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

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    min-height: 100vh;
}

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

.login-box {
    width: 400px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    padding: 40px;
}

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

.login-header h1 {
    color: #1e3c72;
    font-size: 28px;
    margin-bottom: 10px;
}

.login-header p {
    color: #666;
    font-size: 14px;
}

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

.input-group-addon {
    background: #1e3c72;
    color: #fff;
    border: none;
    border-radius: 4px 0 0 4px;
    padding: 10px 12px;
}

.form-control {
    border: 1px solid #ddd;
    border-radius: 0 4px 4px 0;
    padding: 10px 12px;
    height: auto;
}

.form-control:focus {
    border-color: #1e3c72;
    box-shadow: none;
}

.btn-primary {
    background: #1e3c72;
    border: none;
    padding: 12px;
    font-size: 16px;
    border-radius: 4px;
    transition: all 0.3s;
}

.btn-primary:hover {
    background: #2a5298;
}

.login-footer {
    margin-top: 20px;
    text-align: center;
    color: #999;
    font-size: 12px;
}

.alert {
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}