linear-gradient(135deg, #2980b9 0%, #3498db 100%);
    box-shadow: 0 12px 25px rgba(52, 152, 219, 0.45);
    transform: translateY(-2px);
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.download-btn {
    background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
    box-shadow: 0 8px 20px rgba(46, 204, 113, 0.35);
}

.download-btn:hover {
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
    box-shadow: 0 12px 25px rgba(46, 204, 113, 0.45);
    transform: translateY(-2px);
}

.reset-btn {
    background: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
    box-shadow: 0 8px 20px rgba(149, 165, 166, 0.35);
}

.reset-btn:hover {
    background: linear-gradient(135deg, #7f8c8d 0%, #95a5a6 100%);
    box-shadow: 0 12px 25px rgba(149, 165, 166, 0.45);
    transform: translateY(-2px);
}

/* 结果页 */
#qrcode {
    margin: 20px auto;
    padding: 20px;
    background: #fff;
    border-radius: 16px;
    display: inline-block;
    border: 2px dashed #3498db;
}

#qrcode img {
    display: block;
    margin: 0 auto;
}

.hint {
    color: #666;
    font-size: 14px;
    margin: 15px 0 5px;
    line-height: 1.5;
}

.hint i {
    color: #e74c3c;
    margin-right: 4px;
}

.error-message {
    color: #e74c3c;
    font-size: 13px;
    display: block;
    margin-top: 6px;
}

/* 响应式 */
@media (max-width: 480px) {
    .generator-box {
        padding: 25px 20px;
    }
    h2 {
        font-size: 22px;
    }
    input, button {
        font-size: 15px;
    }
    .radio-label span {
        font-size: 13px;
        padding: 12px 8px;
    }
    .button-group {
        flex-direction: column;
        gap: 8px;
    }
}