body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-panel {
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 400px;
    max-width: 90%;
}

.login-panel h2 {
    text-align: center;
    color: #333;
    margin-bottom: 5px;
    font-size: 24px;
}

.login-panel .subtitle {
    text-align: center;
    color: #999;
    margin-bottom: 30px;
    font-size: 14px;
}

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

.login-panel .form-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-size: 14px;
}

.login-panel .form-control {
    height: 40px;
    border-radius: 5px;
    border: 1px solid #ddd;
    padding: 6px 12px;
    font-size: 14px;
}

.login-panel .form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 5px rgba(102,126,234,0.3);
}

.login-panel .btn-primary {
    width: 100%;
    height: 42px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 5px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
}

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

.login-tip {
    margin-top: 15px;
    text-align: center;
    color: #999;
    font-size: 12px;
}

.text-danger {
    color: #d9534f;
    text-align: center;
    display: block;
    margin-top: 10px;
}