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

body {
    font-family: "Microsoft YaHei", Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.login-box {
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    padding: 30px 20px;
    text-align: center;
}

.login-logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 15px;
}

.login-title {
    color: #ffffff;
    font-size: 22px;
    font-weight: bold;
}

.login-form {
    padding: 40px 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-size: 14px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #2196f3;
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    color: #ffffff;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(33, 150, 243, 0.4);
}

.btn-login:active {
    transform: translateY(0);
}

.message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 5px;
    font-size: 14px;
    text-align: center;
    display: none;
}

.message.error {
    background-color: #ffebee;
    color: #c62828;
    display: block;
}

.message.success {
    background-color: #e8f5e9;
    color: #2e7d32;
    display: block;
}

@media screen and (max-width: 480px) {
    .login-container {
        padding: 15px;
    }

    .login-header {
        padding: 25px 15px;
    }

    .login-logo {
        width: 60px;
        height: 60px;
    }

    .login-title {
        font-size: 18px;
    }

    .login-form {
        padding: 30px 20px;
    }
}