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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-box {
    background: #fff;
    border-radius: 12px;
    padding: 40px 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 24px;
    color: #333;
    margin-bottom: 8px;
}

.login-header p {
    font-size: 14px;
    color: #999;
}

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

.login-form label {
    display: block;
    font-size: 14px;
    color: #555;
    margin-bottom: 8px;
}

.login-form input {
    width: 100%;
    height: 44px;
    padding: 0 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.login-form input:focus {
    outline: none;
    border-color: #667eea;
}

.btn-login {
    width: 100%;
    height: 46px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: opacity 0.3s;
}

.btn-login:hover {
    opacity: 0.9;
}

.login-tip {
    margin-top: 20px;
    text-align: center;
}

.login-tip p {
    font-size: 12px;
    color: #999;
}

@media (max-width: 480px) {
    .login-box {
        padding: 30px 20px;
    }
    .login-header h1 {
        font-size: 20px;
    }
}