/* 登录页面样式 */
.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #fff 100%);
    display: flex;
    align-items: center;
}

.login-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.login-header {
    background: #084298;
    color: white;
    padding: 2rem;
    text-align: center;
}

.login-body {
    padding: 2rem;
}

/* 表单控件焦点样式 */
.form-control:focus {
    border-color: #764ba2;
    box-shadow: 0 0 0 0.2rem rgba(118, 75, 162, 0.25);
}

/* 登录按钮样式 */
.btn-login {
    background: #084298;
    border: none;
    padding: 0.75rem;
    transition: background-color 0.3s ease;
}

.btn-login:hover {
    background: #667eea;
}

.btn-login:disabled {
    background: #6c757d;
    cursor: not-allowed;
}

/* 错误消息样式 */
.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-card {
        margin: 1rem;
    }
    
    .login-header {
        padding: 1.5rem;
    }
    
    .login-header h2 {
        font-size: 1.5rem;
    }
}

/* 加载动画 */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* 辅助类 */
.d-none {
    display: none !important;
}

.text-muted {
    color: #6c757d !important;
}

.text-center {
    text-align: center !important;
}