* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../img/bg.jpg') no-repeat center center fixed;
    background-size: cover;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.register-card {
    background: rgba(0, 0, 0, 0.8);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
}

.logo {
    text-align: center;
    margin-bottom: 20px;
}

.logo h1 {
    font-size: 24px;
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #444;
    border-radius: 5px;
    background: rgba(50, 50, 50, 0.8);
    color: white;
    font-size: 16px;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: #ffd700;
    box-shadow: 0 0 5px rgba(255, 215, 0, 0.5);
}

.gender-group {
    display: flex;
    gap: 15px;
}

.gender-option {
    flex: 1;
    text-align: center;
}

.gender-option input {
    width: auto;
    margin-right: 5px;
}

.btn-register {
    width: 100%;
    padding: 12px;
    background: linear-gradient(to right, #ff8c00, #ffd700);
    border: none;
    border-radius: 5px;
    color: #000;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 215, 0, 0.4);
}

.captcha-container {
    display: flex;
    gap: 10px;
    align-items: center;
}

.captcha-container img {
    height: 40px;
    border: 1px solid #444;
    border-radius: 5px;
    cursor: pointer;
    border: 1px solid #444;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
}

.captcha-container input {
    flex: 1;
    padding: 10px;
    font-size: 16px;
}

.back-link {
    text-align: center;
    margin-top: 20px;
}

.back-link a {
    color: #ffd700;
    text-decoration: none;
}

.back-link a:hover {
    text-decoration: underline;
}

@media (max-width: 480px) {
    .register-card {
        padding: 20px;
    }
    
    .logo h1 {
        font-size: 20px;
    }
    
    .gender-group {
        flex-direction: column;
        gap: 10px;
    }
}

.error-message {
    color: #ff4444;
    font-size: 14px;
    margin-top: 5px;
}

.success-message {
    color: #44ff44;
    text-align: center;
    margin-bottom: 15px;
}